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Measurements of continuous spectra of atmospheric absorption coefficients from UV to NIR via optical method
Author(s) -
Mogo S.,
Cachorro V. E.,
Sorribas M.,
de Frutos A.,
Fernández R.
Publication year - 2005
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 - 10.1029/2005gl022938
Subject(s) - extinction (optical mineralogy) , radiative transfer , absorption (acoustics) , ultraviolet , spectral line , molar absorptivity , integrating sphere , environmental science , angstrom exponent , absorption spectroscopy , exponent , remote sensing , atmospheric optics , atmospheric sciences , computational physics , materials science , physics , optics , geology , wavelength , linguistics , philosophy , astronomy
In this study we extend from the visible to the UV a traditional method for studying the radiative properties of black carbon. We apply this measuring possibility to a practical study carried out in the Southern Iberian Peninsula during summer 2004. Using an optical technique based on the integrating sphere method, absorption coefficients, σ a , were determined in the visible and in the ultraviolet regions of spectrum. The obtained values are representative of remote areas including during desert episodes that reach this area. To analyse the spectral shape of σ a we derived a parameter (α a ) which is the slope of the linear fit of the log‐log plot of σ a versus λ. This parameter is similar to the Ångstrom exponent used for extinction. The reported α a values for the UV appear as very original data in the literature.