Ozone variation during a case of cyclogenesis
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Abstract
The relationship between total column ozone (TCO) and the development of a cyclonic system that occurred in the period from January 18 to January 25, 1981 has been studied using the ERA-Interim reanalysis database. It was found that TCO increases and decreases with the development and weakening of the cyclonic system. Also, a good correlation between TCO and the thickness of the layer was found between 1000-100 hPa and tropopause pressure. The study of daily variations in TCO based on the vertical distribution of the ozone mass mixing ratio (OMR) illustrate that with the beginning of the growth period there is a high decrease of the tropopause height, which was associated to high deepening of the cyclone and was accompanied by a significant vertical increase of OMR in the troposphere and stratosphere. The obvious significant increase of OMR starts at the stratospheric layer and is then transported to the tropospheric layer. The analysis of the time-height variation of the differences of OMR between the average of the domain containing the center of the cyclone at each level and the corresponding monthly average, illustrates that during the days of maximum deepening the positive values of OMR extend downwards to reach the 850 hPa level. The increase in positive values continues to be higher in the upper levels and reaches maximum values between 300-100 hPa and also between the 60-10 hPa layer. The characteristics of these changes of OMR concentrations from layer to layer are predominantly due to dynamical processes. Also, this was attributed to the effect of horizontal advection of ozone from a different neighboring region into the column, and by a vertical exchange of air between the high ozone at the stratosphere and low ozone at troposphere.
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H. Abdel Basset, Prof. Heshmat Abdel Basset Mohamed AL-Azhar University , Faculty of Science Department of Astronomy and Meteorology Nasr City, Cairo, Egypt P.o. Box 11884
Dr. Heshmat Abdel Basset earned a PhD from Cairo University in meteorology in 1997. He is a professor of dynamical meteorology in the Department of Meteorology and Astronomy, Faculty of science at Al-Azhar University. Prof. Abdel Basset supervised more than 20 MSc and PhD students. He was awarded the Young Scientist prize from the World Meteorological Organization in 2004. He published 50 papers in local and international scientific journals. He contributed in many projects in Egypt, United Arab Emirates, and Saudi Arabia, including cloud seeding and is a consultant to upgrade the Saudi Presidency of Meteorology and Environment (PME). His main interests include dynamical/physical meteorology, short term and seasonal forecasts and climate change and its impact on water resources and agriculture.
A. Badawi, Egyption Meteorological Authority, Cairo, Egypt.
Egyption Meteorological Authority, Cairo, Egypt.
M. Eid, AL-Azhar University , Faculty of Science Department of Astronomy and Meteorology Nasr City, Cairo, Egypt P.o. Box 11884
AL-Azhar University , Faculty of Science
Department of Astronomy and Meteorology
Nasr City, Cairo, Egypt
P.o. Box 11884
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