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Spectral surface albedo over Morocco and its impact on radiative forcing of Saharan dust

Bierwirth, Eike and Wendisch, Manfred and Ehrlich, André and Heese, Birgit and Tesche, Matthias and Althausen, Dietrich and Schladitz, Alexander and Müller, Detlef and Otto, Sebastian and Trautmann, Thomas and Dinter, Tilman and von Hoyningen-Huene, Wolfgang and Kahn, Ralph (2007) Spectral surface albedo over Morocco and its impact on radiative forcing of Saharan dust. Tellus B - Chemical and Physical Meteorology, 61B (1), pp. 252-269. DOI: 10.1111/j.1600-0889.2008.00395.x.

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Official URL: http://www3.interscience.wiley.com/journal/118533053/home

Abstract

In May–June 2006, airborne and ground-based solar (0.3–2.2 μm) and thermal infrared (4–42 μm) radiation measurements have been performed in Morocco within the Saharan Mineral Dust Experiment (SAMUM). Upwelling and downwelling solar irradiances have been measured using the Spectral Modular Airborne Radiation Measurement System (SMART)-Albedometer. With these data, the areal spectral surface albedo for typical surface types in southeastern Morocco was derived from airborne measurements for the first time. The results are compared to the surface albedo retrieved from collocated satellite measurements, and partly considerable deviations are observed. Using measured surface and atmospheric properties, the spectral and broad-band dust radiative forcing at top-of-atmosphere (TOA) and at the surface has been estimated. The impact of the surface albedo on the solar radiative forcing of Saharan dust is quantified. In the SAMUM case of 19 May 2006, TOA solar radiative forcing varies by 12 W m<sup>-2</sup> per 0.1 surface-albedo change. For the thermal infrared component, values of up to +22 W m<sup>-2</sup> were derived. The net (solar plus thermal infrared) TOA radiative forcing varies between −19 and +24 W m<sup>-2</sup> for a broad-band solar surface albedo of 0.0 and 0.32, respectively. Over the bright surface of southeastern Morocco, the Saharan dust always has a net warming effect.

Document Type:Article
Title:Spectral surface albedo over Morocco and its impact on radiative forcing of Saharan dust
Authors:
AuthorsInstitution or Email of Authors
Bierwirth, EikeInstitute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
Wendisch, ManfredInstitute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
Ehrlich, AndréInstitute for Atmospheric Physics, Johannes Gutenberg University, Mainz, Germany
Heese, BirgitLeibniz Institute for Tropospheric Research, Leipzig, Germany
Tesche, MatthiasLeibniz Institute for Tropospheric Research, Leipzig, Germany
Althausen, DietrichLeibniz Institute for Tropospheric Research, Leipzig, Germany
Schladitz, AlexanderLeibniz Institute for Tropospheric Research, Leipzig, Germany
Müller, DetlefLeibniz Institute for Tropospheric Research, Leipzig, Germany
Otto, SebastianUNSPECIFIED
Trautmann, ThomasUNSPECIFIED
Dinter, TilmanInstitute of Environmental Physics, University of Bremen, Bremen, Germany
von Hoyningen-Huene, WolfgangInstitute of Environmental Physics, University of Bremen, Bremen, Germany
Kahn, RalphLaboratory for Atmospheric and Space Physics, University of Colorado, Boulder, USA
Date:21 December 2007
Journal or Publication Title:Tellus B - Chemical and Physical Meteorology
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:61B
DOI:10.1111/j.1600-0889.2008.00395.x
Page Range:pp. 252-269
Status:Published
Keywords:Saharan mineral dust, spectral measurements, spectral radiative forcing, spectral surface albedo, spectral irradiance, radiative transfer simulations
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Entwicklung von Atmosphärenprozessoren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Prof.Dr. Thomas Trautmann
Deposited On:21 Jan 2009
Last Modified:15 Jan 2010 00:05

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