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Change of Atmospheric Boundary Layer Thermal Regime Induced by Aerosol as Measured by MTP-5

Koldaev, A.V.(a), Kadygrov, E.N.(a), Khaikine, M.N.(a), Kuznetsova, I.N.(b), and Golitsyn, G.S.(c), Central Aerological Observatory (a), Hydrometeorological Center (b), A.M.Obukhov Institute of Atmospheric Physics Russian Academy of Science (c)
Fourteenth Atmospheric Radiation Measurement (ARM) Science Team Meeting

Change in atmospheric boundary layer (ABL) radiation balance as caused by natural and anthropogenic reasons is an important topic of ARM Project. The influence of aerosol while its concentration was extremely high within a long period of time was studied experimentally. The case was observed in Moscow region with the transport of combustion products from peat and forest fires in July- September, 2002. For the analysis the data were used of synchronous measurements by MTP-5(Microwave Temperature Profiler operating at wavelength 5mm) in two locations, namely: downtown Moscow and country-side which is 50 km apart to the West (Zvenigorod). Information about the pollution of ABL by aerosol was provided by the net of standard observations, and expeditionary (IFA RAN) also. The data obtained during analogous weather conditions in 2001 and 2003 years, when the concentration of aerosol was considerably lower, were used for comparisons. It was shown that the high concentration of aerosol leads to the dramatic deformation of radiation balance in ABL, namely: heating the contaminated layer; increasing of thermal stability, decreasing vertical gradients in day time almost twice in comparison with that observed in the reference years. Situations with local air pollution in the large city, when the trace of urban contamination does not influence the station in the rural locality were also analyzed. In such cases the greenhouse effect vividly appeared in the city. The strongest influence of aerosols on the radiation balance of urban ABL was observed at night and in the early morning hours.

Note: This is the poster abstract presented at the meeting; an extended version was not provided by the author(s).