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The longwave emission signature of urban pollution: Radiometric FTIR measurement
Author(s) -
Lubin Dan,
Simpson A. Sabrina
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl03374
Subject(s) - radiance , environmental science , spectroradiometer , downwelling , longwave , troposphere , atmospheric sciences , moderate resolution imaging spectroradiometer , infrared , remote sensing , radiation , geology , physics , optics , satellite , oceanography , astronomy , upwelling , reflectivity
Air pollutants trapped beneath frequent temperature inversions in the Los Angeles basin bring about surface radiance enhancements of up to fifty percent in the middle‐infrared window (8–12 microns). This constitutes an anthropogenic modification to the downwelling longwave flux which can be as large as 9 W/m². A Fourier Transform Infrared (FTIR) spectroradiometer has been used to measure middle‐infrared atmospheric emission spectra under Los Angeles smog, and these 1 cm −1 resolution spectra demonstrate that both anthropogenic aerosols and increased tropospheric ozone abundance contribute to enhancements in surface longwave radiation.