DOI: 10.1175/JCLI-D-14-00426.1
Scopus记录号: 2-s2.0-84949770032
论文题名: The role of clouds in modulating global aerosol direct radiative effects in spaceborne active observations and the community earth system model
作者: Matus A.V. ; L'Ecuyer T.S. ; Kay J.E. ; Hannay C. ; Lamarque J.-F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 8 起始页码: 2986
结束页码: 3003
语种: 英语
Scopus关键词: Clouds
; Optical properties
; Regional planning
; Uncertainty analysis
; Aerosol distribution
; Aerosol properties
; Earth system model
; Optical properties of aerosols
; Radiative effects
; Regional analysis
; Seasonal distributions
; Stratocumulus clouds
; Aerosols
; aerosol
; biomass burning
; CALIPSO
; cloud cover
; cloud radiative forcing
; CloudSat
; stratocumulus
; Africa
; Atlantic Ocean
; Atlantic Ocean (Southeast)
; Pacific Ocean
; Pacific Ocean (Southeast)
英文摘要: Observational benchmarks of global and regional aerosol direct radiative effects, over all surfaces and all sky conditions, are generated using CloudSat's new multisensor radiative fluxes and heating rates product. Improving upon previous techniques, the approach leverages the capability of CloudSat and CALIPSO to retrieve vertically resolved estimates of cloud and aerosol properties required for complete and accurate assessment of aerosol direct effects under all conditions. The global annually averaged aerosol direct radiative effect is estimated to be 21.9Wm-2 with an uncertainty range of 60.6Wm-2, which is in better agreement with previously published estimates from global models than previous satellite-based estimates. Detailed comparisons against a fully coupled simulation of the Community Earth System Model, however, reveal that this agreement on the global annual mean masks large regional discrepancies between modeled and observed estimates of aerosol direct effects. A series of regional analyses demonstrate that, in addition to previously documented biases in simulated aerosol distributions, the magnitude and sign of these discrepancies are often related to model biases in the geographic and seasonal distribution of clouds. A low bias in stratocumulus cloud cover over the southeastern Pacific, for example, leads to an overestimate of the radiative effects of marine aerosols in the region. Likewise, errors in the seasonal cycle of low clouds in the southeastern Atlantic distort the radiative effects of biomass burning aerosols from southern Africa. These findings indicate that accurate assessment of aerosol direct effects requires models to correctly represent not only the source, strength, optical properties of aerosols, but their relative proximity to clouds as well. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50865
Appears in Collections: 气候变化事实与影响
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作者单位: University of Wisconsin-Madison, Madison, WI, United States; University of Colorado Boulder, Boulder, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Matus A.V.,L'Ecuyer T.S.,Kay J.E.,et al. The role of clouds in modulating global aerosol direct radiative effects in spaceborne active observations and the community earth system model[J]. Journal of Climate,2015-01-01,28(8)