| HU Wangjiang,CHEN Min,YANG Weifeng,ZHANG Run,QIU Yusheng,ZHENG Minfang. 2014. Low 210Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea. Acta Oceanologica Sinica, 33(6):28－39 |
| Low 210Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea |
| Low 210Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea |
| Received:January 25, 2013 Revised:April 13, 2013 |
| DOI：10.1007/s13131-014-0486-6 |
| Key words:210Pb halocline Canadian Basin Chukchi Sea |
| 中文关键词: 210Pb halocline Canadian Basin Chukchi Sea |
| 基金项目:The Chinese Polar Environment Comprehensive Investigation and Assessment Programs under contract No. CHINARE2014-03-04-03; the National Natural Science Foundation of China under contract No. 41125020; the 4th Chinese Arctic Research Program; the Polar Science Strategic Research Foundation of China under contract No. 20120307. |
| Author Name | Affiliation | E-mail | | HU Wangjiang | 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 | | YANG Weifeng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | ZHANG Run | 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 | |
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| Abstract: |
| 210Pb was measured during the 3rd Chinese National Arctic Research Expedition cruise to investigate its spatial pattern in the western Arctic Ocean, as well as its relation with the thermocline in the Canadian Basin. The specific activities varied from 0.04 to 2.72, <0.013 to 4.37, and 0.1 to 4.85 Bq/m3 for dissolved, particulate, and bulk 210Pb, respectively, corresponding to respective averages of 0.65, 0.43, and 1.08 Bq/m3. In the Canadian Basin, the minimum 210Pb activities occurred in the thermocline, which was characterized by low temperature of-1.52℃ and salinity of 33.1. Combining the spatial distribution of 210Pb and hydrographical characteristics in the western Arctic Ocean, this scenario was ascribed to the effective scavenging of 210Pb when the Pacific water flowed across the Chukchi Shelf. Quantitatively, this interpretation was supported by both the shorter residence times and higher scavenging efficiencies (SE) of dissolved 210Pb over the Chukchi Shelf. The highest SE values were observed in the Herald Shoal and bottom waters over the slope. |
| 中文摘要: |
| 210Pb was measured during the 3rd Chinese National Arctic Research Expedition cruise to investigate its spatial pattern in the western Arctic Ocean, as well as its relation with the thermocline in the Canadian Basin. The specific activities varied from 0.04 to 2.72, <0.013 to 4.37, and 0.1 to 4.85 Bq/m3 for dissolved, particulate, and bulk 210Pb, respectively, corresponding to respective averages of 0.65, 0.43, and 1.08 Bq/m3. In the Canadian Basin, the minimum 210Pb activities occurred in the thermocline, which was characterized by low temperature of-1.52℃ and salinity of 33.1. Combining the spatial distribution of 210Pb and hydrographical characteristics in the western Arctic Ocean, this scenario was ascribed to the effective scavenging of 210Pb when the Pacific water flowed across the Chukchi Shelf. Quantitatively, this interpretation was supported by both the shorter residence times and higher scavenging efficiencies (SE) of dissolved 210Pb over the Chukchi Shelf. The highest SE values were observed in the Herald Shoal and bottom waters over the slope. |
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