Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0071.1 |
Spatiotemporal Variability of the South Pacific Convergence Zone Fresh Pool Eastern Front from Coral-Derived Surface Salinity Data | |
Dassie, Emilie P.1; Hasson, Audrey2; Khodri, Myriam2; Lebas, Nicolas2; Linsley, Braddock K.3 | |
2018-04-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:8页码:3265-3288 |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA |
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 O-18 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 O-18 mean composite at each site. At the interannual time scale, the salinity front displacement over the last 200 years follows the El Nino-Southern Oscillation (ENSO) index. The different El Nino 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. |
英文关键词 | Climate variability Interannual variability Interdecadal variability Oceanic variability Pacific decadal oscillation Tropical variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428694000017 |
WOS关键词 | TROPICAL PACIFIC ; ISOTOPE RECORDS ; CLIMATE VARIABILITY ; OCEAN ; TEMPERATURE ; OSCILLATION ; ENSO ; DELTA-O-18 ; SR/CA ; RECONSTRUCTION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/20959 |
专题 | 气候变化 |
作者单位 | 1.Univ Paris 06, LOCEAN, IPSL, UMR 7159,Sorbonne Univ,IRD,CNRS,MNHN, Paris, France; 2.Univ Paris 06, LOCEAN, IPSL, UMR 7159,CNRS,IRD, Paris, France; 3.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA |
推荐引用方式 GB/T 7714 | Dassie, Emilie P.,Hasson, Audrey,Khodri, Myriam,et al. Spatiotemporal Variability of the South Pacific Convergence Zone Fresh Pool Eastern Front from Coral-Derived Surface Salinity Data[J]. JOURNAL OF CLIMATE,2018,31(8):3265-3288. |
APA | Dassie, Emilie P.,Hasson, Audrey,Khodri, Myriam,Lebas, Nicolas,&Linsley, Braddock K..(2018).Spatiotemporal Variability of the South Pacific Convergence Zone Fresh Pool Eastern Front from Coral-Derived Surface Salinity Data.JOURNAL OF CLIMATE,31(8),3265-3288. |
MLA | Dassie, Emilie P.,et al."Spatiotemporal Variability of the South Pacific Convergence Zone Fresh Pool Eastern Front from Coral-Derived Surface Salinity Data".JOURNAL OF CLIMATE 31.8(2018):3265-3288. |
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