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DOI | 10.1002/2017JD028156 |
Explaining the Year-to-Year Variability of the Eastern Pacific Intertropical Convergence Zone in the Boreal Spring | |
Yu, Haiyang1; Zhang, Minghua1,2 | |
2018-04-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:8页码:3847-3856 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | The year-to-year variability of the Intertropical Convergence Zone (ITCZ) in the eastern tropical Pacific is a significant phenomenon of the tropical climate system. Asymmetric interannual variation of precipitation on two sides of the Equator is often observed there in the boreal spring. We introduce a simple normalized asymmetric index and a double ITCZ index as well as a hierarchical clustering method to describe the ITCZ variation based on the tropical boreal spring precipitation from 1979 to 2017. We show that the indices and the clustering method give consistent categorization of asymmetric ITCZ variation. We find that the asymmetry of precipitation can be explained by the remote impact of the interannual variability of the central Pacific sea surface temperature (SST) on the horizontal gradient of surface pressure and surface wind convergence, especially the Modoki mode. The central Pacific SST also remotely modulates free-tropospheric temperature and vertical stability in the eastern equatorial Pacific, but this remote impact is secondary to the wind convergence. Interannual variability of local SST south of the Equator plays little role in the precipitation variability, which is supported by numerical experiments with a regional atmospheric model. Results imply that surface wind convergence should be considered in convection schemes to improve the simulation of precipitation in the eastern tropical Pacific in climate models. Plain Language Summary The year-to-year variability of the Intertropical Convergence Zone in the eastern tropical Pacific is a significant phenomenon of the tropical climate system. Maximum precipitation in the boreal spring can be located north of the Equator, south of the Equator, or along the Equator. This study explains why there is such variability in the Intertropical Convergence Zone from 1year to the other. The remote impact of the large-scale spatial pattern of the sea surface temperature is found to be the cause. |
英文关键词 | ITCZ Modoki mode remote impact interannual variation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000433071200001 |
WOS关键词 | DOUBLE ITCZ ; SOUTHERN-OSCILLATION ; TROPICAL PACIFIC ; EL-NINO ; ENSO ; OCEAN ; GRADIENTS ; ENSEMBLE ; CLIMATE ; MODELS |
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/33826 |
专题 | 气候变化 |
作者单位 | 1.SUNY Stony Brook, Sch Marine & Atmospher Sci, Stony Brook, NY 11794 USA; 2.Chinese Acad Sci, Int Ctr Climate & Environm Sci IAP, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Yu, Haiyang,Zhang, Minghua. Explaining the Year-to-Year Variability of the Eastern Pacific Intertropical Convergence Zone in the Boreal Spring[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(8):3847-3856. |
APA | Yu, Haiyang,&Zhang, Minghua.(2018).Explaining the Year-to-Year Variability of the Eastern Pacific Intertropical Convergence Zone in the Boreal Spring.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(8),3847-3856. |
MLA | Yu, Haiyang,et al."Explaining the Year-to-Year Variability of the Eastern Pacific Intertropical Convergence Zone in the Boreal Spring".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.8(2018):3847-3856. |
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