Annual cycle of ozone at and above the tropical tropopause: observations versus simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS)
Item
Title (Dublin Core)
Annual cycle of ozone at and above the tropical tropopause: observations versus simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS)
Description (Dublin Core)
Multi-annual simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS) were conducted to study the seasonality of O<sub>3</sub> within the stratospheric part of the tropical tropopause layer (TTL), i.e. above θ=360 K potential temperature level. In agreement with satellite (HALOE) and in-situ observations (SHADOZ), CLaMS simulations show a pronounced annual cycle in O<sub>3</sub>, at and above θ=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<sub>3</sub> to the lowest values in early spring. Both CLaMS simulations and Aura MLS O<sub>3</sub> observations consistently show that enhanced in-mixing in summer is mainly driven by the Asian monsoon anticyclone.
Creator (Dublin Core)
Konopka, P.
Grooß, J.-U.
Günther, G.
Ploeger, F.
Pommrich, R.
Müller, R.
Livesey, N.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-10-121-2010
https://acp.copernicus.org/articles/10/121/2010/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
