| TONG Jinlu,CHEN Min,YANG Weifeng,ZHANG Run,PAN Hong,ZHENG Minfang,QIU Yusheng,HU Wangjiang,ZENG Jian. 2017. Accumulation of freshwater in the permanent ice zone of the Canada Basin during summer 2008. Acta Oceanologica Sinica, 36(8):101－108 |
| Accumulation of freshwater in the permanent ice zone of the Canada Basin during summer 2008 |
| 2008年夏季加拿大海盆永久冰区的淡水累积现象 |
| Received:May 27, 2016 |
| DOI：10.1007/s13131-017-1023-1 |
| Key words:18O freshwater river water sea ice melted water Canada Basin |
| 中文关键词: 18O 淡水 河水 海冰融化水 加拿大海盆 |
| 基金项目:The Chinese Polar Environment Comprehensive Investigation & Assessment Program under contract Nos CHINARE2017-03-04-03 and CHINARE2017-04-03-05; the Natural Science Foundation of China under contract No. 41125020. |
| Author Name | Affiliation | E-mail | | TONG Jinlu | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | CHEN Min | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | mchen@xmu.edu.cn | | YANG Weifeng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China | | | ZHANG Run | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | PAN Hong | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | ZHENG Minfang | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | QIU Yusheng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China | | | HU Wangjiang | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | | | ZENG Jian | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China | |
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| Abstract: |
| A combination of δ18O and salinity data was employed to explore the freshwater balance in the Canada Basin in summer 2008. The Arctic river water and Pacific river water were quantitatively distinguished by using different saline end-members. The fractions of total river water, including the Arctic and Pacific river water, were high in the upper 50 m and decreased with depth as well as increasing latitude. In contrast, the fraction of Pacific river water increased gradually with depth but decreased toward north. The inventory of total river water in the Canada Basin was higher than other arctic seas, indicating that Canada Basin was a main storage region for river water in the Arctic Ocean. The fraction of Arctic river water was higher than Pacific river water in the upper 50 m while the opposite was true below 50 m. As a result, the inventories of Pacific river water were higher than those of Arctic river water, demonstrating that the Pacific inflow through the Bering Strait is the main source of freshwater in the Canada Basin. Both the river water and sea-ice melted water in the permanent ice zone were more abundant than those in the region with sea-ice just melted. The fractions of total river water, Arctic river water, Pacific river water increased northward to the north of 82°N, indicating an additional source of river water in the permanent ice zone of the northern Canada Basin. A possible reason for the extra river water in the permanent ice zone is the lateral advection of shelf waters by the Trans-Polar Drift. The penetration depth of sea-ice melted waters was less than 30 m in the southern Canada Basin, while it extended to 125 m in the northern Canada Basin. The inventory of sea-ice melted water suggested that sea-ice melted waters were also accumulated in the permanent ice zone, attributing to the trap of earlier melted waters in the permanent ice zone via the Beaufort Gyre. |
| 中文摘要: |
| 利用海水δ18O和盐度数据，通过运用不同的海水端元特征值，定量区分出北极河流和太平洋入流输送的河水组分，进而开展了2008年夏季加拿大海盆淡水收支平衡状况的研究。在加拿大海盆，包括北极河流和太平洋入流输送的总河水组分份额在50 m以浅水体较高，且随着深度和纬度的增加而降低。与总河水组分不同，太平洋入流河水组分的份额随深度的增加而增加，并随着纬度的增加而降低。加拿大海盆总河水组分的储量高于北冰洋其他海盆，说明加拿大海盆是北冰洋河水组分的主要储藏区域。对于50 m以浅水体，北极河流河水组分的份额高于太平洋入流河水组分，但在50 m以深水体中，情况刚好相反，即太平洋入流河水组分的份额高于北极河流河水组分。综合的结果看，太平洋入流河水组分的储量高于北极河流河水组分，说明通过白令海峡的太平洋入流是加拿大海盆淡水的主要来源。加拿大海盆永久冰区的河水和海冰融化水组分比刚融化区域更为丰富。在82°N以北海域，总河水组分、北极河流河水组分和太平洋入流河水组分的份额往北逐渐增加，显示出加拿大海盆北部海域的永久冰区存在额外的河水来源，这些额外的河水组分可能是通过穿极流将陆架水体水平输送所提供。在加拿大海盆南部海域，海冰融化水的穿透深度小于30 m，而在加拿大海盆北部海域，海冰融化水的穿透深度可达125 m。海冰融化水储量的空间变化显示，永久冰区附近海域累积海冰融化水，可能是由波弗特环流将南部海域早期融化的海冰融化水输运至北部海域并累积形成。 |
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