DOI: 10.1002/2015GL064853
论文题名: Feedback processes responsible for El Niño-La Niña amplitude asymmetry
作者: Im S.-H. ; An S.-I. ; Kim S.T. ; Jin F.-F.
刊名: Geophysical Research Letters
ISSN: 0094-9558
EISSN: 1944-9289
出版年: 2015
卷: 42, 期: 13 起始页码: 5556
结束页码: 5563
语种: 英语
英文关键词: amplitude asymmetry
; Bjerknes stability index
; El Niño-La Niña asymmetry
; ENSO feedback
; nonlinear wind response
Scopus关键词: Atmospheric temperature
; Climate change
; Damping
; Feedback
; Heat flux
; Nonlinear feedback
; Oceanography
; Stress analysis
; Surface waters
; amplitude asymmetry
; Atmospheric pattern
; Enhanced sensitivity
; Feedback process
; Non-linear response
; Sea surface temperature anomalies
; Stability indices
; Wind response
; Nickel
; amplitude
; asymmetry
; damping
; El Nino-Southern Oscillation
; La Nina
; latent heat flux
; nonlinearity
; sea surface temperature
; temperature anomaly
英文摘要: To analyze El Niño-La Niña asymmetry, Bjerknes Stability Index analysis applied separately for El Niño and La Niña events. The growth rate of the El Niño is larger than that of the La Niña. Their difference is mainly due to an increased positive dynamical feedback. The enhanced sensitivity of the ocean's dynamic response to wind stress in El Niño is a primary cause for the increase in the positive dynamical feedbacks and is originated from the nonlinear response of atmospheric pattern to sea surface temperature (SST) anomalies, in particular the eastward shift of maximum wind loading and the equator-confined wind patch during El Niño. The sensitivity of the wind intensity to SST anomalies is larger during El Niño; however, its impact is not greater than others. Difference in the negative feedbacks is mainly attributed to the damping by shortwave feedback, with the latent heat flux feedback being a secondary contributor. Key Points Larger El Niño is due to the larger ocean dynamic sensitivity to SST forcing Ocean response to SST is related to the nonlinearity of wind's pattern to SST Larger damping of El Niño is mainly due to shortwave feedback. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938125464&doi=10.1002%2f2015GL064853&partnerID=40&md5=9e9f23a9f3f66e837955bb59be171319
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9173
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea
Recommended Citation:
Im S.-H.,An S.-I.,Kim S.T.,et al. Feedback processes responsible for El Niño-La Niña amplitude asymmetry[J]. Geophysical Research Letters,2015-01-01,42(13).