DOI: 10.5194/cp-11-175-2015
Scopus记录号: 2-s2.0-84922444602
论文题名: North African vegetation-precipitation feedback in early and mid-Holocene climate simulations with CCSM3-DGVM
作者: Rachmayani R. ; Prange M. ; Schulz M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 2 起始页码: 175
结束页码: 185
语种: 英语
Scopus关键词: climate feedback
; climate modeling
; Holocene
; latent heat flux
; phase equilibrium
; precipitation assessment
; simulation
; vegetation cover
; water budget
; North Africa
英文摘要: The present study analyses the sign, strength, and working mechanism of the vegetation-precipitation feedback over North Africa in middle (6 ka BP) and early Holocene (9 ka BP) simulations using the comprehensive coupled climate-vegetation model CCSM3-DGVM (Community Climate System Model version 3 and a dynamic global vegetation model). The coupled model simulates enhanced summer rainfall and a northward migration of the West African monsoon trough along with an expansion of the vegetation cover for the early and middle Holocene compared to the pre-industrial period. It is shown that dynamic vegetation enhances the orbitally triggered summer precipitation anomaly by approximately 20% in the Sahara-Sahel region (10-25° N, 20° W-30° E) in both the early and mid-Holocene experiments compared to their fixed-vegetation counterparts. The primary vegetation-rainfall feedback identified here operates through surface latent heat flux anomalies by canopy evaporation and transpiration and their effect on the mid-tropospheric African easterly jet, whereas the effects of vegetation changes on surface albedo and local water recycling play a negligible role. Even though CCSM3-DGVM simulates a positive vegetation-precipitation feedback in the North African region, this feedback is not strong enough to produce multiple equilibrium climate-ecosystem states on a regional scale. © 2015 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49180
Appears in Collections: 气候变化与战略
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Recommended Citation:
Rachmayani R.,Prange M.,Schulz M.. North African vegetation-precipitation feedback in early and mid-Holocene climate simulations with CCSM3-DGVM[J]. Climate of the Past,2015-01-01,11(2)