https://www.revistascca.unam.mx/atm/index.php/atm/issue/feed Atmósfera 2023-10-31T05:59:58+00:00 Graciela B. Raga editora@atmosfera.unam.mx Open Journal Systems <h3>Focus and Scope</h3> <p dir="ltr">Atmosfera is an international, peer-reviewed journal published quarterly from 1988 to 2022. As of 2023, the manuscripts are published according to the continuous publication model. This journal is devoted to original research in the atmospheric sciences, climate change, interactions with the hydrosphere, cryosphere, biosphere and human systems. </p> <p>It is published by the Universidad Nacional Autónoma de México, through the Instituto de Ciencias de la Atmósfera y Cambio Climático.</p> <p>All papers published are Open Access for readers and there are no publication fees for authors. The journal is indexed in Scopus, SCimago, Science Citation Index, LatinIndex, SciELO, among other databases. It has continuously increased its visibility and impact, with an Impact Factor of 1.4 (2023), as determined by the Journal Citation Report (Clarivate/ Web of Science).</p> <!-- WIDGET SCImago - Open Access --> <p><a title="SCImago Journal &amp; Country Rank" href="https://www.scimagojr.com/journalsearch.php?q=12079&amp;tip=sid&amp;exact=no"><img src="https://www.scimagojr.com/journal_img.php?id=12079" alt="SCImago Journal &amp; Country Rank" border="0" /></a> <img style="float: right; width: 256px; height: 93px;" src="https://opinion.atmosfera.unam.mx/wp-content/uploads/2021/02/openaccess.jpg" alt="Atmósfera - CCA UNAM" /></p> <!-- WIDGET SCImago - Open Access --> https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53272 Trend analysis and forecast of annual precipitation and temperature series in the Eastern Mediterranean region 2023-10-31T05:59:58+00:00 Vasileios D. Sakalis vsakalis@hotmail.com <p class="p1">The present study aims to examine the current trend of annual precipitation and temperature series referred to the Eastern Mediterranean basin on a national basis, including the annual variability of sea surface temperature anomalies and the connection effect with the North Atlantic Oscillation and the Mediterranean Oscillation indices (NAOI and MOI, respectively). The period under consideration is mainly the last 32 years, from 1990 to 2021. Additionally, the prediction of monthly and yearly temperature and precipitation series, based on the autoregressive integrated moving average model on a national base, for the next four or eight years, is another interesting feature of the present study. Results indicate rising trends in the annual precipitation during 1990-2021, mostly non-significant and significant warming trends in the annual temperature, including sea surface temperature. The NAOI is highly correlated mostly with annual temperature, whereas the MOI does not affect the variation of annual precipitation and temperature. The results of the present study are in general agreement with the results of available studies in the literature, and they could be of high interest to national authorities and environmental unions/organizations, to help decision-makers face climate change.</p> 2024-02-15T00:00:00+00:00 Copyright (c) 2024 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53270 Carbonaceous particles and PM2.5 optical properties in Mexico City during the ACU15 campaign 2023-08-01T20:50:58+00:00 Naxieli Santiago-de la Rosa naxieli1@hotmail.com Cristina Prieto cprieto@atmosfera.unam.mx Ruben Pavia www.ruben6@gmail.com Oscar Peralta oscar@atmosfera.unam.mx Harry Alvarez-Ospina halvarez@atmosfera.unam.mx Isabel Saavedra sisabel@atmosfera.unam.mx Telma Castro telma@atmosfera.unam.mx Rocío García gmrocio@atmosfera.unam.mx María de la Luz Espinosa marilu@atmosfera.unam.mx Abraham Ortinez-Alvarez abraham@atmosfera.unam.mx Gerardo Ruíz-Suárez ruizs@atmosfera.unam.mx Amparo Martínez-Arroyo amparo@atmosfera.unam.mx <p class="p1">We measured the optical properties of aerosols with two photoacoustic spectrometers operating at 532 and 870 nm wavelengths and sampled PM<sub>2.5</sub> to analyze the organic carbon (OC) and elemental carbon (EC) content. The measuring site was in the southwest corner of Mexico City. We sorted the data by OC/EC ratios and calculated four mass absorption efficiencies (MAEs) for each wavelength with linear regressions. The MAEs ranged from 2.27 to 19.75 and 2.03 to 15.26 m<sup>2</sup> g<sup>–1</sup> at 532 and 870 nm, respectively, with determination coefficients above 0.88, showing that the amount of OC modifies the absorption properties of particles, sometimes underestimating or overestimating the black carbon concentration. It is possible to choose the MAE based on the daily median O<sub>3</sub> concentration when there is no information about the EC and OC composition.</p> 2024-01-24T00:00:00+00:00 Copyright (c) 2024 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53282 Solar PV technologies selection for the design of photovoltaic installations in Mexico based on the analysis of meteorological satellite data from the region 2023-08-18T20:44:30+00:00 Ricardo Miranda-Jiménez mirandaryckardo@gmail.com Osvaldo Vigil-Galán ovigil46gg@yahoo.com.mx Jesús Roberto González-Castillo g_c_j_r@hotmail.com Ángel Refugio Terán-Cuevas angelteran.smn@gmail.com María Eugenia Gutiérrez-Castillo ainegue9@gmail.com Luis Raúl Tovar-Gálvez ltovarg@ipn.mx <p class="p1">Mexico’s expansive territory spans diverse climatic conditions, which directly influences the selection of commercial photovoltaic technologies. This study utilizes solar irradiance, temperature, and cloud index data (derived from satellite sources) to generate a suitability map for commercial solar panel technologies through the Analytical Hierarchy Process-Geographical Information Systems methodology. The map illustrates that chalcopyrites and cadmium telluride emerge as the most suitable technologies in 47.12% of the national territory. Following closely behind is amorphous silicon, covering 30.45%, while monocrystalline and polycrystalline silicon account for 22.43%. The primary objective of this paper is to guide the proper selection of solar panel technology types that align optimally with Mexico’s climatic conditions. This strategic approach aims to strengthen the planning and viability of photovoltaic solar energy projects nationwide.</p> 2023-12-08T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53265 Variability, cycles, and trends of mean air temperature north of Colombia 2023-06-23T20:14:04+00:00 Andrea Patricia Manrique-Cantillo apmanrique4@gmail.com Enrique de Jesús Morales-Acuña emoralesacu1980@gmail.com Jean Rogelio Linero-Cueto jlineroc@unimagdalena.edu.co <p class="p1">Climate variability is of global interest due to its socioeconomic and environmental effects on the world’s population. In Colombia, temperature changes affect food security, especially for the most vulnerable people in the Caribbean region. We analyzed monthly air temperature in northeastern Colombia (Cesar, La Guajira, and Magdalena departments). We reconstructed time series with missing data using nonlinear principal component analysis. Subsequently, temporal variability, associations with events of climatic variability, and temporal trends were evaluated. Periodicity analyses indicate the dominance of annual variability, although statistically significant associations with periods between 3 and 7 years show the influence of El Niño-Southern Oscillation (ENSO) events. The Spearman correlation coefficient with N = 360 and 95% significance shows a better association with the Multivariate ENSO Index (r<sub>sp mean</sub> = 0.38) and the Southern Oscillation Index (r<sub>sp mean</sub> = –0.32). The multi-year monthly analysis shows positive trends, with maximum values between March (1.04 ºC month<sup>–1</sup>), and June (1.07 ºC month<sup>–1</sup>) in the valley of the Cesar department, and a minimum in March, at the northernmost La Guajira (0.2 ºC month<sup>–1</sup>).</p> 2023-12-07T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53264 Exploring the academic perceptions of climate engineering in developing countries 2023-08-10T21:14:36+00:00 Athar Hussain ahq08@yahoo.com Hassaan F. K. Sipra hassaan.sipra@gmail.com Abdul Waheed abdul_waheed@comsats.edu.pk Kingsley E. Ukhurebor ukhurebor.kingsley@edouniversity.edu.ng <p class="p1">The idea of climate engineering still remains elusive, particularly in several of those developing countries that are most affected by climate change. This knowledge gap can be addressed by knowing the perception of climate change and then introducing and getting feedback on its modification via climate engineering, from the select group of developing countries. Building upon an earlier attempt to achieve these aims, a new group of three developing countries in the global South (Pakistan, Nigeria, and Kenya) is selected to examine their perspective via a total of more than 1000 responses. Descriptive and inferential results indicate that there are significant differences within the global South on awareness of global warming and climate engineering, as well as on the deployment of sulfate aerosols as a measure to delay the harshest effects of global warming.</p> 2023-11-21T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53211 Subsurface temperature change attributed to climate change at the northern latitude site of Kapuskasing, Canada 2023-06-19T20:14:30+00:00 Ivan L. Novara ivanlionelnovara@gmail.com Daniel B. Berdichevsky daniel.b.berdichevsky@nasa.gov Ruben D. Piacentini ruben.piacentini@gmail.com <p class="p1">Subsurface temperatures have been measured in different regions of the world, usually near the surface up to a depth of about a hundred meters. In this work a forward model calculation for a Northern Hemisphere soil temperature site at Kapuskasing, Canada, is presented, employing the solution of the differential equation of heat conduction through a semi-infinite homogeneous solid, subject to surface boundary conditions determined by surface air temperature. In this way, a detailed analysis is made of the subsurface temperature as a function of ground depth and for the time interval ranging from 1970 to the future (including the next century), for different scenarios of climate change. From these results, it was possible to determine the following characteristic quantities: (a) the depth where the surface perturbation (practically) finishes (in the range of about 180-200 m); (b) the depth where the subsurface temperature changes its slope from negative to positive; (c) the temperature change at the surface for the years where data exist; (d) the thermal gradient at steady state in the starting year (1880); (e) the temperature differences extrapolated at surface and at a 20 m depth, this last value corresponding to the depth at which seasonal and diurnal temperature variations are negligible; (f) the heat flow at surface to the inner part of the soil attributed to climate change, and (g) the temperature changes at surface for the 100 years interval (1980-2080) and mainly for the next century (2080-2180), for each site and for each IPCC Representative Concentration Pathway (RCP) scenario. As an example, the impact of the change in mean annual soil temperature due to global warming in near-surface geothermal energy is described.</p> 2023-11-13T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53277 Development of a CFD model to simulate the dispersion of atmospheric NH3 in a semi-open barn 2023-06-15T23:34:44+00:00 Guillermo Alfonso de la Torre-Gea indetec.ac@gmail.com <p class="p1">The dispersion of atmospheric NH<sub>3</sub> constitutes the most common passive polluting system in cattle stables. Although the studies carried out through computational fluid dynamics (CFD) are focused on improving the environmental conditions in situ to increase the productivity of stables, they do not refer to determining the environmental impact of NH<sub>3</sub> emissions into the atmosphere. This work evaluated the distribution of the NH<sub>3</sub> flux inside a barn using CFD and its relationship with environmental conditions through probabilistic analysis by the K2 algorithm. The initial data on environmental conditions were wind speed and direction, maximum temperature, and humidity from the nearest weather station in a region characterized by hot weather conditions during summer. The vertical trajectory was used to analyze the impact of long-range transport on the spatial distribution, where 75% is between 0 and 5 m in height, and 25% is between 10 and 20 m outside the eaves. The work concluded that temperature is the main parameter of influence.</p> 2023-11-03T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53258 Using a hybrid approach for wind power forecasting in Northwestern Mexico 2023-08-29T19:19:21+00:00 Yanet Diaz-Esteban yanet.diaz.esteban@gmail.com Carlos Alberto López-Villalobos calovi@atmosfera.unam.mx Carlos Abraham Ochoa Moya carlos.ochoa@atmosfera.unam.mx Rosario Romero-Centeno rosario@atmosfera.unam.mx Ignacio Arturo Quintanar arturo.quintanar@atmosfera.unam.mx <p class="p1">Wind energy is an important renewable source that has been considerably developed recently. In order to obtain successful 24-h lead-time wind power forecasts for operational and commercial uses, a combination of physical and statistical models is desirable. In this paper, a hybrid methodology that employs a numerical weather prediction model (Weather Research and Forecasting) and a neural network (NN) algorithm is proposed and assessed. The methodology is applied to a wind farm in northwestern Mexico, a region with high wind potential where complex geography adds large uncertainty to wind energy forecasts. The energy forecasts are then evaluated against actual on-site power generation over one year and compared with two reference models: decision trees (DT) and support vector regression (SVR). The proposed method exhibits a better performance with respect to the reference methods, showing an hourly normalized mean absolute percentage error of 6.97%, which represents 6 and 13 percentage points less error in wind power forecasts than with DT and SVR methods, respectively. Under strong synoptic forcing, the NN wind power forecast is not very accurate, and novel approaches such as hierarchical algorithms should be employed instead. Overall, the proposed model is capable of producing high-quality wind power forecasts for most weather conditions prevailing in this region and demonstrates a good performance with respect to similar models for medium-term wind power forecasts.</p> 2023-10-30T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53255 Performance evaluation of the WRF model under different physical schemes for air quality purposes in Buenos Aires, Argentina 2023-06-07T21:51:33+00:00 Solange E. Luque solange.luque@cima.fcen.uba.ar Lluís Fita lluis.fita@cima.fcen.uba.ar Andrea L. Pineda Rojas pineda@cima.fcen.uba.ar <p class="p1">This work presents the performance evaluation of the Weather Research and Forecasting (WRF) model to estimate surface wind speed and direction, air temperature, and water vapor mixing ratio considering 22 configurations at high spatial resolution (1 km) during one week in winter and one week in spring, in order to determine the best-performing schemes for air quality purposes in the Metropolitan Area of Buenos Aires, Argentina. Results show that the use of urban schemes mostly affects wind speed and temperature. The single-layer urban canopy model (UCM) coupled with the Boulac planetary boundary layer (PBL) scheme exhibits the best results for wind speed. Wind direction and water vapor mixing ratio are more sensitive to the land surface model scheme, with results slightly improving with the Noah-MP land surface model. Wind speed and direction errors are larger when the former is lower. When removing from the analysis wind speed values below 2.6 m s<sup>–1</sup> for the winter week and 3.1 m s<sup>–1</sup> for the spring week, the root mean square errors for wind direction decreased between 50 and 72% of the original value, depending on the configuration and week. Overall, under the studied conditions, configurations including Noah-Mp land surface model or the combination of a simple UCM with BouLac PBL are suitable for air quality applications, as they reproduce both temperature and water vapor mixing ratio relatively well, with errors below 10% and Correlation values above 0.7, and are the best performing configurations for wind direction and speed, respectively.</p> 2023-10-05T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53257 Atlantic and Pacific sea surface temperature correlations with precipitation over northern Mexico 2023-05-19T21:42:39+00:00 Regina Mijares-Fajardo regina.mijaresfo@udlap.mx René Lobato-Sánchez rene_lobato@tlaloc.imta.mx Carlos Patiño-Gómez carlos.patino@udlap.mx David Eduardo Guevara-Polo david.guevarapo@udlap.mx <p class="p1">Three main sea surface temperature (SST) oscillations in the Atlantic and Pacific oceans have shown to play a key role in modulating rainfall variability over northern Mexico. Nevertheless, only a few studies have explored these teleconnections under a climate classification approach. In this study, the effects of the Pacific Decadal Oscillation (PDO), the Oceanic El Niño Index (ONI) and the Atlantic Multidecadal Oscillation (AMO), over precipitation in dry and semi-dry areas of the Baja California peninsula and the state of Tamaulipas are analyzed for the period 1951-2021. Pearson and Spearman correlations are compared and proven to have equivalent results despite the different physical conditions of the two territories. The results show several statistically significant correlations indicating that for the study regions, the correlation is negative throughout the year between the Standardized Precipitation Index (SPI) and AMO in latitudes above 28º N, while it is negative (positive) during the months of January-April (October-November) in lower latitudes. Simultaneously, the correlation is positive between SPI and ONI/PDO in eastern and western regions of northern Mexico, and it is negative between SPI-ONI and SPI-PDO in the months of August-September over the eastern side. The information generated throughout this study, in conjunction with the understanding of regional climate dynamics, can help to comprehend with greater certainty the effects of these teleconnections.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53252 Urban atmospheric humidity excesses and deficits in two Mexican metropolises: Guadalajara and Puebla 2023-05-19T20:15:25+00:00 Adalberto Tejeda-Martínez atejeda@uv.mx Gabriel Balderas-Romero gbr_48@hotmail.com Luz Elena Moreyra-González luzemoreyra@gmail.com J. Omar Castro-Díaz omcastro293@gmail.com <p class="p1">Comparative studies of atmospheric humidity between urban and suburban and urban-rural environments are scarce, and their results are very scattered and inconclusive. In this paper, we compare differences in atmospheric temperature, relative humidity and absolute humidity measured at the limits between the urban canopy and the boundary layer in two elevated metropolises in Mexico: Guadalajara and Puebla. Results show that variations in relative humidity contrasts between different environments have an inverse relationship with the temperature variations. In Guadalajara, the urban excesses of absolute humidity are predominant from May to September. In Puebla the urban-suburban contrasts are lower than in Guadalajara, following a daily cycle and being negative between noon and 18:00 LT. From March to September urban-rural differences in Puebla are positive between 10:00 and 18:00 LT, and weak during the nocturnal period.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53244 Distribution changes of the toxic mushroom Amanita phalloides under climate change scenarios and its potential risk over indigenous communities in Mexico 2023-02-20T21:05:33+00:00 Abril Villagrán-Vázquez abrilgomezb@gmail.com Roberto Garibay-Orijel rgaribay@ib.unam.mx Carolina Ureta carolinaus@atmosfera.unam.mx <p class="p1"><em>Amanita phalloides</em> is a native European deathly ectomycorrhizal mushroom that was introduced to North America and has been expanding its distribution during the last decades. This species is morphologically similar to wild edible mushrooms and if its distribution expands to Mexico, it could represent a risk in terms of food security for local communities. The aim of this study was to evaluate the potential climatic suitability that exists for <em>A. phalloides</em> in North America and overlay it with the distribution of mycophilic communities in Mexico under a baseline climatic scenario and climate change scenarios. To find climatic suitability we modeled its potential distribution with the algorithm that had the best predictive power after pilot test (MaxEnt) using species presences and eight climatic variables chosen with biological and statistical criteria. We worked with CanESM5 because it is one of the best models to simulate climate in North America and SSP5-8.5 scenario in order to be consistent with the precautionary principle. Our results suggest that even when the species has not yet been registered in Mexico, when using European records to model, this country presents 33.61% of climatic suitability for this species under the baseline scenario, potentially affecting about 70% of indigenous communities which are the main consumers of edible mushrooms. Under climate change scenarios, an increase in climatic suitability is expected in Mexico, while decreases are expected in United States and Canada. When using North American records to model, almost no climatic suitability is found in Mexico; however, the implementation of warning campaigns in Mexico is still needed.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53227 Satellite data geoprocessing to estimate PM2.5 over the Megalopolis of Central Mexico 2023-02-20T20:55:24+00:00 Marco Antonio Mora-Ramírez marco.x.mora@gmail.com Edgar Martínez-Luna edgar.martinez@gmail.com Xochitl Cruz-Núñez xochitl.cruz@atmosfera.unam.mx <p class="p1">The Megalopolis of Central Mexico experiences high levels above the Official Mexican Standard (NOM) of PM<sub>2.5</sub>, leading to various respiratory diseases ranging from acute symptoms to chronic illnesses such as asthma and lung cancer. It is crucial to measure PM<sub>2.5</sub> levels accurately to warn the public about the risks of exposure to particulate matter. Unfortunately, the Megalopolis of Central Mexico has a shortage of monitoring sites, limiting data availability. This study addresses this issue using satellite data to develop a multiple linear regression model. Our model uses aerosol optical depth (AOD), relative humidity (RH), temperature (T), the planetary boundary layer height (PBLH), and the normalized difference vegetation index (NDVI) as independent variables to estimate PM<sub>2.5</sub> concentrations in the region under study. The relationship between AOD and PM<sub>2.5</sub> concentrations was found to be strongly influenced by RH and T. However, this effect is compensated for by a low PBLH (&lt; 400 m), which enables AOD and PM<sub>2.5</sub> measurements to be similar in magnitude. Our findings have important implications for estimating PM<sub>2.5</sub> concentrations using satellite data. This study could help improve air quality monitoring in the Megalopolis of Central Mexico by providing more spatial and temporal data on particle concentrations in the atmosphere.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53226 El Niño-Southern Oscillation diversity and its relationship with the North Atlantic Oscillation – Atmospheric anomalies response over the North Atlantic and the Pacific 2022-11-16T16:00:34+00:00 Gabriel Santiago Gutiérrez-Cárdenas gabriels.gutierrezc@utadeo.edu.co Diana Cristina Díaz dianac.diaz@utadeo.edu.co <p class="p1">To explore the impacts of El Niño-Southern Oscillation (ENSO) on the North Atlantic Oscillation (NAO), the linear correlation among the indices of each oscillation was investigated. The indices Niño 1+2, Niño 3, Niño 3.4, Niño 4, ONI, SOI, BEST, TNI and MEI were used to represent the ENSO, besides the NAO index. The analysis considers the ENSO diversity in its spatial structure. The results show that when years with Eastern Pacific (EP) La Niña events were omitted, the linear correlation increased concerning other scenarios. This means that NAO responses for the Central Pacific (CP) ENSO tend to be linear, but seemingly they are not so for EP ENSO, which explains why the ENSO/NAO relationship has been difficult to identify and predict. The TNI-NAO relationship had the highest correlation values, followed by NAO-El Niño 4, whilst NAO/El Niño 1+2 and NAO/El Niño 3 showed the lowest coefficients. The results also confirmed that the atmospheric dynamics over the North Atlantic have a more linear teleconnection to the West and Central Pacific than to the Eastern Pacific. Changes in deep convection, atmospheric circulation, and vorticity are discussed like possible mechanisms that trigger the changes in impacts over the North Atlantic and other locations. The composite anomalies map also showed the contrast in the effects of both events and the importance of considering those differences when modeling ocean dynamics.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53201 Structural change points of NDVI in Mexico driven by climate oscillations 2023-03-23T21:01:25+00:00 Oscar O. Díaz oodr72@gmail.com Graciela B. Raga raga@unam.mx Arturo I. Quintanar arturo.quintanar@atmosfera.unam.mx John F. Mejía john.mejia@dri.edu <p class="p1">Based on the climatology of air temperature, precipitation, and the normalized vegetation index (NDVI), a regionalization of Mexico for the rainy season is presented through a non-parametric clustering algorithm known as DBSCAN. Thirty years of data, spanning from 1984 to 2013, are used to detect structural change points with the Mann-Kendall and Pettitt non-parametric tests applied on the NDVI, mean daily precipitation, 99th percentile precipitation, and mean daily air temperature. The relative predictive importance of the parameters examined was estimated using a Machine-Learning Random Forest algorithm that allows establishing a connection between changes in the NDVI and changes in air temperature, average precipitation, and extreme precipitation for some regions. Modulation by large-scale climate phenomena, such as the Atlantic Multidecadal Oscillation (AMO) and the Pacific Decadal Oscillation (PDO), as well as interannual modulation by El Niño/Southern Oscillation (ENSO) are explored. Structural change points in the series appear to be modulated mainly by the phase shift of the AMO and those of the ENSO and PDO in 1997.</p> 2023-09-25T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53248 Evaluation of the SACZ index as a prognostic tool based on GFS forecasts 2023-02-28T18:55:36+00:00 Louise da Fonseca Aguiar louisefonseca@id.uff.br Marcio Cataldi mcataldi@id.uff.br Edilson Marton edilson.marton@igeo.ufrj.br Eric Miguel Ribeiro eric.mrib@gmail.com Priscila da Cunha Luz luz.priscila@gmail.com <p class="p1">The South Atlantic Convergence Zone (SACZ) is an atmospheric phenomenon typical of summertime where a band of nebulosity causes intense or persistent rainfall in many regions of Brazil. SACZ episodes can be responsible for many natural disasters. Besides, the impacts of rainfall on water availability and consequently on the energy sector are extensive. The main objective of this study was to investigate the implementation of the SACZ index as an objective forecasting tool using input data from the Global Forecast System (GFS) model. Initially, we compared the index with the SACZ events identified by the Center for Weather Forecasting and Climate Studies (CPTEC ) from 2017 to 2021. Results showed that the index represented all events identified SACZs by CPTEC. Finally, we used data from the GFS 0.25 Degree from 2017 to 2021 to calculate Accuracy, Probability of detection, and False alarm ratio to evaluate the SACZ index as a prediction tool. Three thresholds are defined for the binary classification of a possible SACZ event. Results showed that above the most sensitive threshold (h1), within 10 days in advance, the sign of a possible SACZ can be detected. For the intermediate threshold (h2), a forecast of 96 h can detect a sign. For the most specific threshold (h3), the index can detect the event within 72 h in advance with a probability of detection of almost 90%. The SACZ index proved to be an efficient tool for detecting the dynamics of the phenomenon and can be used to assist operationally and in decision-making.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53234 Modeling tropical storm Elsa: Flood map simulation using multisensory precipitation in Connecticut 2023-01-27T19:40:19+00:00 Juan M. Stella juan.m.stella@gmail.com <p class="p1">A flood map simulation in the Fenton River watershed, Connecticut, was conducted for Tropical Storm Elsa occurred in early July 2021, using Multi Radar Multi Sensor-Quantitative Precipitation Estimation (MRMS-QPE) as input to force the Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) to simulate discharges in the mainstream of the watershed. The simulated discharges were calibrated using observed discharges at the Old Turnpike Bridge USGS station, and they were used to force a Hydrologic Engineering Center-River Analysis System (HEC-RAS) 2D model of the Fenton River watershed. The simulated stages were calibrated using observed stages at Old Turnpike Bridge USGS station to simulate flood maps in the mainstream of the watershed. The resulting use of HEC-HMS and HEC-RAS 2D models coupled with MRMS-QPE precipitation shows that these models set up is user-friendly. The model shows stability and the capacity to simulate flood maps along the whole mainstream of the Fenton River with good accuracy.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53232 Dense fog simulation in southern Brazil using the WRF model with high spatial resolution 2023-03-14T01:36:35+00:00 Judith Rodrigues Cardoso judithrodriguees@gmail.com Edilson Marton edilson.marton@igeo.ufrj.br Flávia Rodrigues Pinheiro flaviameteoro@gmail.com William Cossich wcossich@lamma.ufrj.br Nilton Oliveira Moraes moraes.nilton@gmail.com <p class="p1">Fog is an atmospheric phenomenon that reduces horizontal visibility to 1000 m or less. These phenomena affect different human activities, mainly those associated with air, maritime, and road transport. Rio Grande city, located in southern Brazil, has one of the main Brazilian ports, and fog occurrences at this location cause several inconveniences, such as the interruption of port activities and increases in operating costs. Thus, a better understanding of fog formation and dissipation, and the consequent improvement in its forecasts, can bring significant help to the port activities in that region. Therefore, this work seeks to evaluate the WRF model’s ability to simulate fog events in Rio Grande city. Four study cases of dense fogs were performed for this goal, as well as a sensitivity test to select the best vertical resolution configuration of the model. Meteorological data from the Rio Grande pilotage station and the Brazilian Coastal Monitoring System buoys were analyzed. Satellite images and synoptic charts were also analyzed for the study cases. The numerical simulations were performed using the WRF model with three nested domains, where 1 km was the highest horizontal resolution. The Fog Stability Index (FSI) and two estimates of horizontal visibility were evaluated. Simulations show promising results, highlighting the ability of the model to identify the fog occurrence in the area of interest and represent aspects of its dissipation process. Furthermore, it is noteworthy that the FSI and the evaluated visibility estimates were sensitive to the occurrence of the events.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53204 Occurrence and characteristics of snowfall on the highest mountain of Mexico (Citlaltépetl volcano) through the ground’s surface temperature 2022-11-04T18:29:09+00:00 Víctor Soto islaveracruz@gmail.com Hugo Delgado-Granados hdelgado@unam.mx <p class="p1">Snow has great environmental importance. Its physical properties influence the ground temperature; its long-term accumulation adds to the mass of glaciers and is also a clear indicator of climate variability. However, despite the frequency of snowfall in tropical high-mountain environments, its quantitative study is very scarce, and it is non-existent in the case of Mexico. Due to the altitude of a large part of the Mexican territory and the high ecosystem value of the snow, in this work we analyze the temporality, accumulation, and duration of the snow cover on the highest mountain in the country. The data obtained through continuous monitoring of the surface temperature of the ground allowed us to identify that snowfall occurs with greater frequency and volume during the summer and autumn months, while during the winter snowfall of less intensity occurs. The accumulation values are mostly less than 30 cm thick, and the duration of the snowpack is on average less than two weeks; however, there are episodes of greater depth and duration.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53185 Drought Potential in Borneo Based on the RCP 4.5 Scenario 2022-08-18T11:19:18+00:00 Amalia Nurlatifah amalianurlatifah92@gmail.com Fildzah Adany fildzah.adany@brin.go.id Aulia Darojatun aulia.darojatun@brin.go.id Bambang Siswanto bambang.siswanto@brin.go.id Sinta Berliana Sipayung s_berlianasipayung@yahoo.com <p class="p1">One of the impacts of climate change is an increase in the frequency and intensity of hydrometeorological disasters such as prolonged droughts. Borneo is one of the areas threatened by drought due to climate change. Therefore, it is important to identify and implement appropriate mitigation and adaptation measures. This study used the dynamical downscaling method by the Conformal Cubic Atmospheric Model (CCAM) to evaluate the potential for drought events in Borneo based on the RCP 4.5 scenario. The annual rainfall in Borneo for 2021-2050 is projected to increase compared to 1991-2020. However, the increase in annual rainfall does not free Borneo from the possibility of drought events in the future. This study’s results indicate that areas in southern Borneo, such as Banjarmasin, Pangkalan Bun, and Pontianak, will have a higher frequency of meteorological drought events and are also expected to experience longer periods of consecutive dry days between 2021-2050 compared to 1991-2020.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera https://www.revistascca.unam.mx/atm/index.php/atm/article/view/53181 Development and evaluation of a bulk three-moment parameterization scheme incorporating the processes of sedimentation and collision-coalescence 2022-06-16T10:43:36+00:00 Lainer Donet lainer.donet@atmosfera.unam.mx Lester Alfonso lesterson@yahoo.com <p class="p1">There are a few three-moment schemes that consider other processes besides sedimentation. Thus, a performance assessment of these types of schemes due to the combined effect of sedimentation and other microphysical processes is a matter of interest. In this study, a warm rain bulk three-moment parameterized scheme was developed and evaluated through a detailed comparison with a bin microphysical scheme. To evaluate the impact of sedimentation and the combined effect of sedimentation and collision-coalescence on the droplet size distribution (DSD), a rain shaft model was applied to the DSD with different initial values of the shape parameter. For pure sedimentation, a good correspondence was obtained between the three-moment scheme and the explicit model, with a practically perfect coincidence of bulk quantities for larger values of the gamma distribution’s initial shape parameter and, in general, the three-moment parameterization scheme performing much better than the two-moment scheme. The simulations performed for this case confirm (as reported in previous studies) that for pure sedimentation, the three-moment parameterization schemes deliver a physically more complete representation of the evolution of droplet size distribution. The impact of the combined effect of sedimentation and collision-coalescence processes on DSD was also assessed. We could observe that certain differences arise between the parameterized scheme and the spectral model when the collision-coalescence process is incorporated, as the onset of precipitation occurs earlier in the three-moment parameterized scheme. It can be concluded that, in general, the three-moment warm rain bulk microphysics scheme is able to reproduce the results of the reference bin microphysical model.</p> 2023-08-01T00:00:00+00:00 Copyright (c) 2023 Atmósfera