Publication

Thermal IR radiative properties of mixed mineral dust and biomass aerosol during SAMUM-2

Koehler, C. H., Trautmann, T., Lindermeir, E., Vreeling, W., Lieke, K., Kandler, K., Weinzierl, B., Gross, S., Tesche, M. & Wendisch, M., Sep-2011, In : Tellus. Series B: Chemical and Physical Meteorology. 63, 4, p. 751-769 19 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • Claas H. Koehler
  • Thomas Trautmann
  • Erwin Lindermeir
  • Willem Vreeling
  • Kirsten Lieke
  • Konrad Kandler
  • Bernadett Weinzierl
  • Silke Gross
  • Matthias Tesche
  • Manfred Wendisch

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.

Original languageEnglish
Pages (from-to)751-769
Number of pages19
JournalTellus. Series B: Chemical and Physical Meteorology
Volume63
Issue number4
Publication statusPublished - Sep-2011

    Keywords

  • EMITTED RADIANCE INTERFEROMETER, OPTICAL-CONSTANTS, INFRARED SPECTRORADIOMETER, SOFTWARE PACKAGE, AMMONIUM-SULFATE, SCATTERING, SPECTRA, CALIBRATION, ALGORITHMS, PARTICLES

View graph of relations

Download statistics

No data available

ID: 5391175