An investigation of the Equivalent Effective Stratospheric Chlorine (EESC) budget over East Asia with Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) field measurements
Abstract
Manmade long-lived ozone-depleting substances (ODS), e.g., chlorofluorocarbons, and very-short-lived substances (VSLS) contain reactive chlorine that destroy stratospheric ozone via catalytic cycles. In addition to the contribution from continued emissions of Montreal Protocol regulated long-lived ODSs from existing banks, production, consumption, and feedstock, recent research has highlighted concern over rapidly growing emissions of a chlorinated VSLS, dichloromethane (CH2Cl2), in Asia as a result of fast economic growth. The ongoing NASA/NSF Asian Summer Monsoon Chemical and Climate Impact Project (ACCLIP) provides a great opportunity to sample key atmospheric measurements of long-lived and short-lived chlorinated source gases in Asian outflow in the Upper Troposphere and Lower Stratosphere (UT/LS) over the Western Pacific. In this study, we will combine model results from the NASA GEOS Chemistry Climate Model (GEOSCCM) and ACCLIP measurements to estimate (1) the abundance of MP-regulated long-lived ODSs and the not-controlled chlorinated-VSLSs in the Asian outflow, (2) the contribution of Asian emissions to the EESC w.r.t. global estimate.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2022
- Bibcode:
- 2022AGUFM.A56I..06L