GSTDTAP  > 气候变化
DOI10.1175/JCLI-D-18-0033.1
Weakened Anomalous Western North Pacific Anticyclone during an El Nino-Decaying Summer under a Warmer Climate: Dominant Role of the Weakened Impact of the Tropical Indian Ocean on the Atmosphere
He, Chao1; Zhou, Tianjun2; Li, Tim3
2019
发表期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2019
卷号32期号:1页码:213-230
文章类型Article
语种英语
国家Peoples R China
英文摘要

The western North Pacific subtropical anticyclone (WNPAC) is the most prominent atmospheric circulation anomaly over the subtropical Northern Hemisphere during the decaying summer of an El Nino event. Based on a comparison between the RCP8.5 and the historical experiments of 30 coupled models from the CMIP5, we show evidence that the anomalous WNPAC during the El Nino-decaying summer is weaker in a warmer climate although the amplitude of the El Nino remains generally unchanged. The weakened impact of the sea surface temperature anomaly (SSTA) over the tropical Indian Ocean (TIO) on the atmosphere is essential for the weakened anomalous WNPAC. In a warmer climate, the warm tropospheric temperature (TT) anomaly in the tropical free troposphere stimulated by the El Nino-related SSTA is enhanced through stronger moist adiabatic adjustment in a warmer mean state, even if the SSTA of El Nino is unchanged. But the amplitude of the warm SSTA over TIO remains generally unchanged in an El Nino-decaying summer, the static stability of the boundary layer over TIO is increased, and the positive rainfall anomaly over TIO is weakened. As a result, the warm Kelvin wave emanating from TIO is weakened because of a weaker latent heating anomaly over TIO, which is responsible for the weakened WNPAC anomaly. Numerical experiments support the weakened sensitivity of precipitation anomaly over TIO to local SSTA under an increase of mean-state SST and its essential role in the weakened anomalous WNPAC, independent of any change in the SSTA.


英文关键词Indian Ocean ENSO Sea surface temperature Coupled models Interannual variability
领域气候变化
收录类别SCI-E
WOS记录号WOS:000453367100001
WOS关键词SEA-SURFACE TEMPERATURE ; INTERANNUAL VARIABILITY ; INTERDECADAL VARIATIONS ; SST ANOMALIES ; PART I ; ENSO ; MONSOON ; CMIP5 ; TELECONNECTION ; CAPACITOR
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/19734
专题气候变化
作者单位1.Jinan Univ, Inst Environm & Climate Res, Guangzhou, Guangdong, Peoples R China;
2.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Numer Modeling Atmospher Sci & Geop, Beijing, Peoples R China;
3.Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ, Nanjing, Jiangsu, Peoples R China
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He, Chao,Zhou, Tianjun,Li, Tim. Weakened Anomalous Western North Pacific Anticyclone during an El Nino-Decaying Summer under a Warmer Climate: Dominant Role of the Weakened Impact of the Tropical Indian Ocean on the Atmosphere[J]. JOURNAL OF CLIMATE,2019,32(1):213-230.
APA He, Chao,Zhou, Tianjun,&Li, Tim.(2019).Weakened Anomalous Western North Pacific Anticyclone during an El Nino-Decaying Summer under a Warmer Climate: Dominant Role of the Weakened Impact of the Tropical Indian Ocean on the Atmosphere.JOURNAL OF CLIMATE,32(1),213-230.
MLA He, Chao,et al."Weakened Anomalous Western North Pacific Anticyclone during an El Nino-Decaying Summer under a Warmer Climate: Dominant Role of the Weakened Impact of the Tropical Indian Ocean on the Atmosphere".JOURNAL OF CLIMATE 32.1(2019):213-230.
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