Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 16, Issue 16, Pages 10489-10500Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-16-10489-2016
Keywords
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Funding
- INSU-CNRS (France)
- Meteo-France
- Universite Paul Sabatier (Toulouse, France)
- Research Center Julich (FZJ, Julich, Germany)
- EU project IAGOS-DS
- EU project IAGOS-ERI
- European Commission
- Airbus
- Lufthansa
- Air-France
- Austrian
- Air Namibia
- Cathay Pacific
- Iberia
- China Airlines
- East Asian Monsoon and air quality project
- DRAGON program
- EU-FP7 PANDA project
- EUMETSAT O3M-SAF project
- ESA O3 Climate Change Initiative (O3-CCI)
- CNES
- Centre National de la Recherche Scientifique (CNRS)
- Belgian State Federal Office for Scientific, Technical and Cultural Affairs
- European Space Agency (ESA Prodex arrangement)
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Satellite measurements from the thermal Infrared Atmospheric Sounding Interferometer (IASI), aircraft data from the MOZAIC/IAGOS project, as well as observations from ground-based stations, are used to assess the tropospheric ozone (O-3) variability during the East Asian Summer Monsoon (EASM). Six years 2008-2013 of IASI data analysis reveals the ability of the instrument to detect the onset and the progression of the monsoon seen by a decrease in the tropospheric 0-6 km O-3 column due to the EASM, and to reproduce this decrease from one year to the other. The year-to-year variability is found to be mainly dependent on meteorology. Focusing on the period of May-August 2011, taken as an example year, IASI data show clear inverse relationship between tropospheric 0-6 km O-3 on one hand and meteorological parameters such as cloud cover, relative humidity and wind speed, on the other hand. Aircraft data from the MOZAIC/IAGOS project for the EASM of 2008-2013 are used to validate the IASI data and to assess the effect of the monsoon on the vertical distribution of the tropospheric O-3 at different locations. Results show good agreement with a correlation coefficient of 0.73 (12 %) between the 0-6 km O-3 column derived from IASI and aircraft data. IASI captures very well the inter-annual variation of tropospheric O3 observed by the aircraft data over the studied domain. Analysis of vertical profiles of the aircraft data shows a decrease in the tropospheric O-3 that is more important in the free troposphere than in the boundary layer and at 10-20 degrees N than elsewhere. Ground station data at different locations in India and China show a spatiotemporal dependence on meteorology during the monsoon, with a decrease up to 22 ppbv in Hyderabad, and up to 5 ppbv in the North China Plain.
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