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GEOPHYSICAL RESEARCH LETTERS,
VOL. 36,
L24805,
5 PP., 2009
doi:10.1029/2009GL041002
Relative humidity dependence of light absorption by mineral dust after long-range atmospheric transport from the Sahara
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Cooperative Institute for Research of the Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Pacific Marine Environment Laboratory, NOAA, Seattle, Washington, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Cooperative Institute for Research of the Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Pacific Marine Environment Laboratory, NOAA, Seattle, Washington, USA
Pacific Marine Environment Laboratory, NOAA, Seattle, Washington, USA
Atmospheric Sciences Department, University of Washington, Seattle, Washington, USA
Atmospheric Sciences Department, University of Washington, Seattle, Washington, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Cooperative Institute for Research of the Environmental Sciences, University of Colorado, Boulder, Colorado, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
Earth Systems Research Laboratory, NOAA, Boulder, Colorado, USA
The relative humidity (RH) dependence of light absorption for a Saharan dust-dominated air mass transported to the Gulf of Mexico was measured during the 2006 TexAQS/GoMACCS study using a photo-acoustic absorption spectrometer (PAS). Aerosol absorption was measured at low (25%) and high (73%) RH indicating a 1.5(±0.3) absorption enhancement [f(RHAbs)] under high RH conditions. f(RHAbs) estimates, based on air-mass physical and optical properties and Mie theory modeling, were between 1.2–1.4. Reasons for differences between the measured and modeled f(RHAbs) are discussed. The mass absorption coefficient of the long-range transported dust was calculated to be 0.04(±0.02) m2g−1.
Received 15 September 2009; accepted 17 November 2009; published 19 December 2009.
Citation: (2009), Relative humidity dependence of light absorption by mineral dust after long-range atmospheric transport from the Sahara, Geophys. Res. Lett., 36, L24805, doi:10.1029/2009GL041002.
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