Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3799-2 |
Mean-state dependence of ENSO atmospheric feedbacks in climate models | |
Bayr, Tobias1; Latif, Mojib2; Dommenget, Dietmar3; Wengel, Christian1; Harlass, Jan1; Park, Wonsun1 | |
2018-05-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:3171-3194 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Australia |
英文摘要 | We investigate the dependence of ENSO atmospheric feedbacks on the mean-state in a perturbed atmospheric physics ensemble with the Kiel Climate Model (KCM) and in CMIP5 models. Additionally, uncoupled simulations are conducted with the atmospheric component of the KCM to obtain further insight into the mean-state dependence. It is found that the positive zonal wind feedback and the negative heat flux feedback, with the short-wave flux as dominant component, are strongly linearly related through sea surface temperature (SST) and differences in model physics are less important. In observations, strong zonal wind and heat flux feedbacks are caused by a convective response in the western central equatorial Pacific (Nio4 region), resulting from an eastward (westward) shift of the rising branch of the Walker Circulation (WC) during El Nio (La Nia). Many state-of-the-art climate models exhibit an equatorial cold SST bias in the Nio4 region, i.e. are in a La Nia-like mean-state. Therefore they simulate a too westward located rising branch of the WC (by up to 30A degrees) and only a weak convective response. Thus, the position of the WC determines the strength of both the amplifying wind and usually damping heat flux feedback, which also explains why biases in these two feedbacks partly compensate in many climate models. Furthermore, too weak atmospheric feedbacks can cause quite different ENSO dynamics than observed, while enhanced atmospheric feedbacks lead to a substantial improvement of important ENSO properties such as seasonal ENSO phase locking and asymmetry between El Nio and La Nia. Differences in the mean-state SST are suggested to be a major source of ENSO diversity in current climate models. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429650700004 |
WOS关键词 | EL-NINO ; MULTIMODEL ; PACIFIC ; NONLINEARITY ; VARIABILITY ; CIRCULATION ; ASYMMETRY |
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/36438 |
专题 | 气候变化 |
作者单位 | 1.GEOMAR Helmholtz Ctr Ocean Res, Dusternbrooker Weg 20, D-24105 Kiel, Germany; 2.Univ Kiel, Cluster Excellence Future Ocean, D-24105 Kiel, Germany; 3.Monash Univ, Sch Math Sci, Clayton, Vic, Australia |
推荐引用方式 GB/T 7714 | Bayr, Tobias,Latif, Mojib,Dommenget, Dietmar,et al. Mean-state dependence of ENSO atmospheric feedbacks in climate models[J]. CLIMATE DYNAMICS,2018,50:3171-3194. |
APA | Bayr, Tobias,Latif, Mojib,Dommenget, Dietmar,Wengel, Christian,Harlass, Jan,&Park, Wonsun.(2018).Mean-state dependence of ENSO atmospheric feedbacks in climate models.CLIMATE DYNAMICS,50,3171-3194. |
MLA | Bayr, Tobias,et al."Mean-state dependence of ENSO atmospheric feedbacks in climate models".CLIMATE DYNAMICS 50(2018):3171-3194. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论