DOI: 10.1007/s00382-017-4052-8
Scopus记录号: 2-s2.0-85039548975
论文题名: Sensitivity of the atmospheric water cycle to corrections of the sea surface temperature bias over southern Africa in a regional climate model
作者: Weber T. ; Haensler A. ; Jacob D.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-07-08 起始页码: 2841
结束页码: 2855
语种: 英语
英文关键词: Atmospheric water cycle
; Okavango River Basin
; Regional climate projections
; Sea surface temperature bias
; Southern Africa
Scopus关键词: atmospheric moisture
; climate modeling
; climate prediction
; correction
; downscaling
; global climate
; moisture transfer
; precipitation assessment
; regional climate
; sea surface temperature
; sensitivity analysis
; Atlantic Ocean
; Atlantic Ocean (Southeast)
; Indian Ocean
; Indian Ocean (Southwest)
; Okavango Basin
英文摘要: Regional climate models (RCMs) have been used to dynamically downscale global climate projections at high spatial and temporal resolution in order to analyse the atmospheric water cycle. In southern Africa, precipitation pattern were strongly affected by the moisture transport from the southeast Atlantic and southwest Indian Ocean and, consequently, by their sea surface temperatures (SSTs). However, global ocean models often have deficiencies in resolving regional to local scale ocean currents, e.g. in ocean areas offshore the South African continent. By downscaling global climate projections using RCMs, the biased SSTs from the global forcing data were introduced to the RCMs and affected the results of regional climate projections. In this work, the impact of the SST bias correction on precipitation, evaporation and moisture transport were analysed over southern Africa. For this analysis, several experiments were conducted with the regional climate model REMO using corrected and uncorrected SSTs. In these experiments, a global MPI-ESM-LR historical simulation was downscaled with the regional climate model REMO to a high spatial resolution of 50 × 50 km2 and of 25 × 25 km2 for southern Africa using a double-nesting method. The results showed a distinct impact of the corrected SST on the moisture transport, the meridional vertical circulation and on the precipitation pattern in southern Africa. Furthermore, it was found that the experiment with the corrected SST led to a reduction of the wet bias over southern Africa and to a better agreement with observations as without SST bias corrections. © 2017, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109071
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Climate Service Center Germany (GERICS), Helmholtz-Zentrum Geesthacht, Fischertwiete 1, Hamburg, 20095, Germany
Recommended Citation:
Weber T.,Haensler A.,Jacob D.. Sensitivity of the atmospheric water cycle to corrections of the sea surface temperature bias over southern Africa in a regional climate model[J]. Climate Dynamics,2018-01-01,51(2018-07-08)