白令海海盆区夏季水团分布及其年际变化  

Distribution and interannual variation of water masses in the Bering Sea basin in summer

作　　者：刘娜[1] 林丽娜[2] 何琰[1] 李涛 孔彬[4] 

机构地区：[1]国家海洋局第一海洋研究所,青岛266061 [2]中国科学院南海海洋研究所,广州510301 [3]中国海洋大学海洋与大气学院,青岛266100 [4]山东科技大学测绘科学与工程学院,青岛266510

出　　处：《科学通报》2016年第13期1478-1487,共10页Chinese Science Bulletin

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

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.The Bering Sea is a marginal sea of the North Pacific located in middle and high latitudes. It can be divided into almost two equal part. The northern one called the Bering Sea Shelf whose depth less than 200 m, meanwhile, the other southwest part is the Bering Basin which is deeper than 3000 m. There is a cyclonic circulation in the basin, which consists of the Kamchatka Current in the west, the Aleutian North Slope Current in the south and the Bering Slope Current in the east. As a transitional area connecting the Pacific Ocean and the Arctic Ocean, the variations of hydrological environment directly affect the properties of Pacific inflow, which not only is the key factor of the Shelf-Slope-Basin system in the west of the Arctic Ocean, but also can expand its impact to the north of Atlantic through the Arctic. What＇s more, the broad Bering Sea is a productive ecosystem that has great economic and cultural value, the changes in the physical environment are capable of reorganizing the ecosystem. In the summers of 1999, 2003, 2008, 2010, 2012 and 2014, a total of six Chinese National Arctic Research Expeditions were carried out. In these researches, the Arctic-Pacific sector has always been the focus, so that many years of hydrographic data were obtained in the Bering Sea basin. Based on the valuable CTD data from the repeated section, which is along the common border shared by the Russia and the America and intersects the whole basin, the distribution and interannual variation of water masses in the Bering Sea basin are analyzed. The results indicate that the water in this area can be divided into three types of water masses based on the differences in temperature and salinity： Bering Sea Basin Upper Water, Bering Sea Basin Intermediate Water, Bering Sea Basin Deep Water. In summer, Bering Sea Basin Upper Water is the warmest water mass in the basin and located at depths 40 m with the highest temperature of 10.9°C in 2008. Its thickness decreases from south to north. Furthermore, there is a marked thermocli

关 键 词：白令海海盆 水团分布 年际变化 北极 

分 类 号：P731.16[天文地球—海洋科学]