The distribution and inter-annual variation of water masses on the Bering Sea shelf in summer
The distribution and inter-annual variation of water masses on the Bering Sea shelf in summer
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DOI：
10.1007/s13131-016-0948-0
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发表时间：
2016-11
影响因子：
1.4
通讯作者：
Na Liu;Lina Lin;Yingjie Wang;Hongxia Chen;Yan He
中科院分区：
文献类型：
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作者：
Na Liu;Lina Lin;Yingjie Wang;Hongxia Chen;Yan He
利用2003年、2008年、2010年、2012年和2014年夏季中国第二次至第六次国家北极科考考察队在白令海陆架内获得的CTD资料，分析了白令海陆架中部和北部水团的分类和年际变化。结果表明，两区在水文特征上既有联系又有差异。在白令海陆架中部，从阿拉斯加斜坡到海岸有序分布的水团主要有四种：白令海坡流水（BSCW）、混合水（MW）、白令海陆架水（BSW）和阿拉斯加海岸水（ACW）。夏季，白令海峡海水可分为白令海峡地表水（BSW_S）和白令海峡冷水（BSW_C）。在白令海峡附近的白令海陆架北部，它从西向东包含阿纳德尔水（AW）， BSW和ACW。但各地区的时空特征也很显著。在中部大陆架，BSCW盐度最高，位于177°W以西，2014年盐度最高。BSW_C是2014年最冷的水团和最热的水团；ACW最新鲜，主要位于170°W以东，2012年温度和盐度最高。北方白令海货架上在白令海峡附近,AW咸与温度急剧下降而BSCW中央架子上。在向北移动至白令海峡的过程中，AW呈现向东扩张的趋势。ACW是最新鲜的，但比中央大陆架上的ACW更咸，后者通常位于BSW上方，2014年是最咸的。2012年BSW分布在AW和ACW之间，最冷，但北部大陆架不存在温度低于0℃的中部大陆架BSW_C冷水。虽然变化如此之多，但两个区域对气候变化的响应是同步的，可分为温暖年（2003年和2014年）和寒冷年（2008年、2010年和2012年）。2014年可能是一个新的暖期的开始。
On the basis of the CTD data obtained within the Bering Sea shelf by the Second to Sixth Chinese National Arctic Research Expedition in the summers of 2003, 2008, 2010, 2012 and 2014, the classification and interannual variation of water masses on the central Bering Sea shelf and the northern Bering Sea shelf are analyzed. The results indicate that there are both connection and difference between two regions in hydrological features. On the central Bering Sea shelf, there are mainly four types of water masses distribute orderly from the slope to the coast of Alaska: Bering Slope Current Water (BSCW), MW (Mixed Water), Bering Shelf Water (BSW) and Alaska Coastal Water (ACW). In summer, BSW can be divided into Bering Shelf Surface Water (BSW_S) and Bering Shelf Cold Water (BSW_C). On the northern Bering Sea shelf near the Bering Strait, it contains Anadyr Water (AW), BSW and ACW from west to east. But the spatial-temporal features are also remarkable in each region. On the central shelf, the BSCW is saltiest and occupies the west of 177°W, which has the highest salinity in 2014. The BSW_C is the coldest water mass and warmest in 2014; the ACW is freshest and mainly occupies the east of 170°W, which has the highest temperature and salinity in 2012. On the northern Bering Sea shelf near the Bering Strait, the AW is saltiest with temperature decreasing sharply compared with BSCW on the central shelf. In the process of moving northward to the Bering Strait, the AW demonstrates a trend of eastward expansion. The ACW is freshest but saltier than the ACW on the central shelf, which is usually located above the BSW and is saltiest in 2014. The BSW distributes between the AW and the ACW and coldest in 2012, but the cold water of the BSW_C on the central shelf, whose temperature less than 0°C, does not exist on the northern shelf. Although there are so many changes, the respond to a climate change is synchronized in the both regions, which can be divided into the warm years (2003 and 2014) and cold years (2008, 2010 and 2012). The year of 2014 may be a new beginning of warm period.