| Variation of freshwater components in the Canada Basin during 1967–2010 |
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| 作者姓名： | PAN Hong CHEN Min TONG Jinlu QIU Yusheng ZHENG Minfang CAO Jianping |
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| 作者单位： | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China |
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| 基金项目： | The Chinese Polar Environment Comprehensive Investigation and Assessment Programs under contract Nos CHINARE2014-03-04-03 and CHINARE2013-04-03-05; the National Natural Science Foundation of China under contract No. 41125020; the 4th Chinese Arctic Research Program; a special scientific research project for public welfare supported by the State Oceanic Administration under contract No. 201105022-4. |
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| 摘 要： | As a conservative tracer, oxygen isotopes in seawater are widely used for water mass analysis, along with temperature and salinity. In this study, seawater oxygen-18 datasets in the Canada Basin during 1967–2010 were obtained from the four cruises of the Chinese National Arctic Research Expedition(1999, 2003, 2008, and 2010) and the NASA database. Fractions of sea ice meltwater and river runoff were determined from the salinity-18O system. Our results showed that the river runoff decreased from the south to the north in the Canada Basin. The enhanced amount of river runoff observed in the southern Canada Basin may originate from the Mackenzie River, transported by the Beaufort Gyre. The river runoff component showed maximum fractions during 1967–1969, 1978–1979, 1984–1985, 1993–1994, and 2008–2010, indicating the refresh time of the river runoff was 5.0–16.0 a in the Canada Basin. The temporal variation of the river runoff was related to the change of the Arctic Oscillation(AO) index, suggesting the freshwater stored in the Canada Basin was affected by surface sea ice drift and water mass movement driven by atmospheric circulation.
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| 关 键 词： | 加拿大海盆 淡水 成分 美国航空航天局 河流径流量 北极科学考察 河川径流 时间变化 |
| 收稿时间： | 2013/1/28 0:00:00 |
| 修稿时间： | 2013/4/13 0:00:00 |
Variation of freshwater components in the Canada Basin during 1967-2010 |
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| PAN Hong,CHEN Min,TONG Jinlu,QIU Yusheng,ZHENG Minfang,CAO Jianping.Variation of freshwater components in the Canada Basin during 1967-2010[J].Acta Oceanologica Sinica,2014,33(6):40-45. |
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| Authors: | PAN Hong CHEN Min TONG Jinlu QIU Yusheng ZHENG Minfang and CAO Jianping |
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| Institution: | 1.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China2.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China |
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| Abstract: | As a conservative tracer, oxygen isotopes in seawater are widely used for water mass analysis, along with temperature and salinity. In this study, seawater oxygen-18 datasets in the Canada Basin during 1967–2010 were obtained from the four cruises of the Chinese National Arctic Research Expedition (1999, 2003, 2008, and 2010) and the NASA database. Fractions of sea ice meltwater and river runoff were determined from the salinity-δ18O system. Our results showed that the river runoff decreased from the south to the north in the Canada Basin. The enhanced amount of river runoff observed in the southern Canada Basin may originate from the Mackenzie River, transported by the Beaufort Gyre. The river runoff component showed maximum fractions during 1967–1969, 1978–1979, 1984–1985, 1993–1994, and 2008–2010, indicating the refresh time of the river runoff was 5.0–16.0 a in the Canada Basin. The temporal variation of the river runoff was related to the change of the Arctic Oscillation (AO) index, suggesting the freshwater stored in the Canada Basin was affected by surface sea ice drift and water mass movement driven by atmospheric circulation. |
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| Keywords: | Canada Basin freshwater river runoff sea ice meltwater oxygen isotope |
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