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| Titel |
Analysis on the impact of aerosol optical depth on surface solar radiation in the Shanghai megacity, China |
| VerfasserIn |
J. Xu, C. Li, H. Shi, Q. He, L. Pan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 7 ; Nr. 11, no. 7 (2011-04-06), S.3281-3289 |
| Datensatznummer |
250009592
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| Publikation (Nr.) |
 copernicus.org/acp-11-3281-2011.pdf |
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| Zusammenfassung |
| This study investigated the decadal variation of the direct surface solar
radiation (DiSR) and the diffuse surface solar radiation (DfSR) during
1961–2008 in the Shanghai megacity as well as their relationships to Aerosol
Optical Depth (AOD) under clear-sky conditions. Three successive periods
with unique features of long term variation of DiSR were identified for both
clear-sky and all-sky conditions: a "dimming" period from the late 1960s
to the mid 1980s, a "stabilization"/"slight brightening" period from the
mid 1980s to the mid 1990s, and a "renewed dimming" period thereafter.
During the two dimming periods of DiSR, DfSR brightened significantly under
clear-sky conditions, indicating that change in atmospheric transparency
resulting from aerosol emission has an important role on decadal variation
of surface solar radiation (SSR) over this area. The analysis on the
relationship between the Moderate-resolution Imaging Spectroradiometer
(MODIS) retrieved AOD and the corresponding hourly measurements of DiSR and
DfSR under clear-sky conditions clearly revealed that AOD is significantly
correlated and anti-correlated with DfSR and DiSR, respectively, both above
99% confidence in all seasons, indicating the great impact of aerosols on
SSR through absorption and/or scattering in the atmosphere. In addition,
both AOD and the corresponding DiSR and DfSR measured during the satellite
passage over Shanghai show obvious weekly cycles. On weekends, AOD is lower
than the weekly average, corresponding to higher DiSR and lower DfSR, while
the opposite pattern was true for weekdays. Less AOD on weekends due to the
reduction of transportation and industrial activities results in enhancement
of atmospheric transparency under cloud free conditions so as to increase
DiSR and decrease DfSR simultaneously. Results show that aerosol loading
from the anthropogenic emissions is an important modulator for the long term
variation of SSR in Shanghai. |
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