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Region-dependent seasonal pattern of methane over Indian region as observed by SCIAMACHY
Abstract The column averaged mixing ratio of methane (XCH4) from SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on-board satellite ENVISAT has been used to study its regional pattern and seasonal cycle over Indian region for the period 2003–2009. XCH4 varies from 1740 to 1890 ppbv over Indian region with distinct spatial and temporal features. The peak values are observed in monsoon and post monsoon and minimum in winter months, except over southern Peninsular India which shows the distinctly different seasonal behavior with peak in October/November. The mean background level of XCH4 over Indian region is estimated as ∼1795 ppbv. While regional patterns are strongly associated with livestock distribution, wetland emissions, including rice fields, the seasonal variations in XCH4 are predominantly associated with the rice cultivation as revealed by analysis of NDVI.
Highlights Column average CH4 mixing ratio (XCH4) from SCIAMACHY shows monsoonal peak and winter low. Monsoon-linked rice cultivation induces seasonality in XCH4 emission over India. XCH4 over southern India shows low in monsoon due to strong sink activities. Regionally XCH4 is positively correlated with livestock. The mean back ground value of XCH4 is estimated as ∼1795 ppbv over Indian region.
Region-dependent seasonal pattern of methane over Indian region as observed by SCIAMACHY
Abstract The column averaged mixing ratio of methane (XCH4) from SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) on-board satellite ENVISAT has been used to study its regional pattern and seasonal cycle over Indian region for the period 2003–2009. XCH4 varies from 1740 to 1890 ppbv over Indian region with distinct spatial and temporal features. The peak values are observed in monsoon and post monsoon and minimum in winter months, except over southern Peninsular India which shows the distinctly different seasonal behavior with peak in October/November. The mean background level of XCH4 over Indian region is estimated as ∼1795 ppbv. While regional patterns are strongly associated with livestock distribution, wetland emissions, including rice fields, the seasonal variations in XCH4 are predominantly associated with the rice cultivation as revealed by analysis of NDVI.
Highlights Column average CH4 mixing ratio (XCH4) from SCIAMACHY shows monsoonal peak and winter low. Monsoon-linked rice cultivation induces seasonality in XCH4 emission over India. XCH4 over southern India shows low in monsoon due to strong sink activities. Regionally XCH4 is positively correlated with livestock. The mean back ground value of XCH4 is estimated as ∼1795 ppbv over Indian region.
Region-dependent seasonal pattern of methane over Indian region as observed by SCIAMACHY
Kavitha, M. (author) / Nair, Prabha R. (author)
Atmospheric Environment ; 131 ; 316-325
2016-02-05
10 pages
Article (Journal)
Electronic Resource
English
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