白令海海盆区夏季水团分布及其年际变化

发布时间：2018-07-05 07:31

本文选题：白令海海盆 + 水团分布　；参考：《科学通报》2016年13期

【摘要】：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.
[Abstract]:Based on the hydrological data of repeated sections obtained in the Bering Sea basin area during the summer of 2012 and 2014, the classification and temporal and spatial variation characteristics of water masses in the Bering Sea basin are analyzed. The results show that the water body of the Bering Sea basin is mainly composed of the upper water of the Bering Sea basin with high temperature and low salt, the middle water of the low temperature sea basin and the deep water of the high salt Bering sea basin. Among them, the upper water of the Bering Sea basin is mainly located at a shallow distance of 40 m, and the thickness of the upper layer decreases gradually from south to north, and there is a significant thermocline between vertical and middle water, and the annual variation of the strength of the cline is remarkable. The middle water of the Bering Sea basin is mainly located at 500 m shallow, affected by the Bering Sea continental slope current, and has a tendency of deepening thickening in the northern slope current region, and the intermediate cold water in the basin changes synchronously with the shelf cold water mass, according to the difference of cold water temperature and range, It can be divided into two states: cold year and warm year, and in recent ten years, the period is about 6 years. The temperature of cold water in 2014 is the highest and the range decreases sharply, so whether it is the beginning of the new round of warm year still needs to be further demonstrated. The deep water in the Bering Sea basin is the largest and most stable water body in the basin, accounting for more than 80% of the total water body volume. The temperature and salt range of the deep water is relatively small and maintained in a relatively stable state. The influence depth of the northern slope flow can reach 1000 m.
【作者单位】：国家海洋局第一海洋研究所;中国科学院南海海洋研究所;中国海洋大学海洋与大气学院;山东科技大学测绘科学与工程学院;
【基金】：南北极环境综合考察与评估专项(CHINARE2015-03-01,CHINARE2015-04-03) 海洋公益性行业科研专项(201205007) 国家海洋局第一海洋研究所2014年度基本科研业务费专项(2014T02)资助
【分类号】：P731.16

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