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Different Influences of Two El Nino Types on Low-Level Atmospheric Circulation over the Subtropical Western North Pacific
Tan, Wei1,2; Wei, Zexun2; Liu, Qiang1; Fu, Qingjun1; Chen, Mengyan3,4; Li, Bingtian1; Li, Juan1
2020
Source PublicationJOURNAL OF CLIMATE
ISSN0894-8755
Volume33Issue:3Pages:825
AbstractThis study focuses on different evolutions of the low-level atmospheric circulations between eastern Pacific (EP) El Nino and central Pacific-II (CP-II) El Nino. The western North Pacific anomalous anticyclone (WNPAC) originates from the northern South China Sea for EP El Nino, and moves to the western North Pacific (WNP) afterward. Compared with EP El Nino, the origin of the WNPAC is farther west during CP-II El Nino, with the center over the Indochina Peninsula. Moreover, the WNPAC shows a weaker eastward shift. Such discrepancies are attributed to different evolutions of the cyclonic response over the WNP, which can suppress the convection in the western flank of the anomalous cyclone. The eastward retreat of the anomalous cyclone is significant for EP El Nino, but less evident for CP-II El Nino. These discrepancies are related to zonal evolutions of the increased precipitation over the equatorial Pacific. Following the southward migration of the intertropical convergence zone (ITCZ), the deep-convection region extends eastward along the equator, reinforcing the atmospheric response to the eastern Pacific warming in EP El Nino. For CP-II El Nino, the atmospheric response is insignificant over the eastern Pacific without warming. Moreover, the meridional migration of the ITCZ can modulate zonal variations of the easterly trade wind and specific humidity as well. Due to the combined effects of the climatological background and atmospheric anomalies, the specific humidity-induced and wind-induced moist enthalpy advection contribute to different shifts of the precipitation center.
DepartmentLTO
KeywordTropics El Nino ENSO Anticyclones Atmosphere-ocean interaction Air-sea interaction
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/18353
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Minist Nat Resources, Inst Oceanog 1, Qingdao, Shandong, Peoples R China
2.Shandong Univ Sci & Technol, Ocean Sci & Engn Coll, Qingdao, Shandong, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Reg Oceanog & Numer Modeling, Qingdao, Shandong, Peoples R China
4.Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Tan, Wei,Wei, Zexun,Liu, Qiang,et al. Different Influences of Two El Nino Types on Low-Level Atmospheric Circulation over the Subtropical Western North Pacific[J]. JOURNAL OF CLIMATE,2020,33(3):825, 846.
APA Tan, Wei.,Wei, Zexun.,Liu, Qiang.,Fu, Qingjun.,Chen, Mengyan.,...&Li, Juan.(2020).Different Influences of Two El Nino Types on Low-Level Atmospheric Circulation over the Subtropical Western North Pacific.JOURNAL OF CLIMATE,33(3),825.
MLA Tan, Wei,et al."Different Influences of Two El Nino Types on Low-Level Atmospheric Circulation over the Subtropical Western North Pacific".JOURNAL OF CLIMATE 33.3(2020):825.
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