Preprints
https://doi.org/10.5194/acp-2022-641
https://doi.org/10.5194/acp-2022-641
 
04 Oct 2022
04 Oct 2022
Status: this preprint is currently under review for the journal ACP.

Distribution of cross-tropopause convection within the Asian monsoon region from May through October 2017

Corey E. Clapp1, Jessica B. Smith1, Kristopher M. Bedka2, and James G. Anderson1,3,4 Corey E. Clapp et al.
  • 1Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, 02138, U.S.A.
  • 2NASA Langley Research Center, Hampton, 23681, U.S.A.
  • 3Department of Chemistry and Chemical Biology, Harvard University, Cambridge, 02138, U.S.A.
  • 4Department of Earth and Planetary Sciences, Harvard University, Cambridge, 02138, U.S.A.

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 geographic, 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.

Corey E. Clapp et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-641', Anonymous Referee #1, 27 Oct 2022
  • RC2: 'Comment on acp-2022-641', Anonymous Referee #2, 05 Nov 2022

Corey E. Clapp et al.

Corey E. Clapp et al.

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Short summary
Convection in the Asian monsoon provides an important pathway for the transport of boundary layer and tropospheric air, and potentially pollution and chemically active species, into the stratosphere. We analyzed the distribution of the fastest and deepest convection with geostationary satellite detections for the months of May through October of 2017. We find significant differences in the geographic and monthly distributions of cross-tropopause convection across the Asian monsoon region.
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