DOI: 10.1007/s00382-012-1397-x
Scopus记录号: 2-s2.0-84874305399
论文题名: A further assessment of vegetation feedback on decadal Sahel rainfall variability
作者: Kucharski F. ; Zeng N. ; Kalnay E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-05-06 起始页码: 1453
结束页码: 1466
语种: 英语
英文关键词: Climate variability
; Interactive vegetation
; Sahel rainfall
; SST forcing
英文摘要: The effect of vegetation feedback on decadal-scale Sahel rainfall variability is analyzed using an ensemble of climate model simulations in which the atmospheric general circulation model ICTPAGCM ("SPEEDY") is coupled to the dynamic vegetation model VEGAS to represent feedbacks from surface albedo change and evapotranspiration, forced externally by observed sea surface temperature (SST) changes. In the control experiment, where the full vegetation feedback is included, the ensemble is consistent with the observed decadal rainfall variability, with a forced component 60 % of the observed variability. In a sensitivity experiment where climatological vegetation cover and albedo are prescribed from the control experiment, the ensemble of simulations is not consistent with the observations because of strongly reduced amplitude of decadal rainfall variability, and the forced component drops to 35 % of the observed variability. The decadal rainfall variability is driven by SST forcing, but significantly enhanced by land-surface feedbacks. Both, local evaporation and moisture flux convergence changes are important for the total rainfall response. Also the internal decadal variability across the ensemble members (not SST-forced) is much stronger in the control experiment compared with the one where vegetation cover and albedo are prescribed. It is further shown that this positive vegetation feedback is physically related to the albedo feedback, supporting the Charney hypothesis. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54997
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Abdus Salam International Centre for Theoretical Physics, Earth System Physics Section, Strada Costiera 11, 34151 Trieste, Italy; Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, 20742, United States
Recommended Citation:
Kucharski F.,Zeng N.,Kalnay E.. A further assessment of vegetation feedback on decadal Sahel rainfall variability[J]. Climate Dynamics,2013-01-01,40(2017-05-06)