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Trends in peroxyacetyl nitrate (PAN) in the upper troposphere and lower stratosphere over southern Asia during the summer monsoon season: Regional impacts

Fadnavis, S.; Schultz, M.G.; Semeniuk, K.; Mahajan, A.S.; Pozzoli, L.; Sonbawne, S.; Ghude, S.D.; Kiefer, M.; Eckert, E.

We analyze temporal trends of peroxyacetyl nitrate (PAN) retrievals from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) during 2002– 2011 in the altitude range 8–23 km over the Asian summer monsoon (ASM) region. The greatest enhancements of PAN mixing ratios in the upper troposphere and lower stratosphere (UTLS) are seen during the summer monsoon season from June to September. During the monsoon season, the mole fractions of PAN show statistically significant (at 2σ) positive trends from 0.2 ±0.05 to 4.6 ±3.1 ppt yr$^{-1}$ (except between 12 and 14 km) which is higher than the annual mean trends of 0.1±0.05 to 2.7±0.8 ppt yr$^{-1}$. These rising concentrations point to increasing NOx (=NO+NO2) and volatile organic compound (VOC) emissions from developing nations in Asia, notably India and China. We analyze the influence of monsoon convection on the distribution of PAN in UTLS with simulations using the global chemistry–climate model ECHAM5-HAMMOZ. During the monsoon, transport into the UTLS over the Asian region primarily occurs from two convective zones, one the South China Sea and the other over the southern flank of the Himalayas. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000049255
Veröffentlicht am 09.05.2018
DOI: 10.5194/acp-14-12725-2014
Zitationen: 31
Web of Science
Zitationen: 27
Zitationen: 28
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2014
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000049255
HGF-Programm 12.04.05 (POF II, LK 01)
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 14
Heft 23
Seiten 12725-12743
Nachgewiesen in Web of Science
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