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DOI | 10.1007/s00382-017-3760-4 |
Alleviating tropical Atlantic sector biases in the Kiel climate model by enhancing horizontal and vertical atmosphere model resolution: climatology and interannual variability | |
Harlass, Jan1; Latif, Mojib1,2; Park, Wonsun1 | |
2018-04-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:2605-2635 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
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. |
英文关键词 | Tropical Atlantic SST bias Benguela Climate modelling Resolution GCM biases |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428600200017 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; EQUATORIAL ATLANTIC ; CIRCULATION ; PACIFIC ; WINDS ; SST ; REANALYSIS ; CMIP5 ; PREDICTION ; ORIGIN |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35284 |
专题 | 气候变化 |
作者单位 | 1.GEOMAR Helmholtz Ctr Ocean Res Kiel, Duesternbrooker Weg 20, D-24105 Kiel, Germany; 2.Univ Kiel, Kiel, Germany |
推荐引用方式 GB/T 7714 | Harlass, Jan,Latif, Mojib,Park, Wonsun. 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,2018,50:2605-2635. |
APA | Harlass, Jan,Latif, Mojib,&Park, Wonsun.(2018).Alleviating tropical Atlantic sector biases in the Kiel climate model by enhancing horizontal and vertical atmosphere model resolution: climatology and interannual variability.CLIMATE DYNAMICS,50,2605-2635. |
MLA | Harlass, Jan,et al."Alleviating tropical Atlantic sector biases in the Kiel climate model by enhancing horizontal and vertical atmosphere model resolution: climatology and interannual variability".CLIMATE DYNAMICS 50(2018):2605-2635. |
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