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URN: urn:nbn:de:swb:90-599115

Interannual variability of the boreal summer tropical UTLS in observations and CCMVal-2 simulations

Kunze, Markus; Braesicke, Peter; Langematz, Ulrike; Stiller, Gabriele

Abstract:
During boreal summer the upper troposphere/ lower stratosphere (UTLS) in the Northern Hemisphere shows a distinct maximum in water vapour (H$_{2}$O) mixing ratios and a coincident minimum in ozone (O$_{3}$) mixing ratios, both confined within the Asian monsoon anticyclone (AMA). This well-known feature has been related to transport processes emerging above the convective systems during the Asian summer monsoon (ASM), further modified by the dynamics of the AMA. We compare the ability of chemistry–climate models (CCMs) to reproduce the climatological characteristics and variability of H$_{2}$O, O$_{3}$, and temperature in the UTLS during the boreal summer with MIPAS satellite observations and ERA-Interim reanalyses. By using a multiple linear regression model the main driving factors, the strength of the ASM, the quasi-biennial oscillation (QBO), and the El Niño–Southern Oscillation (ENSO), are separated. The regression patterns related to ENSO show a coherent, zonally asymmetric signal for temperatures and H$_{2}$O mixing ratios for ERA-Interim and the CCMs and suggest a weakening of the ASM during ENSO warm events. The QBO modulati ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen ID: 1000059911
HGF-Programm 12.04.03; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 13
Seiten 8695-8714
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