| PAN Hong,CHEN Min,TONG Jinlu,QIU Yusheng,ZHENG Minfang,CAO Jianping. 2014. Variation of freshwater components in the Canada Basin during 1967-2010. Acta Oceanologica Sinica, 33(6):40－45 |
| Variation of freshwater components in the Canada Basin during 1967-2010 |
| Variation of freshwater components in the Canada Basin during 1967-2010 |
| Received:January 28, 2013 Revised:April 13, 2013 |
| DOI：10.1007/s13131-014-0487-5 |
| Key words:Canada Basin freshwater river runoff sea ice meltwater oxygen isotope |
| 中文关键词: Canada Basin freshwater river runoff sea ice meltwater oxygen isotope |
| 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. |
| Author Name | Affiliation | E-mail | | PAN Hong | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | CHEN Min | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | mchen@xmu.edu.cn | | TONG Jinlu | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | QIU Yusheng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | ZHENG Minfang | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | CAO Jianping | College of Ocean and Earth Sciences, 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. |
| 中文摘要: |
| 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. |
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