DOI: 10.1175/JCLI-D-17-0071.1
Scopus记录号: 2-s2.0-85047100952
论文题名: Spatiotemporal variability of the South Pacific convergence zone fresh pool eastern front from coral-derived surface salinity data
作者: Dassié E.P. ; Hasson A. ; Khodri M. ; Lebas N. ; Linsley B.K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 8 起始页码: 3265
结束页码: 3288
语种: 英语
英文关键词: Climate variability
; Interannual variability
; Interdecadal variability
; Oceanic variability
; Pacific decadal oscillation
; Tropical variability
Scopus关键词: Atmospheric pressure
; Climate change
; Salinity measurement
; Time measurement
; Water
; Climate variability
; Inter-decadal variability
; Interannual variability
; Oceanic variabilities
; Pacific decadal oscillation
; Tropical variability
; Lakes
; annual variation
; climate variation
; convergence
; decadal variation
; El Nino-Southern Oscillation
; Pacific Decadal Oscillation
; sea surface salinity
; spatiotemporal analysis
; tropical meteorology
; Cook Islands
; Fiji
; Pacific Ocean
; Pacific Ocean (South)
; Rarotonga
; Tonga
; Anthozoa
英文摘要: Direct observations indicate a southeastward expansion of the South Pacific convergence zone (SPCZ) fresh pool and a freshening trend since the 1970s. Understanding decadal and longer-term variability of the SPCZ fresh pool and of the salinity front located at its southeastern margin has been limited by the scarcity of instrumental sea surface salinity (SSS) measurements. This study uses coral δ18O as a proxy for SSS to extend the salinity record back to the 1880s, from three different locations across the SSS front: Fiji, Tonga, and Rarotonga (FTR region). High percentages of observed SSS variance are explained by multicoral δ18O mean composite at each site. At the interannual time scale, the salinity front displacement over the last 200 years follows the El Niño-Southern Oscillation (ENSO) index. The different El Niño flavors are observable in the amplitude of the salinity front interannual displacement. However, no significant changes in either the frequency or the amplitude of its displacements were observed. At longer time scales, the timing and magnitude of the freshening trend vary among sites. The earliest freshening onset of about -0.06 psu decade-1 is detected in Fiji (around 1865), then Rarotonga (around 1939), and Tonga (around 1982). The role of atmospheric freshwater fluxes on SSS variability is evaluated by comparing coral SSS to historical precipitation data. The results suggest that, despite the known influence of the interdecadal Pacific oscillation (IPO) negative phases on increasing atmospheric freshwater fluxes and lowering SSS in the FTR region, ocean dynamics has a dominant influence at decadal time scale and in the onset of freshening trends. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111593
Appears in Collections: 气候减缓与适应
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作者单位: Laboratoire d'Océanographie et du Climat: Experimentations et Approches Numeriques, LOCEAN-IPSL, UMR 7159 Sorbonne Université/IRD/CNRS/MNHN, Université Pierre et Marie Curie, Paris, France; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Laboratoire d'Océanographie et du Climat: Experimentations et Approches Numeriques, LOCEAN-IPSL, UMR 7159 CNRS/UPMC/IRD, Université Pierre et Marie Curie, Paris, France
Recommended Citation:
Dassié E.P.,Hasson A.,Khodri M.,et al. Spatiotemporal variability of the South Pacific convergence zone fresh pool eastern front from coral-derived surface salinity data[J]. Journal of Climate,2018-01-01,31(8)