Variation of freshwater components in the Canada Basin during 1967-2010

PAN Hong; CHEN Min; TONG Jinlu; QIU Yusheng; ZHENG Minfang; CAO Jianping

doi:10.1007/s13131-014-0487-5

Variation of freshwater components in the Canada Basin during 1967-2010

doi: 10.1007/s13131-014-0487-5

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

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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- 收稿日期: 2013-01-28
- 修回日期: 2013-04-13

Variation of freshwater components in the Canada Basin during 1967-2010

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

摘要

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-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.
- CanadaBasin /
- freshwater /
- riverrunoff /
- seaicemeltwater /
- oxygenisotope
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.
- Canada Basin /
- freshwater /
- river runoff /
- sea ice meltwater /
- oxygen isotope

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参考文献(39)

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Variation of freshwater components in the Canada Basin during 1967-2010

doi: 10.1007/s13131-014-0487-5

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出版历程

Variation of freshwater components in the Canada Basin during 1967-2010

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出版历程

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