%0 Journal Article
%A Konopka, P.
%A Grooß, J.-U.
%A Günther, G.
%A Plöger, F.
%A Pommrich, R.
%A Müller, R.
%A Livesey, N.
%T Annual cycle of ozone at and above the tropical tropopause: observations versus simulations with the Chemical Model of the Stratosphere (CLaMS)
%J Atmospheric chemistry and physics
%V 10
%@ 1680-7316
%C Katlenburg-Lindau
%I EGU
%M PreJuSER-7675
%P 121 - 132
%D 2010
%Z Record converted from VDB: 12.11.2012
%X Multi-annual simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) were conducted to study the seasonality of O-3 within the stratospheric part of the tropical tropopause layer (TTL), i.e. above theta = 360K potential temperature level. In agreement with satellite (HALOE) and in-situ observations (SHADOZ), CLaMS simulations show a pronounced annual cycle in O-3, at and above theta = 380 K, with the highest mixing ratios in the late boreal summer. Within the model, this cycle is driven by the seasonality of both upwelling and in-mixing. The latter process occurs through enhanced horizontal transport from the extratropics into the TTL that is mainly driven by the meridional, isentropic winds. The strongest in-mixing occurs during the late boreal summer from the Northern Hemisphere in the potential temperature range between 370 and 420 K. Complementary, the strongest upwelling occurs in winter reducing O-3 to the lowest values in early spring. Both CLaMS simulations and Aura MLS O-3 observations consistently show that enhanced in-mixing in summer is mainly driven by the Asian monsoon anticyclone.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000274224600011
%R 10.5194/acp-10-121-2010
%U https://juser.fz-juelich.de/record/7675