HR: 0800h
AN: A11C-0607    [Abstracts]
TI: Comparative Analysis of the Long-term Trends of the Surface Ozone Concentration at Elevated Sites in the Alps and in Caucasus Region
AU: * Tarasova, O A
EM: tarasova@mpch-mainz.mpg.de
AF: Max-Planck Institute for Chemistry, Joh.-Joachim-Becher-Weg 27, Mainz, 55128, Germany
AU: Staehelin, J
AF: Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology Zürich, ETH-Hoenggerberg, Zurich, 8093, Switzerland
AU: Prevot, A S
AF: Paul Scherrer Institute, Villigen PSI, Villigen, 5232, Switzerland
AU: Senik, I A
AF: Obukhov Institute of Atmosphere Physics RAS, Pyzhevsky per. 3, Moscow, 109017, Russian Federation
AU: Sosonkin, M G
AF: International Center for Astronomical, Medical and Ecological Research NAS, Akademika Zabolotniho St. 27, Kiev, 03680, Ukraine
AU: Cui, J
AF: Institute for Atmospheric and Climate Science, Swiss Federal Institute of Technology Zürich, ETH-Hoenggerberg, Zurich, 8093, Switzerland
AB: Analysis of the long-term surface ozone records of two mountain sites, namely Kislovodsk High Mountain Station (KHMS) in Caucasus, Russia (43.7°N, 42.7°E, 2070 asl.) and Jungfraujoch (JFJ) in Switzerland (46.5°N, 7.9°E, 3580m asl) will be presented. A strong increase in ozone concentration (up +0.46±0.11ppb/year) was found at JFJ while ozone significantly deceased at KHMS (-0.65 ±0.09 ppb/year) during 1990-2005. We will compare trends values for earlier years (1990-2001) and for the latter ones (1993-2005). Among the possible reasons of the trends difference the impact of atmospheric transport is studied. Both vertical and horizontal components are considered in connection with ozone concentration trends. Transport analysis is based on 3D trajectories using LAGRANTO. There was no substantial difference in trends detected for different PV-levels or PBL filtered cases, while the main difference has been found in the source areas of the air masses at the two locations and inside different advection sectors at the each particular site. Trends will be compared (for the two receptor sites and two periods) for filtered subsets of upper tropospheric/stratospheric cases (based on PV and trajectory altitude), cases impacted by Planetary Boundary Layer (based on PBL height) and in different horizontal advection clusters. The work is financially supported by the Swiss National Science Foundation (JRP IB7320-110831), European Commission (Marie-Curie IIF project N 039905 - FP6-2005-Mobility-7) and Russian Foundation for Basic Research (projects 06-05-64427 and 06-05-65308) and contributes to ACCENT T&TP project.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting