Ocean salinity changes in the northwest Pacific subtropical gyre: the quasi-decadal oscillation and the freshening trend
Ocean salinity changes in the northwest Pacific subtropical gyre: the quasi-decadal oscillation and the freshening trend
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西北太平洋副热带环流海洋盐度变化：准年代际振荡与清新趋势
DOI：
10.1002/2014jc010536
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发表时间：
2015-03
期刊：
影响因子：
--
通讯作者：
Guangchen Si
中科院分区：
文献类型：
--
作者：
Fei Yu;Huijie Xue;Ran Wang;Guangchen Si
海洋盐度的变化在调节海洋和气候变异性方面发挥着重要作用。通过对沿着PN、TK和137 ° E剖面的重复观测资料分析，发现1987-2012年西北太平洋副热带环流（NPSG）表层和次表层盐度均存在明显的近10年准年代际振荡（QDO）和持续的淡化趋势。NPSG的表面盐度在1989年、1999年和2008年达到低谷，并在1993年和2003年达到峰值。表层盐度振荡的峰坚韧幅度可达0.3psu。1987 - 2012年，表层盐度下降约0.10 psu，呈现出-0.0042 psu/yr（-1）的淡化趋势。这些表层盐度异常主要在沿着黑潮延伸体的通气带内俯冲到次表层，并在NPSG上空平流输送。次表层盐度最大值（S-max）的QDO比表层盐度的QDO滞后约1 ~ 2年。S-max振荡的峰坚韧幅度（0.15 psu）和变淡趋势（-0.0036 psu yr（-1））均小于表层盐度。NPSG的盐度变化可能始于20世纪70年代中期，与1976/1977年期间的北太平洋体制转变有关。混合层盐度收支分析表明，NPSG海气淡水通量的变化是控制表层盐度异常的主导因素，大尺度海洋环流（地转平流）的变化也起次要作用。NPSG的盐度和海气淡水通量变化都与太平洋年代际振荡密切相关，反映了大尺度的海气相互作用。
Ocean salinity changes play an important role in modulating ocean and climate variability. Analyses of the repeating observations along PN, TK, and 137 degrees E sections reveal that both surface and subsurface salinity in the Northwest Pacific Subtropical Gyre (NPSG) had clear quasi-decadal oscillation (QDO) of approximate to 10 year and a sustained freshening trend during 1987-2012. Surface salinity in the NPSG troughed in 1989, 1999, and 2008, and peaked in 1993, and 2003. The peak-to-tough range of surface salinity oscillation can reach 0.3 psu. Meanwhile, surface salinity decreased about 0.10 psu from 1987 to 2012 with a freshening trend of -0.0042 psu yr(-1). These surface salinity anomalies were subducted into the subsurface layer mainly in the ventilated zone along the Kuroshio Extension, and advected over the NPSG. The QDO of the subsurface salinity maximum (S-max) lagged that of the surface salinity by about 1 approximate to 2 years. Both the peak-to-tough range of the S-max oscillation (0.15 psu) and its freshening trend (-0.0036 psu yr(-1)) are smaller than those of the surface salinity. Salinity changes in the NPSG likely began in the mid-1970s associated with the North Pacific regime shift during 1976/1977. Analyses of mixed layer salinity budget indicated that air-sea freshwater flux change in the NPSG is the leading factor controlling the surface salinity anomalies, while change of large-scale ocean circulation (Geostrophic advection) also plays a minor role. Salinity and air-sea freshwater flux changes in the NPSG are all closely related to the Pacific Decadal Oscillation, indicating the large-scale ocean-atmosphere interaction.
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影响因子：
4.1
作者：
T. Suga;A. Kato;K. Hanawa
通讯作者：
T. Suga;A. Kato;K. Hanawa
影响因子：
3.5
作者：
Youfang Yan;E. Chassignet;Y. Qi;W. Dewar
通讯作者：
Youfang Yan;E. Chassignet;Y. Qi;W. Dewar
DOI：
10.1016/j.dsr2.2009.12.005
发表时间：
2010-07
影响因子：
3
作者：
L. Ren;S. Riser
通讯作者：
L. Ren;S. Riser
影响因子：
2.3
作者：
Yuanlong Li;Fan Wang
通讯作者：
Yuanlong Li;Fan Wang
影响因子：
--
作者：
L. Ren;S. Riser
通讯作者：
L. Ren;S. Riser