| LIU Na,LIN Lina,WANG Yingjie,CHEN Hongxia,HE Yan. 2016. The distribution and inter-annual variation of water masses on the Bering Sea shelf in summer. Acta Oceanologica Sinica, 35(11):59－67 |
| The distribution and inter-annual variation of water masses on the Bering Sea shelf in summer |
| 白令海陆架区夏季水文分布特征及年际变化 |
| Received:September 30, 2015 Revised:November 09, 2015 |
| DOI：10.1007/s13131-016-0948-0 |
| Key words:Bering Sea shelf water mass inter-annual variation Chinese National Arctic Research Expedition |
| 中文关键词: 白令海陆架 水团 年际变化 中国北极科学考察 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | LIU Na | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIN Lina | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | linln@fio.org.cn | | WANG Yingjie | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | CHEN Hongxia | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | HE Yan | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| 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℃, 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. |
| 中文摘要: |
| 利用2003、2008、2010、2012和2014年夏季中国第2次至第6次北极科学考察获取的CTD调查数据，对白令海中部和北部陆架区主要水文特征进行了分析，明确了主要水团分类并研究了水团的年际变化特征。在中部陆架区，从陆坡区到阿拉斯加沿岸依次分布着四种水团，分别为白令海陆架水（BSW）、白令海陆坡流水（BSCW）、混合变性水（MW）和阿拉斯加沿岸水（ACW），其中BSW在夏季又分为陆架表层暖水和陆架冷水团（BSW_C）。靠近白令海峡的白令海北部陆架区，ACW、BSW和阿纳德尔水（AW）共存。两个区域水团有明显的时空变化。在中部陆架区，BSCW是盐度最高的水团，主要占据177°W以西，2014年盐度最高；BSW_C是温度最低的水团，2014年温度最高；ACW是盐度最低的水团，主要占据170°W以东，2012年温度和盐度最高。在靠近白令海峡的白令海北部陆架，AW位于西侧，是北部陆架区盐度最高的水团，与中部陆架的BSCW相比，温度急剧降低。在向北运动的过程中，AW有向东扩展的趋势；ACW位于东侧，通常与BSW呈上下分布，虽然仍是盐度最低的水团，但与中部陆架相比，盐度略有增加，2014年盐度最高；BSW位于AW与ACW之间，2012年温度最低，但是中部陆架温度低于0℃的BSW_C在北部陆架并没有出现。尽管中部和北部陆架的水文特征有很多差异，但陆架区对气候变化的响应是同步的，可以分为暖年（2003，2014）和冷年（2008，2010，2012）两种类型。2014年有可能是新一轮暖年的开始。 |
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