Eastern Pacific ITCZ Dipole and ENSO Diversity
文献类型：期刊论文
| 作者 | Xie, SP; Peng, QH; Kamae, Y; Zheng, XT; Tokinaga, H; Wang, DX |
| 刊名 | JOURNAL OF CLIMATE
 |
| 出版日期 | 2018 |
| 卷号 | 31期号:11页码:4449-4462 |
| 通讯作者 | sxie@ucsd.edu |
| 英文摘要 | The eastern tropical Pacific features strong climatic asymmetry across the equator, with the intertropical convergence zone (ITCZ) displaced north of the equator most of time. In February- April (FMA), the seasonal warming in the Southern Hemisphere and cooling in the Northern Hemisphere weaken the climatic asymmetry, and a double ITCZ appears with a zonal rainband on either side of the equator. Results from an analysis of precipitation variability reveal that the relative strength between the northern and southern ITCZ varies from one year to another and this meridional seesaw results from ocean-atmosphere coupling. Surprisingly this meridional seesaw is triggered by an El Nino-Southern Oscillation (ENSO) of moderate amplitudes. Although ENSO is originally symmetric about the equator, the asymmetry in the mean climate in the preceding season introduces asymmetric perturbations, which are then preferentially amplified by coupled ocean-atmosphere feedback in FMA when deep convection is sensitive to small changes in cross-equatorial gradient of sea surface temperature. This study shows that moderate ENSO follows a distinct decay trajectory in FMA and southeasterly cross-equatorial wind anomalies cause moderate El Nino to dissipate rapidly as southeasterly cross-equatorial wind anomalies intensify ocean upwelling south of the equator. In contrast, extreme El Nino remains strong through FMA as enhanced deep convection causes westerly wind anomalies to intrude and suppress ocean upwelling in the eastern equatorial Pacific. |
| 学科主题 | Meteorology & Atmospheric Sciences |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/17072]  |
| 专题 | 南海海洋研究所_热带海洋环境国家重点实验室(LTO) |
| 推荐引用方式 GB/T 7714 | Xie, SP,Peng, QH,Kamae, Y,et al. Eastern Pacific ITCZ Dipole and ENSO Diversity[J]. JOURNAL OF CLIMATE,2018,31(11):4449-4462. |
| APA | Xie, SP,Peng, QH,Kamae, Y,Zheng, XT,Tokinaga, H,&Wang, DX.(2018).Eastern Pacific ITCZ Dipole and ENSO Diversity.JOURNAL OF CLIMATE,31(11),4449-4462. |
| MLA | Xie, SP,et al."Eastern Pacific ITCZ Dipole and ENSO Diversity".JOURNAL OF CLIMATE 31.11(2018):4449-4462. |
入库方式： OAI收割
来源：南海海洋研究所
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