Low <sup>210</sup>Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea

HU Wangjiang; CHEN Min; YANG Weifeng; ZHANG Run; QIU Yusheng; ZHENG Minfang

doi:10.1007/s13131-014-0486-6

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Article Navigation > Acta Oceanologica Sinica > 2014 > 33(6): 28-39

HU Wangjiang, CHEN Min, YANG Weifeng, ZHANG Run, QIU Yusheng, ZHENG Minfang. Low 210Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea[J]. Acta Oceanologica Sinica, 2014, 33(6): 28-39. doi: 10.1007/s13131-014-0486-6

Citation:

HU Wangjiang, CHEN Min, YANG Weifeng, ZHANG Run, QIU Yusheng, ZHENG Minfang. Low ²¹⁰Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea[J]. Acta Oceanologica Sinica, 2014, 33(6): 28-39. doi: 10.1007/s13131-014-0486-6

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Low ²¹⁰Pb in the upper thermocline in the Canadian Basin: scavenge process over the Chukchi Sea

doi: 10.1007/s13131-014-0486-6

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

Received Date: 2013-01-25
Rev Recd Date: 2013-04-13

Abstract

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.
- ²¹⁰Pb,
- halocline,
- Canadian Basin,
- Chukchi Sea

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