DOI: 10.1007/s00382-017-3760-4
Scopus记录号: 2-s2.0-85020719289
论文题名: Alleviating tropical Atlantic sector biases in the Kiel climate model by enhancing horizontal and vertical atmosphere model resolution: climatology and interannual variability
作者: Harlaß J. ; Latif M. ; Park W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-07-08 起始页码: 2605
结束页码: 2635
语种: 英语
英文关键词: Benguela
; Climate modelling
; GCM biases
; Resolution
; SST bias
; Tropical Atlantic
Scopus关键词: annual variation
; atmospheric modeling
; climate modeling
; climatology
; general circulation model
; intertropical convergence zone
; sea surface temperature
; seasonal variation
; Angola
; Atlantic Ocean
; Atlantic Ocean (Tropical)
; Benguela
英文摘要: We investigate the quality of simulating tropical Atlantic (TA) sector climatology and interannual variability in integrations of the Kiel climate model (KCM) with varying atmosphere model resolution. The ocean model resolution is kept fixed. A reasonable simulation of TA sector annual-mean climate, seasonal cycle and interannual variability can only be achieved at sufficiently high horizontal and vertical atmospheric resolution. Two major reasons for the improvements are identified. First, the western equatorial Atlantic westerly surface wind bias in spring can be largely eliminated, which is explained by a better representation of meridional and especially vertical zonal momentum transport. The enhanced atmospheric circulation along the equator in turn greatly improves the thermal structure of the upper equatorial Atlantic with much reduced warm sea surface temperature (SST) biases. Second, the coastline in the southeastern TA and steep orography are better resolved at high resolution, which improves wind structure and in turn reduces warm SST biases in the Benguela upwelling region. The strongly diminished wind and SST biases at high atmosphere model resolution allow for a more realistic latitudinal position of the intertropical convergence zone. Resulting stronger cross-equatorial winds, in conjunction with a shallower thermocline, enable a rapid cold tongue development in the eastern TA in boreal spring. This enables simulation of realistic interannual SST variability and its seasonal phase locking in the KCM, which primarily is the result of a stronger thermocline feedback. Our findings suggest that enhanced atmospheric resolution, both vertical and horizontal, could be a key to achieving more realistic simulation of TA climatology and interannual variability in climate models. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109344
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker Weg 20, Kiel, 24105, Germany; Kiel University, Kiel, Germany
Recommended Citation:
Harlaß J.,Latif M.,Park W.. Alleviating tropical Atlantic sector biases in the Kiel climate model by enhancing horizontal and vertical atmosphere model resolution: climatology and interannual variability[J]. Climate Dynamics,2018-01-01,50(2018-07-08)