Implications of the In-Situ Measured Mass Absorption Cross Section of Organic Aerosols in Mexico City on the Atmospheric Energy Balance, Satellite Retrievals, and Photochemistry

Journal Article · Wed Mar 11 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3116938· OSTI ID:21293343

Dix, B; Volkamer, R ^[1]; Barnard, J C ^[2]

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1. University of Colorado, Boulder, Colorado (United States)
2. Pacific Northwest National Laboratory, Richland, Washington (United States)

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 m{sup 2}/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.

• OSTI ID: 21293343
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1100; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
ABSORPTION
AEROSOLS
ALBEDO
CROSS SECTIONS
EARTH ATMOSPHERE
FILTERS
MASS SPECTROSCOPY
MEXICO
ORGANIC COMPOUNDS
PHOTOCHEMISTRY
RADIANT HEAT TRANSFER
REMOTE SENSING
SCATTERING
SOLAR RADIATION
URBAN AREAS