DOI: 10.1175/JCLI-D-18-0033.1
Scopus记录号: 2-s2.0-85058793736
论文题名: Weakened anomalous western North Pacific anticyclone during an el niño-decaying summer under a warmer climate: Dominant role of the weakened impact of the tropical indian ocean on the atmosphere
作者: He C. ; Zhou T. ; Li T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 1 起始页码: 213
结束页码: 230
语种: 英语
Scopus关键词: Boundary layers
; Oceanography
; Surface waters
; Tropics
; Troposphere
; Atmospheric circulation anomaly
; Numerical experiments
; Positive rainfall anomalies
; Precipitation anomalies
; Sea surface temperature anomalies
; Subtropical anticyclone
; Tropical Indian ocean
; Tropospheric temperature
; Climate models
; air-sea interaction
; anticyclone
; atmospheric circulation
; boundary layer
; El Nino
; Northern Hemisphere
; sea surface temperature
; summer
; temperature anomaly
; Indian Ocean
; Indian Ocean (Tropical)
; Pacific Ocean
; Pacific Ocean (North)
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 Niño 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 Niño-decaying summer is weaker in a warmer climate although the amplitude of the El Niño 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 Niño-related SSTA is enhanced through stronger moist adiabatic adjustment in a warmer mean state, even if the SSTA of El Niño is unchanged. But the amplitude of the warm SSTA over TIO remains generally unchanged in an El Niño-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 WNPACanomaly. Numerical experiments support the weakened sensitivity of precipitation anomaly over TIO to local SSTA under an increase of meanstate SST and its essential role in the weakened anomalous WNPAC, independent of any change in the SSTA. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117270
Appears in Collections: 气候变化与战略
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Recommended Citation:
He C.,Zhou T.,Li T.. Weakened anomalous western North Pacific anticyclone during an el niño-decaying summer under a warmer climate: Dominant role of the weakened impact of the tropical indian ocean on the atmosphere[J]. Journal of Climate,2019-01-01,32(1)