Upper tropospheric ozone transport from the sub-tropics to tropics over the Indian region during Asian Summer monsoon using space borne and in situ observations
Abstract
In this study, we investigate the role of Asian summer monsoon (ASM) anticyclone in the ozone distribution over the tropical Indian region using Microwave Limb Sounder (MLS) onboard the Aura satellite and in situ ozonesonde observations. We present the horizontal and vertical structure of ozone in the upper troposphere and lower stratosphere (UTLS) region. In addition, the role of tropical tropopause derived from the vertical profiles of temperature obtained from the "Constellation Observing System for Meteorology Ionosphere and Climate" (COSMIC) satellite in the distribution of ozone in the UTLS region is also investigated. Results show that the ASM anticyclone region has low ozone, more water vapour, high cold-point tropopause (CPT) altitude, and low CPT pressure, compared to the other ASM regions during boreal summer. Southern side of ASM anticyclone, i.e. the tropical Indian region shows a remarkable high ozone concentration in the UTLS region during summer. Ozone concentration in the upper troposphere increases with strength of the tropical easterly jet, which is an outcome of the ASM phenomena. The mechanism responsible for the enhancement of ozone concentration in the UTLS region over the tropical Indian region has been discussed in this paper. The in situ ozonesonde observations from six Indian stations also support the space-based Aura-MLS observations, concluding that ASM anticyclone effectively transport ozone from the mid-latitude stratosphere to the tropical upper troposphere over the tropical Indian region. The detailed results will be presented in the upcoming symposium.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E.762D