Twentieth century Walker Circulation change: data analysis and model experiments
文献类型：期刊论文
| 作者 | Meng, Qingjia1,2,3; Latif, Mojib1; Park, Wonsun1; Keenlyside, Noel S.1; Semenov, Vladimir A.1,4; Martin, Thomas1 |
| 刊名 | CLIMATE DYNAMICS
 |
| 出版日期 | 2012-05-01 |
| 卷号 | 38期号:9-10页码:1757-1773 |
| 关键词 | Tropical atmospheric circulation Twentieth century Walker Circulation |
| ISSN号 | 0930-7575 |
| 通讯作者 | Latif, M (reprint author), Leibniz Inst Meereswissensch, D-24105 Kiel, Germany. |
| 英文摘要 | Recent studies indicate a weakening of the Walker Circulation during the twentieth century. Here, we present evidence from an atmospheric general circulation model (AGCM) forced by the history of observed sea surface temperature (SST) that the Walker Circulation may have intensified rather than weakened. Observed Equatorial Indo-Pacific Sector SST since 1870 exhibited a zonally asymmetric evolution: While the eastern part of the Equatorial Pacific showed only a weak warming, or even cooling in one SST dataset, the western part and the Equatorial Indian Ocean exhibited a rather strong warming. This has resulted in an increase of the SST gradient between the Maritime Continent and the eastern part of the Equatorial Pacific, one driving force of the Walker Circulation. The ensemble experiments with the AGCM, with and without time-varying external forcing, suggest that the enhancement of the SST gradient drove an anomalous atmospheric circulation, with an enhancement of both Walker and Hadley Circulation. Anomalously strong precipitation is simulated over the Indian Ocean and anomalously weak precipitation over the western Pacific, with corresponding changes in the surface wind pattern. Some sensitivity to the forcing SST, however, is noticed. The analysis of twentieth century integrations with global climate models driven with observed radiative forcing obtained from the Coupled Model Intercomparison Project (CMIP) database support the link between the SST gradient and Walker Circulation strength. Furthermore, control integrations with the CMIP models indicate the existence of strong internal variability on centennial timescales. The results suggest that a radiatively forced signal in the Walker Circulation during the twentieth century may have been too weak to be detectable. |
| 学科主题 | Meteorology & Atmospheric Sciences |
| 收录类别 | SCI |
| 原文出处 | 10.1007/s00382-011-1047-8 |
| 语种 | 英语 |
| WOS记录号 | WOS:000303448300005 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/12202]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 作者单位 | 1.Leibniz Inst Meereswissensch, D-24105 Kiel, Germany 2.Chinese Res Inst Environm Sci, River & Coastal Environm Res Ctr, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 4.Russian Acad Sci, AM Obukhov Inst Atmospher Phys, Moscow, Russia |
| 推荐引用方式 GB/T 7714 | Meng, Qingjia,Latif, Mojib,Park, Wonsun,et al. Twentieth century Walker Circulation change: data analysis and model experiments[J]. CLIMATE DYNAMICS,2012,38(9-10):1757-1773. |
| APA | Meng, Qingjia,Latif, Mojib,Park, Wonsun,Keenlyside, Noel S.,Semenov, Vladimir A.,&Martin, Thomas.(2012).Twentieth century Walker Circulation change: data analysis and model experiments.CLIMATE DYNAMICS,38(9-10),1757-1773. |
| MLA | Meng, Qingjia,et al."Twentieth century Walker Circulation change: data analysis and model experiments".CLIMATE DYNAMICS 38.9-10(2012):1757-1773. |
入库方式： OAI收割
来源：海洋研究所
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