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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Response of ozone photochemical pathways to a doubling in CO2 Grenfell J.L. 1 , Lehmann R., Stock J., Patzer A.B.C. 1 Technische Universität Berlin, 2 We present results from a new diagnostic tool which sheds light on ozone photochemistry in the atmosphere. The tool - the Pathway Analysis Program (PAP) - automatically identifies and quantifies chemical pathways for ozone production and loss based on output from a coupled climatephotochemical model. We have analysed modern-day and doubled carbon dioxide conditions. Results are a valuable aid to understanding the potentially complex catalytic processes which affect atmospheric ozone and their response to carbon dioxide increases. The PAP tool (Lehmann, 2004) has already been applied with success to modern Earth conditions in the stratosphere (Grenfell et al. 2006).
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Trends and stability in the MLT-region - a model study Grygalashvyly Mykhaylo , Sonnemann Gerd , Berger Uwe , Lübken Franz-Josef Leibniz-Institute of Atmospheric Physics at the University Rostock in Kühlungsborn, Schloss-Str.6, D- 18225 Ostseebad Kühlungsborn, Germany The height of the NLC has not noticeably declined since the time of first observation. The term “equithermal submesopause” was introduced in 1996 and reflects the significant repeatability of the mean mesopause temperature during the last 40 years. The microwave measurements of water vapor at high latitudes (ALOMAR, 69°N) during last 14 years do not show significant positive trends in MLT-region. These facts motivate us to study the mechanisms of stabilization in the atmosphere and precisely in the summer mesopaus region which is astonishingly stable in spite of the anthropogenic changes. We investigate the influence of the rising concentrations of methane, nitrous oxide and carbon dioxide since 1961 on the chemistry of the mesosphere. We use our global 3D-model LIMA (Leibniz-Institute Middle Atmosphere) designed for the investigation of the MLT-region and particularly the extended mesopause region. LIMA uses real tropospheric and lower stratospheric temperature and horizontal wind up to 35 km altitude from assimilation of ECMWF/ERA-40. Realtime Lyman-α flux values are employed to determine the water vapor dissociation rate. The analysis of the long-term behavior of water vapor also utilizes real methane measurements. The solar influence on the water vapor mixing ratio is insignificant below about 75-80 km within high latitudes in summer, but becomes increasingly important above this domain. Three calculations were carried out and analyzed. 1. We use a constant annual variation of the model dynamics for all years according to the dynamics of the solar minimum in 1964 and employ a realistic growth of the anthropogenic gases. 2. We use constant concentrations of the anthropogenic constituents at the lower border but employ the varying dynamics. 3. The realistic case considers both, the increase of the anthropogenic minor constituents and yearly varying dynamics. The analyses of these 3 cases show, that the effect of dynamics reduces the influence of anthropogenic changes in the upper mesosphere-mesopause-lower thermosphere region. This probably occurs due to non-linear feed backs effect between dynamics and chemistry. Therefore, models with climatologically mean dynamics, apparently, overestimate anthropogenic impact. We also discuss the long-term behavior of water vapor with regard to the potential impact on NLC. Additionally, we estimate influences on the thermal regime of MLT-region.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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