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Proceedings Paper

Systematic seasonal pattern of tropospheric trace gases over Indian region
Author(s): Prabha R. Nair; Girach I. A.; Kavitha M.; Revathy S. Ajayakumar
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Paper Abstract

The trace gases in the atmosphere constituting <1% of atmospheric mass form a crucial components with profound influence on the living environment and crucial climatic impacts. The large spatial and temporal heterogeneities in the distribution of these species demand measurements at regional scales with global coverage. This paper presents the spatio-temporal variation of atmospheric trace gases O3, NO2, CO and CH4 over Indian region and surrounding oceanic environment making use of data from Ozone Monitoring Instrument (OMI), Microwave Limb Sounder (MLS), Measurements of Pollution in the Troposphere (MOPITT) and Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY). The systematic seasonal pattern of these gases is presented along with their sources, sinks, active transport mechanisms and observed that the seasonal patterns are region dependent. Tropospheric ozone maximises during pre-monsoon season (March-April-May) with minimum during monsoon (July-August). There are significant differences in the seasonal patterns between northern and southern India and also over the oceanic regions. The spatio-temporal changes in O3 are closely linked with monsoon dynamics and atmospheric water vapor content. Tropospheric NO2, the major precursor of O3 is also lower during monsoon (June-July-August), remaining high during other months with maximum in winter. The lower-tropospheric CO maximises during winter and shows a broad minimum during summer-monsoon, but with regionally varying seasonal amplitudes CH4 depicts a different pattern maximising in monsoon/post-monsoon with peaks occurring late over southern India. The monsoonal low in the trace gases (except CH4) is primarily due to synoptic scale meteorology as cleaner airmass from Indian-ocean/Arabian Sea flow over Indian subcontinent during Asian monsoon.

Paper Details

Date Published:
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Proc. SPIE 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI, 98763C; doi: 10.1117/12.2225430
Show Author Affiliations
Prabha R. Nair, Vikram Sarabhai Space Ctr. (India)
Girach I. A., Vikram Sarabhai Space Ctr. (India)
Kavitha M., Vikram Sarabhai Space Ctr. (India)
Revathy S. Ajayakumar, Vikram Sarabhai Space Ctr. (India)


Published in SPIE Proceedings Vol. 9876:
Remote Sensing of the Atmosphere, Clouds, and Precipitation VI
Eastwood Im; Raj Kumar; Song Yang, Editor(s)

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