Unexpectedly high aerosol load in the free troposphere over central Europe in spring/summer 2003

Details Unexpectedly high aerosol load in the free troposphere over central Europe in spring/summer 2003 Unexpectedly high aerosol load in the free troposphere over central Europe in spring/summer 2003

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30vasc9m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 22, pp. ASC 9-1, CiteID 2178, DOI 10.1029/2003GL018442

Physics

Geophysics

18

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Atmospheric Composition And Structure: Troposphere-Constituent Transport And Chemistry, Exploration Geophysics: Remote Sensing, Global Change: Impact Phenomena, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions

Scientific paper

We observed particle extinction coefficients of 5-30 Mm-1 and particle optical depths of 0.03-0.11 at UV and visible wavelengths in the free troposphere from May to July, 2003. In May and early June distinct aerosol layers could be observed above the boundary layer (typically between 3-7-km height). In contrast, the aerosol distribution became vertically more homogeneous and stretched to the tropopause by the end of June and in July. Most probably, severe forest fires in Siberia in the spring of 2003 caused this enhanced free tropospheric background. The observations were made with a Raman lidar operating at 355 and 532-nm wavelength at Leipzig, Germany. This lidar allows a clear identification of aged smoke in terms of spectrally resolved backscatter and extinction coefficients, particle optical depths, Ångström exponents, extinction-to-backscatter ratios, and depolarization ratio.

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