Resurfacing of South Pacific Tropical Water in the Equatorial Pacific and Its Variability Associated with ENSO
Resurfacing of South Pacific Tropical Water in the Equatorial Pacific and Its Variability Associated with ENSO
复制标题
赤道太平洋南太平洋热带水域的重铺及其与 ENSO 相关的变化
DOI：
10.1175/jpo-d-16-0078.1
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发表时间：
2017
影响因子：
3.5
通讯作者：
Gao Shan
中科院分区：
文献类型：
--
作者：
Qu Tangdong;Gao Shan
模拟被动示踪剂的结果分析证实了南太平洋热带水在赤道太平洋的重新浮出水面。在积分期间（1993-2011年），赤道太平洋重新出现的南太平洋热带水的体积和重心与厄尔尼诺-南方涛动（ENSO）密切相关，它们与厄尔尼诺-3.4指数的相关性分别达到-0.79和0.84。它们与海面盐度指数Niño-S34.8的相关性（-0.75和0.85）也很高。特别有趣的是，无论是体积和重心的南太平洋热带水的重新浮出水面高峰提前约3个月的ENSO指数。在年际时间尺度上，南太平洋热带水的表面再造可能会调节赤道太平洋的海面盐度，其速率相当于25%的表面淡水通量。结果表明，南太平洋热带水的表面重建直接有助于赤道太平洋的海表盐度变化，并可能在ENSO演变中发挥作用。
Analysis of results from a simulated passive tracer confirms the resurfacing of South Pacific Tropical Water in the equatorial Pacific. Over the period of integration (1993–2011), both the volume and barycenter of the South Pacific Tropical Water that resurfaces in the equatorial Pacific are tightly linked to El Niño–Southern Oscillation (ENSO), with their correlation with the Niño-3.4 index reaching −0.79 and 0.84, respectively. Their correlation (−0.75 and 0.85) with the sea surface salinity index, Niño-S34.8, is also high. Of particular interest is that both the volume and barycenter of the resurfacing South Pacific Tropical Water peak earlier than the ENSO indices by about 3 months. On the interannual time scale, the resurfacing of South Pacific Tropical Water may modulate the sea surface salinity in the equatorial Pacific at a rate equivalent to as much as 25% of the surface freshwater flux. The results suggest that the resurfacing of South Pacific Tropical Water directly contributes to the sea surface salinity variability in the equatorial Pacific and potentially plays a role in ENSO evolution.