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
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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
Li Shihan
中科院分区:
地球科学2区
文献类型:
--
作者:
Hu Shijian;Sprintall Janet;Guan Cong;Hu Dunxin;Wang Fan;Lu Xi;Li Shihan

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2004-2018年Argo观测揭示了热带太平洋温跃层(24-25.5 sigma(theta)等平面)盐度变化的三重模态。热带北太平洋和西南太平洋的温跃层盐度在年际至近十年的时间尺度上与热带东南太平洋的温跃层盐度变化不一致。TMOS是由平均盐度异常平流和平均海流在等压线面上的异常盐度平流引起的。虽然TMOS型与厄尔尼诺-南方涛动(ENSO)或太平洋年代际涛动(PDO)相关的热型有很大不同,但它与ENSO和PDO指数有显著的相关性,并有10个月的滞后时间。露头区盐度异常的等平传播和淡水输入异常也与ENSO和PDO有关,在TMOS的形成中起重要作用。等压线盐度异常的传播速度接近斜压罗斯比波的相速度和纬向流的速度。TMOS的作用是塑造盆地尺度的太平洋水团,并可能在气候中发挥重要作用。
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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