DOI: 10.1007/s00382-011-1280-1
Scopus记录号: 2-s2.0-84864393928
论文题名: Effect of surface albedo, water vapour, and atmospheric aerosols on the cloud-free shortwave radiative budget in the Arctic
作者: Di Biagio C. ; di Sarra A. ; Eriksen P. ; Ascanius S.E. ; Muscari G. ; Holben B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 3 起始页码: 953
结束页码: 969
语种: 英语
英文关键词: Arctic amplification
; Arctic radiative balance
; Atmospheric aerosols
; Direct radiative forcing
; Surface albedo
; Water vapour
英文摘要: This study is based on ground-based measurements of downward surface shortwave irradiance (SW), columnar water vapour (wv), and aerosol optical depth (τ) obtained at Thule Air Base (Greenland) in 2007-2010, together with MODIS observations of the surface shortwave albedo (A). Radiative transfer model calculations are used in combination with measurements to separate the radiative effect of A (ΔSWA), wv (ΔSWwv), and aerosols (ΔSWτ) in modulating SW in cloud-free conditions. The shortwave radiation at the surface is mainly affected by water vapour absorption, which produces a reduction of SW as low as -100 Wm-2 (-18%). The seasonal change of A produces an increase of SW by up to +25 Wm-2 (+4.5%). The annual mean radiative effect is estimated to be -(21-22) Wm-2 for wv, and +(2-3) Wm-2 for A. An increase by +0.065 cm in the annual mean wv, to which corresponds an absolute increase in ΔSWwv by 0.93 Wm-2 (4.3%), has been observed to occur between 2007 and 2010. In the same period, the annual mean A has decreased by -0.027, with a corresponding decrease in ΔSWA by 0.41 Wm-2 (-14.9%). Atmospheric aerosols produce a reduction of SW as low as -32 Wm-2 (-6.7%). The instantaneous aerosol radiative forcing (RFτ) reaches values of -28 Wm-2 and shows a strong dependency on surface albedo. The derived radiative forcing efficiency (FEτ) for solar zenith angles between 55° and 70° is estimated to be (-120.6 ± 4.3) for 0.1 < A < 0.2, and (-41.2 ± 1.6) Wm-2 for 0.5 < A < 0.6. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55248
Appears in Collections: 过去全球变化的重建
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作者单位: ENEA, Laboratory for Earth Observations and Analyses, Via Anguillarese 301, 00123 Rome, Italy; Department of Earth Science, University of Siena, Siena, Italy; DMI, Danish Meteorological Institute, Danish Climate Centre, Lyngbyvej 100, 2100 Copenhagen, Denmark; DMI, Danish Meteorological Institute, Qaanaaq, Greenland; INGV, Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States
Recommended Citation:
Di Biagio C.,di Sarra A.,Eriksen P.,et al. Effect of surface albedo, water vapour, and atmospheric aerosols on the cloud-free shortwave radiative budget in the Arctic[J]. Climate Dynamics,2012-01-01,39(3)