Observed Triple Mode of Salinity Variability in the Thermocline of Tropical Pacific Ocean
Observed Triple Mode of Salinity Variability in the Thermocline of Tropical Pacific Ocean
复制标题
热带太平洋温跃层盐度变异三重模式的观测
DOI:
10.1029/2020jc016210
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发表时间:
2020-09
影响因子:
3.6
通讯作者:
Li Shihan
中科院分区:
文献类型:
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作者:
Hu Shijian;Sprintall Janet;Guan Cong;Hu Dunxin;Wang Fan;Lu Xi;Li Shihan
A well-defined Triple MOde of Salinity (TMOS) variability in the tropical Pacific thermocline layer (24-25.5 sigma(theta)isopycnal surfaces) is revealed from the Argo observations during 2004-2018. Thermocline salinity in the tropical northern and southwestern Pacific Ocean varies out of phase on interannual to near-decadal time scales with that in the tropical southeastern Pacific Ocean. The TMOS is attributed to anomalous advection of mean salinity as well as advection of anomalous salinity by the mean oceanic current on isopycnal surfaces. While the TMOS pattern is quite different from the thermal patterns associated with the El Nino-Southern Oscillation (ENSO) or the Pacific Decadal Oscillation (PDO), it is significantly associated with the ENSO and PDO indices with a time lag of 10 months. Isopycnal propagation of salinity anomalies and anomalous freshwater input in the outcropping region, also both associated with ENSO and PDO, are important in the formation of TMOS. The propagation speed of isopycnal salinity anomalies is close to documented phase speeds of baroclinic Rossby waves and velocities of zonal currents. The TMOS acts to shape the basin-scale Pacific water masses and potentially plays an important role in climate.
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影响因子:
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通讯作者:
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影响因子:
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