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利用1999,2003,2008,2010,2012和2014年夏季中国6次北极科学考察在白令海海盆区获取的重复断面水文数据,对白令海海盆区水团分类及时空变化特征进行了分析.结果表明,白令海海盆水体主要由高温低盐的白令海海盆上层水、低温的白令海海盆中层水和高盐的白令海海盆深层水组成.其中,白令海海盆上层水主要位于40 m以浅,经向上自南向北厚度逐渐减小,垂向上与中层水之间存在显著的温跃层,跃层强度年际变化显著;白令海海盆中层水主要位于500 m以浅,受白令海陆坡流的影响,在北部陆坡流区有加深加厚的趋势;海盆中层冷水与陆架冷水团同步变化,根据冷水温度和范围差异,可分为冷年和暖年两种状态,且近十几年大致以6 a为周期交替变化.2014年冷水温度最高且范围急剧减小,是否是新一轮暖年的开始还需进一步论证;白令海海盆深层水位于中层水以下,是海盆区体积最大且最稳定的水体,约占总水体体积的80%以上,深层水的温盐范围年际变化较小,维持在较为稳定的状态.北部陆坡流的影响深度可至1000 m.
Using the repeated section hydrographic data obtained from six Arctic scientific expeditions in China in the summer of 1999, 2003, 2008, 2010, 2012 and 2014, we analyzed the water mass classification and its temporal and spatial variation characteristics in the Bering Sea basin. The results show that, The Bering Sea Basin water body is mainly composed of the high temperature and low salt Bering Sea upper water, the low temperature Bering Sea basin middle water and the high salt Bering Sea basin deep water, of which, the upper Bering Sea Basin water is mainly located at 40 m shallow and gradually increases in thickness from south to north And there is a significant thermocline between vertical and middle water, and the annual variation of the thermocline is significant. The middle Bering Sea water is mainly located at a shallow depth of 500 m, influenced by the Bering Sea continental slope flow, and in the northern slope flow area Deepen the thickening trend. The middle-level cold water in the basin changes synchronously with the cold-water mass in the shelf, and can be divided into cold and warm states according to the difference of cold water temperature and range, and alternates with a period of 6 a in the past decade or so.2014 The highest temperature and the scope of the annual cold water temperature decreases sharply. Whether it is the beginning of a new round of warm years needs further proof. The deep water of the Bering Sea basin is below the middle water, The largest and most stable body of water, accounting for more than 80% of the total body of water, the interannual variation of the temperature and salt range of the deep water is small and remains relatively stable. The influence of the northern slope can reach up to 1000 m.