Distribution of cross-tropopause convection within the Asian monsoon region from May through October 2017
Abstract. We constructed a database of cross-tropopause convection in the Asian monsoon region for the months of May through October of 2017 using overshooting tops (OTs), deep convective features that penetrate the local cirrus anvil layer and the local tropopause, with Meteosat-8 geostationary satellite detections. The database of 40,918 OTs, represents a hemispheric record of convection covering the study domain from 10° S to 55° N and from 40 to 115° E. With this database, we analyzed the
... ographic, monthly, and altitude distribution of this convection and compared it to the convective distributions represented by satellite observations of outgoing longwave radiation (OLR) and precipitation. We find that cross-tropopause convection is most active during the months of May through August (with daily averages of these months above 300 OTs/day) and declines through September and October. Most of this convection occurs within North and South India, the Bay of Bengal, and the Indian Ocean regions, which together account for 75.1 % of all OTs. We further identify distinct, differing seasonal trends within the study subregions. For the North India, South India, and Bay of Bengal regions the distribution of OTs follows the development of the Asian Monsoon, with its north-south movement across the study period. This work demonstrates that when evaluating the effects of convection on lower stratospheric composition over the Asian monsoon region it is important to both consider cross-tropopause convection and the contributions across the entire region due to the significant geographic and monthly variation in convective activity.