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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2007
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| Online Access: | https://www.redalyc.org/articulo.oa?id=56520303 |
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Table of Contents:
- Study of diurnal and seasonal variation of atmospheric NO2, O3, H2O and O4 at Pune, India G. S. Meena D. B. Jadhav Biología Ozone nitrogen dioxide solar zenith angle vertical column density diurnal and seasonal variation Study of diurnal and seasonal variation of atmospheric trace gases is essential to understand our atmosphere.For this, daily zenith-sky scattered light observations have been made by UV-visible spectrometer during theperiod 2000-2003. Slant column densities (SCD) from morning (solar zenith angle SZA = 90°) to evening(SZA = 90°) were retrieved to see the diurnal variation of NO2, O3, H2O and O4. For the study of seasonalbehavior of NO2 and O3, vertical column densities (VCD) were retrieved during the above period. For thewhole period, NO2 and O3 VCD are found in a positive correlation of r = 0.72 for the morning data and r =0.79 for the evening data. Satellites borne observations are compared with the spectroscopic observations,which are found in good correlation. It is seen that highest NO2 and O3 VCD are found in summer months2 May and June) and lowest in winter months (December and January). Evening NO2 VCD are found highercompared to morning. There is found an interesting seasonal change that at Pune (18°32´ N, 73°51´ E), theevening-to-morning (PM/AM) ratios of NO2 as well as temperature maximum/minimum ratios are higherin winter months and lower in summer months during the above period. In winter months NO2 PM/AMratio goes up to 3.8 and in summer months lowest ratio is 1.25. During the day, N2O5 can be photolyzed toregenerate NO2, which reflects in the evening hours. In the winter, nights are longest; therefore, during nightNO2 to N2O5 conversion is more, hence in the morning NO2 value will be less that leads to high PM/AMratio. O3 PM/AM ratio is slightly higher in winter months compared to summer months. 2007 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56520303 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.3 Vol.20