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| Titel |
Long-term aerosol-mediated changes in cloud radiative forcing of deep clouds at the top and bottom of the atmosphere over the Southern Great Plains |
| VerfasserIn |
Hongru Yan, Zhanqing Li, Jianping Huang, Maureen Cribb, Jianjun Liu |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-16), S.7113-7124 |
| Datensatznummer |
250118883
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| Publikation (Nr.) |
 copernicus.org/acp-14-7113-2014.pdf |
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| Zusammenfassung |
| Aerosols can alter the macro- and micro-physical properties of deep
convective clouds (DCCs) and their radiative forcing (CRF). This study
presents what is arguably the first long-term estimate of the
aerosol-mediated changes in CRF (AMCRF) for deep cloud systems derived from
decade-long continuous ground-based and satellite observations, model
simulations, and reanalysis data. Measurements were made at the US Department
of Energy's Atmospheric Radiation Measurement Program's Southern Great Plains
(SGP) site. Satellite retrievals are from the Geostationary Operational
Environmental Satellite. Increases in aerosol loading were accompanied by the
thickening of DCC cores and the expansion and thinning of anvils, due
presumably to the aerosol invigoration effect (AIV) and the aerosol
microphysical effect. Meteorological variables dictating these cloud
processes were investigated. Consistent with previous findings, the AIV is
most significant when the atmosphere is moist and unstable with weak wind
shear. Such aerosol-mediated systematic changes in DCC core thickness and
anvil size alter CRF at the top of atmosphere (TOA) and at the surface. Using
extensive observations, ~300 DCC systems were identified over a 10
years period at the SGP site (2000–2011) and analyzed. Daily mean AMCRF at
the TOA and at the surface are 29.3 W m−2 and 22.2 W m−2,
respectively. This net warming effect due to changes in DCC microphysics
offsets the cooling resulting from the first aerosol indirect effect. |
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