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GEOPHYSICAL RESEARCH LETTERS,
VOL. 31,
L08110,
5 PP., 2004
doi:10.1029/2003GL019269
Semiannual NO2 plumes during the monsoon transition periods over the central Indian Ocean
Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
Department of Atmospheric Chemistry, Max Planck Institute for Chemistry, Mainz, Germany
Institute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, Germany
Institute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, Germany
Institute of Environmental Physics and Remote Sensing, University of Bremen, Bremen, Germany
In this study we identify recurring plumes of tropospheric NO2 originating from Africa and Indonesia during the monsoon transition periods over the central Indian Ocean (CIO, 5°N–30°S, 55°E–95°E), based on GOME satellite observations and global model (MATCH-MPIC) simulations. Despite the relatively short lifetime of NOx, these strong plumes can develop due to the pronounced anti-cyclonic circulation over the CIO, and the weak maritime convection, which limits vertical mixing. Model results indicate that the plumes are mainly transported in the middle troposphere (MT). Thus, the CIO in the Southern Hemisphere (SH) is not always as pristine as found in INDOEX during the winter monsoon.
Received 12 December 2003; accepted 23 March 2004; published 30 April 2004.
Citation: (2004), Semiannual NO2 plumes during the monsoon transition periods over the central Indian Ocean, Geophys. Res. Lett., 31, L08110, doi:10.1029/2003GL019269.
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