Freshening in the South China Sea during 2012 revealed by Aquarius and in situ data

Freshening in the South China Sea during 2012 revealed by Aquarius and in situ data
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Aquarius 和现场数据揭示了 2012 年南海的清新情况

DOI:
10.1002/2014jc010108
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发表时间:
2014-12
期刊:
J. Geophys. Res. Oceans
影响因子:
--
通讯作者:
D. Wang
D. Wang
中科院分区:
其他
文献类型:
--
作者:
Zeng, L., W. Timothy Liu, H. Xue, P. Xiu,;D. Wang

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来自 Aquarius 的最新海面盐度(SSS)数据与原位水文数据一起用于探索南海(SCS)海面盐度(SSS)的时空特征。以现场观测为参考,对每日 Aquarius 数据进行评估表明,3.0 版本数据集存在 0.45 psu 的负偏差。校正系统偏差后,每日 Aquarius SSS 的均方根差约为 0.53 psu,每周和每月 Aquarius SSS 的均方根差分别为 0.45 和 0.29 psu。尽管如此,水瓶座SSS显示出2012年南海的可靠更新,这比水瓶座的不确定性更大。现场观测证实南海北部上层海洋的新鲜度高达 0.4 psu。 2012年的淡水变化是由于当地丰富的淡水通量和有限的黑潮入侵的综合作用造成的。通过对比2012年和2011年的黑潮入侵,我们发现黑潮的减少是南海北部清新的一个相对重要的原因。与南海北部相比,2012年河流流量减少是导致湄公河口附近地区地表盐分较2011年升高的主要原因。
Newly available sea surface salinity (SSS) data from the Aquarius together with in situ hydrographic data are used to explore the spatial and temporal characteristics of SSS in the South China Sea (SCS). Using in situ observations as the reference, an evaluation of daily Aquarius data indicates that there exists a negative bias of 0.45 psu for the version 3.0 data set. The root-mean-square difference for daily Aquarius SSS is about 0.53 psu after correcting the systematic bias, and those for weekly and monthly Aquarius SSSs are 0.45 and 0.29 psu, respectively. Nevertheless, the Aquarius SSS shows a reliable freshening in the SCS in 2012, which is larger than the Aquarius uncertainty. The freshening of up to 0.4 psu in the upper-ocean of the northern SCS was confirmed by in situ observations. This freshening in 2012 was caused by a combined effect of abundant local freshwater flux and limited Kuroshio intrusion. By comparing the Kuroshio intrusion in 2012 with that in 2011, we found the reduction as a relatively important cause for the freshening over the northern SCS. In contrast to the northern SCS, reduced river discharge in 2012 played the leading role to the saltier surface in the region near the Mekong River mouth with respect to 2011.
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