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| Titel |
Ground-based remote sensing of aerosol optical properties and their radiative impacts in PRD region of China |
| VerfasserIn |
Boru Mai, Xue Jiao Deng, Zhanqing Li, Fei Li, Yu Zou, Tao Deng, Xiantong Liu |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113977
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| Publikation (Nr.) |
 EGU/EGU2015-14227.pdf |
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| Zusammenfassung |
| Aerosol direct effects on surface irradiance were explored by using 7 years’ ground-based
broadband and spectral radiation data at Panyu, the main site of atmospheric composition
monitoring in Pearl River Delta (PRD) . Aerosol optical properties were derived from a Sun
photometer, and the radiations were calculated by SBDART model. Results demonstrated that
in dry seasons(from October to next February), the annual mean aerosol optical depth (AOD)
at 550nm was 0.535, and more than 60% AOD was in a range of 0.2-0.6. Due to the
fact that few dust taken place in PRD region, the course mode of weak or strong
absorbing aerosol was negligible. However, the proportion of fine mode, weak radiation
absorbing particle was about 9.52%, with the Angstrom exponent (α440/470) = 1.30,
single scatter co-albedo (ω0) =0.04.Up to 90% of the aerosol was dominated by fine
mode, strong absorbing particles, as given by mean α440/470 = 1.35, ω0 =0.14.
Because of strong absorption, the variations in aerosol concentration significantly
heated the air, and cooled down the surface. The annual mean shortwave direct
radiation forcing at the surface (SFC), inside the atmosphere (ATM), and at the top of
atmosphere (TOA) was -33.51 |
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