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| Titel |
Clear-sky direct aerosol radiative forcing variations over mega-city Delhi |
| VerfasserIn |
S. Singh, K. Soni, T. Bano, R. S. Tanwar, S. Nath, B. C. Arya |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 5 ; Nr. 28, no. 5 (2010-05-21), S.1157-1166 |
| Datensatznummer |
250016834
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1157-2010.pdf |
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| Zusammenfassung |
| The direct aerosol radiative forcing (DARF) has been estimated for the
clear-sky conditions over Delhi from January 2006 to January 2007 using
Santa Barbara DISORT Atmospheric Radiative Transfer model (SBDART) in the
wavelength range 300–3000 nanometer. The single scattering albedo (SSA) and
the asymmetry parameter used in this model were estimated using the Optical
Properties of Aerosol and Cloud (OPAC) model. The annual average AOD
observed at 500 nm was ~0.86±0.42 with an average Angstrom
exponent ~0.68±0.35. The average monthly AOD throughout the
year over Delhi was found to be in the range 0.56 to 1.22 with the Angstrom
exponent in the range 0.38 to 0.96. A high monthly average BC concentration
in the range 4–15 μg m−3 led to monthly average SSA in the range
0.90±0.4 to 0.74±0.3 during the year. Consequently, the monthly
average clear-sky DARF at the surface was found to vary in the range −46±8 W m−2
to −110±20 W m−2, at TOA in the range −1.4±0.4 to 21±2 W m−2, whereas in the atmosphere it was in the
range 46±9 W m−2 to 115±19 W m−2 throughout the year.
As the dust concentration in the atmosphere was highest (May–June) the SSA
showed an increase with wavelength however when dust concentration was low
the SSA decreased with the wavelength. |
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