Thermal IR radiative properties of mixed mineral dust and biomass burning aerosol during SAMUM-2
Köhler, Claas and Trautmann, Thomas and Lindermeir, Erwin and Vreeling, Willem and Lieke, Kirsten and Kandler, Konrad and Weinzierl, Bernadett and Gross, Silke and Tesche, Matthias and Wendisch, Manfred (2011) Thermal IR radiative properties of mixed mineral dust and biomass burning aerosol during SAMUM-2. Tellus B - Chemical and Physical Meteorology, 63 (4), pp. 751-769. Blackwell Publishing Ltd. DOI: 10.1111/j.1600-0889.2011.00563.x.
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Ground-based high spectral resolution measurements of downwelling radiances from 800 to 1200 cm−1 were conducted between 20 January and 6 February 2008 within the scope of the SAMUM-2 field experiment. We infer the spectral signature of mixed biomass burning/mineral dust aerosols at the surface from these measurements and at top of the atmosphere from IASI observations. In a case study for a day characterized by the presence of high loads of both dust and biomass we attempt a closure with radiative transfer simulations assuming spherical particles. A detailed sensitivity analysis is performed to investigate the effect of uncertainties in the measurements ingested into the simulation on the simulated radiances. Distinct deviations between modelled and observed radiances are limited to a spectral region characterized by resonance bands in the refractive index. A comparison with results obtained during recent laboratory studies and field experiments reveals, that the deviations could be caused by the aerosol particles' non-sphericity, although an unequivocal discrimination from measurement uncertainties is not possible. Based on radiative transfer simulations we estimate the aerosol's direct radiative effect in the atmospheric window region to be 8 W m−2 at the surface and 1 W m−2 at top of the atmosphere.
|Title:||Thermal IR radiative properties of mixed mineral dust and biomass burning aerosol during SAMUM-2|
|Journal or Publication Title:||Tellus B - Chemical and Physical Meteorology|
|In Open Access:||Yes|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 751-769|
|Publisher:||Blackwell Publishing Ltd|
|Keywords:||Mineral Dust, Biomass Burning, Aerosol, TIR, FTIR, SAMUM-2, measurements, radiative forcing, radiative transfer|
|HGF - Research field:||Energy|
|HGF - Program:||no assignment|
|HGF - Program Themes:||E - no assignement|
|DLR - Research area:||Energy|
|DLR - Program:||E - no assignement|
|DLR - Research theme (Project):||E -- no assignement|
|Institutes and Institutions:||Remote Sensing Technology Institute > Atmospheric Processors|
Remote Sensing Technology Institute > Experimental Methods
|Deposited By:||Claas Henning Köhler|
|Deposited On:||24 Jan 2012 11:51|
|Last Modified:||26 Mar 2013 13:37|
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