The longwave emission signature of urban pollution: Radiometric FTIR measurement

Details The longwave emission signature of urban pollution: Radiometric FTIR measurement The longwave emission signature of urban pollution: Radiometric FTIR measurement

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21...37l&link_type=abstract

Geophysical Research Letters, Volume 21, Issue 1, p. 37-40

Physics

12

Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Atmospheric Composition And Structure: Pollution-Urban And Regional, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

Air pollutants trapped beneath frequent temperature inversions in the Los Angeles basin bring about surface radiance enhancements of up to fifty precent 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.

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