gchange  > 气候变化与战略
DOI: 10.1175/JCLI-D-18-0209.1
Scopus ID: 2-s2.0-85061784718
Title:
Contributions of atmosphere-ocean interaction and low-frequency variation to intensity of strong El Niño events since 1979
Author: Li X.; Hu Z.-Z.; Huang B.
Source Publication: Journal of Climate
ISSN: 8948755
Indexed By: SCI ; SCI-E ; EI
Publishing Year: 2019
Volume: 32, Issue:5
pages begin: 1381
pages end: 1394
Language: 英语
Scopus Keyword: Atmospheric thermodynamics ; Stream flow ; Surface waters ; Time measurement ; Atmosphere-ocean coupling ; Atmosphere-ocean interactions ; Atmospheric anomaly ; Different time scale ; Eastern equatorial Pacific ; Interannual time scale ; Low-frequency variations ; Sea surface temperature anomalies ; Oceanography
English Abstract: Evolutions of oceanic and atmospheric anomalies in the equatorial Pacific during four strong El Niños (1982/83, 1991/92, 1997/98, and 2015/16) since 1979 are compared. The contributions of the atmosphere-ocean coupling to El Niño-associated sea surface temperature anomalies (SSTA) are identified and their association with low-level winds as well as different time-scale variations is examined. Although overall SSTA in the central and eastern equatorial Pacific is strongest and comparable in the 1997/98 and 2015/16 El Niños, the associated subsurface ocean temperature as well as deep convection and surface wind stress anomalies in the central and eastern equatorial Pacific are weaker during 2015/16 than that during 1997/98. That may be associated with a variation of the wind-SST and wind-thermocline interactions. Both the wind-SST and wind-thermocline interactions play a less important role during 2015/16 than during 1997/98. Such differences are associated with the differences of the low-level westerly wind as well as the contribution of different time-scale variations in different events. Similar to the interannual time-scale variation, the intraseasonal- interseasonal time-scale component always has positive contributions to the intensity of all four strong El Niños. Interestingly, the role of the interdecadal-trend time-scale component varies with event. The contribution is negligible during the 1982/83 El Niño, negative during the 1997/98 El Niño, and positive during the 1991/92 and 2015/16 El Niños. Thus, in addition to the atmosphere-ocean coupling at intraseasonal to interannual time scales, interdecadal and longer time-scale variations may play an important and sometimes crucial role in determining the intensity of El Niño. © 2019, American Meteorological Society.
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Document Type: 期刊论文
Identifier: http://119.78.100.177/globalchange/handle/2HF3EXSE/117200
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Recommended Citation:
Li X.,Hu Z.-Z.,Huang B.. Contributions of atmosphere-ocean interaction and low-frequency variation to intensity of strong El Niño events since 1979[J]. Journal of Climate,2019-01-01,32(5)
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