Spatial and temporal variations of freshwater components at a transect near the Bering Strait during 2003-2012

Pan Hong; Chen Min; Tong Jinlu; Qiu Yusheng; Zheng Minfang

doi:10.3969/j.issn.0253-4193.2015.11.013

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Pan Hong, Chen Min, Tong Jinlu, Qiu Yusheng, Zheng Minfang. Spatial and temporal variations of freshwater components at a transect near the Bering Strait during 2003-2012[J]. Haiyang Xuebao, 2015, 37(11): 135-146. doi: 10.3969/j.issn.0253-4193.2015.11.013

Citation:

Pan Hong, Chen Min, Tong Jinlu, Qiu Yusheng, Zheng Minfang. Spatial and temporal variations of freshwater components at a transect near the Bering Strait during 2003-2012[J]. Haiyang Xuebao, 2015, 37(11): 135-146. doi: 10.3969/j.issn.0253-4193.2015.11.013

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Spatial and temporal variations of freshwater components at a transect near the Bering Strait during 2003-2012

doi: 10.3969/j.issn.0253-4193.2015.11.013

1.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2.
College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;State Key Laboratory of Marine Environmental Science, Xiamen 361102, China

Received Date: 2015-05-01

Abstract

Abstract

Seawater δ¹⁸O at a transect along 64.3°N near Bering strait from 2003 to 2012 was determined, and the fractions of sea-ice melted water (SIM) and river water (RW) were calculated using mass balance of salinity and δ¹⁸O. The spatial distribution and interannual variability of freshwater components in the Bering Strait were discussed. Our results showed that the signals of depleted δ¹⁸O, low salinity, warmer temperatures and higher river runoff fractions were found in the region affected by the Alaska Coastal Water (ACW) on the eastern part of the section, while high δ¹⁸O, high salinity, and lower sea-ice melted water fractions were observed in the western part with the influence of Anadyr water. The moderate properties were revealed in the middle part of the section with the influence of the Bering Shelf Water. The fractions of river runoff in the region affected by the Alaska Coastal Water were approximately twice as much as in regions affected by the Bering Shelf Water and the Anadyr Water. The interannual variation of river runoff fractions in regions affected by the Alaska Coastal Water showed a characteristic of 2010 > 2012 > 2003 > 2008, which was regulated by the interannual variation of the Yukon River discharge. The fractions of sea-ice melted water were similar in the regions affected by the Bering Shelf Water and the Alaska Coastal Water, and higher (~45%) than those in the region affected by the Anadyr Water. The interannual variation of sea-ice melted water fractions showed a characteristic of 2003>2008≈2012 > 2010, controlled by the interannual variation of sea ice cover in the Bering Sea. The freshwater pass through the Bering Strait was constitute of 46% river water and 54% sea-ice melted water in average. The fraction ratios of river water to sea-ice melted water in the regions affected by the Alaskan Coastal Water, the Bering Shelf Water, and the Anadyr Water increased during 2003 to 2012, indicating that the freshwater components in the Pacific inflow also play a role in sea ice melting in the Arctic Ocean.
- Bering Strait,
- fresh water,
- sea-ice melted water,
- river water,
- temporal variation,
- ¹⁸O

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