DOI: 10.1002/2013GL057828
论文题名: Biophysical responses near equatorial islands in the Western Pacific Ocean during El Niño/La Niña transitions
作者: Gierach M.M. ; Messié M. ; Lee T. ; Karnauskas K.B. ; Radenac M.-H.
刊名: Geophysical Research Letters
ISSN: 0094-8463
EISSN: 1944-8194
出版年: 2013
卷: 40, 期: 20 起始页码: 5473
结束页码: 5479
语种: 英语
英文关键词: biophysical response
; El Niño/La Niña transitions
; equatorial islands
; western equatorial Pacific
Scopus关键词: Barrier layer thickness
; Biological response
; biophysical response
; equatorial islands
; Equatorial Pacific
; Equatorial Pacific Ocean
; Physical conditions
; Physical mechanism
; Stream flow
; Blooms (metal)
; algal bloom
; chlorophyll a
; El Nino
; euphotic zone
; island
; La Nina
; thermocline
; upwelling
; vertical mixing
; wind forcing
; Gilbert Islands
; Kiribati
; Pacific Ocean
; Pacific Ocean (Equatorial)
英文摘要: The biological response in the western equatorial Pacific Ocean during El Niño/La Niña transitions and the underlying physical mechanisms were investigated. A chlorophyll a bloom was observed near the Gilbert Islands during the 2010 El Niño/La Niña transition, whereas no bloom was observed during the 2007 El Niño/La Niña transition. Compared to the previously observed bloom during the 1998 El Niño/La Niña transition, the 2010 bloom was weaker, lagged by 1-2 months, and was displaced eastward by ∼200 km. Analysis suggested that the occurrence, magnitude, timing, and spatial pattern of the blooms were controlled by two factors: easterly winds in the western equatorial Pacific during the transition to La Niña and the associated island mass effect that enhanced vertical processes (upwelling and vertical mixing), and the preconditioning of the thermocline depth and barrier layer thickness by the preceding El Niño that regulated the efficiency of the vertical processes. Despite the similar strength of easterly winds in the western equatorial Pacific during the 1998 and 2010 transitions to La Niña, the 2009-2010 El Niño prompted a deeper thermocline and thicker barrier layer than the 1997-1998 El Niño that hampered the efficiency of the vertical processes in supplying nutrients from the thermocline to the euphotic zone, resulting in a weaker bloom. Key Points Chl a blooms near the Gilbert Islands during some El Nino/La Nina transitions Distinct physical conditions are necessary for blooms to occur in this region Ocean preconditioning from El Nino and wind forcing from La Nina control blooms ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84886550934&doi=10.1002%2f2013GL057828&partnerID=40&md5=5cdd7ec5af719cca1b8d6dac6a08482a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5727
Appears in Collections: 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, California Institute of Technology, M/S 300-323, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
Recommended Citation:
Gierach M.M.,Messié M.,Lee T.,et al. Biophysical responses near equatorial islands in the Western Pacific Ocean during El Niño/La Niña transitions[J]. Geophysical Research Letters,2013-01-01,40(20).