Eastern Pacific ITCZ Dipole and ENSO Diversity
Xie, SP; Peng, QH; Kamae, Y; Zheng, XT; Tokinaga, H; Wang, DX; sxie@ucsd.edu
2018
发表期刊JOURNAL OF CLIMATE
卷号31期号:11页码:4449-4462
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.
部门归属[Xie, Shang-Ping; Kamae, Youichi] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; [Xie, Shang-Ping; Zheng, Xiao-Tong] Ocean Univ China, Phys Oceanog Lab, Qingdao, Peoples R China; [Xie, Shang-Ping; Zheng, Xiao-Tong] Qingdao Natl Lab Marine Sci & Technol, Qingdao, Peoples R China; [Peng, Qihua; Wang, Dongxiao] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Peng, Qihua] Univ Chinese Acad Sci, Beijing, Peoples R China; [Kamae, Youichi] Univ Tsukuba, Fac Life & Environm Sci, Tsukuba, Ibaraki, Japan; [Tokinaga, Hiroki] Kyoto Univ, Hakubi Ctr Adv Res, Uji, Kyoto, Japan; [Tokinaga, Hiroki] Kyoto Univ, Disaster Prevent Res Inst, Uji, Kyoto, Japan
学科领域Meteorology & Atmospheric Sciences
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17072
专题热带海洋环境国家重点实验室(LTO)
通讯作者sxie@ucsd.edu
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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.,...&sxie@ucsd.edu.(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.
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