Abstract
The absorption of short wave incoming solar radiation by the organic component of aerosols has been examined by using data from the MCMA‐2003 and the 2006 MILAGRO field campaigns. Both field efforts took place in and around Mexico City. Single Scattering Albedo (SSA) was derived as a function of wavelength (300–870 nm) by combining irradiance measurements from a Multi‐Filter Rotating Shadowband Radiometer (MFRSR) and spectrally resolved actinic flux measurements by spectroradiometry with a radiative transfer model (TUV). In addition, organic aerosol mass measured by a surface deployed aerodyne aerosol mass spectrometer was used to estimate the Mass Absorption Cross‐section (MAC) of Organic Carbon (OC). It was found that the MAC for OC is about 10.5 m2/g at 300 nm and falls close to zero at about 500 nm; these values are roughly consistent with previous MAC estimates of OC, and present first in‐situ observations of this quantity.
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