DOI: 10.1002/jgrd.50199
论文题名: Impact of dataset choice on calculations of the short-term cloud feedback
作者: Dessler A.E. ; Loeb N.G.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 7 起始页码: 2821
结束页码: 2826
语种: 英语
Scopus关键词: Atmospheric radiation
; Atmospheric temperature
; Alternative calculations
; Climate variation
; Cloud clearings
; Cloud feedbacks
; Cloud radiative forcing
; Reanalysis
; Surface temperatures
; Top of atmospheres
; Feedback
; clear sky
; climate change
; climate feedback
; data set
; surface temperature
; Terra (satellite)
; top of atmosphere
英文摘要: Dessler [2010, hereafter D10] estimated the magnitude of the cloud feedback in response to short-term climate variations and concluded that it was likely positive, with an average magnitude of +0.50±0.75 W/m2/K. This paper investigates the sensitivity of D10's results to the choice of clear-sky top-of-atmosphere flux (ΔRclear-sky ), surface temperature (ΔTs ), and reanalysis data sets. Most of the alternative ΔRclear-sky data sets produce cloud feedbacks that are close to D10, differing by 0.2-0.3 W/m2/K. An exception is the Terra SSF1deg ΔRclear-sky product, which produces an overall negative cloud feedback. However, a critical examination of those data leads us to conclude that that result is due to problems in the Terra ΔRclear-sky arising from issues with cloud clearing prior to July 2001. Eliminating the problematic early portion yields a cloud feedback in good agreement with D10. We also present an alternative calculation of the cloud feedback that does not require an estimate of ΔRclear-sky , and this calculation also produces a positive cloud feedback in agreement with D10. The various ΔTs data sets produce cloud feedbacks that differ by as much as 0.8 W/m2/K. The choice of reanalysis, used as a source of ΔRclear-sky or as adjustments for the cloud radiative forcing, has a small impact on the inferred cloud feedback. Overall, these results confirm the robustness of D10's estimate of a likely positive feedback. © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1012665
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63831
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; NASA Langley Research Center, Hampton, VA, United States
Recommended Citation:
Dessler A.E.,Loeb N.G.. Impact of dataset choice on calculations of the short-term cloud feedback[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(7)