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《Marine Science Bulletin》 2015-01
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T/S distribution and variation in the Pacific based on Argo observations Part Ⅱ: Salinity

ZHANG Chun-ling;XU Jian-ping;College of Marine Sciences, Shanghai Ocean University;Second Institute of Oceanography,SOA;State Key Laboratory of Satellite Oceanography Environment Dynamics,Second Institute of Oceanography, SOA;  
Salinity features and variations from Jan 2004 to Dec 2011 in the Pacific Ocean( 60°S-60°N、 120°E-80°W)are discussed based on the gridded Argo dataset that only assimilates Argo observations by use of objective analysis method.The following results are obtained. There is one high salinity center in the south( about 36.4) and north( near to 35.2)subtropical respectively from the surface to the subsurface(about 150 m). They have a saddle distribution. Their symcenter is not equator but bias about 12°N(for S) to the northern hemisphere. Near the latitude of 40° in the south or north, the Salinity contour is so dense as to form the " front". The water with low salinity invades from south to north in the southeast to New Zealand. It is visible from the surface to 1 000 m deep and exists all the time of the year. In the near polar sea waters, the salinity also has a periodical variation tendency. The near north polar sea water is more obvious with the salinity difference of0.30~0.45. And its highest salinity arises in April and lowest salinity appears in September every year. Below the surface, the periodical variation of Salinity is less evident than that at the surface. Deep to the 500 m, the largest salinity variation range is less than 0.10 in the whole Pacific Ocean. Surface salinity has obvious decreases in 2007 and 2010 respectively in the equatorial. The maximum amplitude is about 0.8. The interannual period is 3 years. In the north subtropical and near polar sea waters, the salinity interannual period is three to six months, with the amplitude of 0.2. And the middle salinity has no obvious variation.
【Fund】: 上海海洋大学科技发展专项(A2-0209-14-200054);; 海洋公益性行业科研专项(2013418032);; 科技基础性工作专项(2012FY112300)
【CateGory Index】: P731.1
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