Air-sea CO<sub>2</sub> flux and its related parameters over BR Section of the Bering Sea

GAO Zhong-yong; SUN Heng; CHEN Li-qi

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GAO Zhong-yong, SUN Heng, CHEN Li-qi. Air-sea CO2 flux and its related parameters over BR Section of the Bering Sea[J]. Haiyang Xuebao, 2011, 33(6): 85-92.

Citation:

GAO Zhong-yong, SUN Heng, CHEN Li-qi. Air-sea CO₂ flux and its related parameters over BR Section of the Bering Sea[J]. Haiyang Xuebao, 2011, 33(6): 85-92.

GAO Zhong-yong, SUN Heng, CHEN Li-qi. Air-sea CO2 flux and its related parameters over BR Section of the Bering Sea[J]. Haiyang Xuebao, 2011, 33(6): 85-92.

Citation:

GAO Zhong-yong, SUN Heng, CHEN Li-qi. Air-sea CO₂ flux and its related parameters over BR Section of the Bering Sea[J]. Haiyang Xuebao, 2011, 33(6): 85-92.

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Air-sea CO₂ flux and its related parameters over BR Section of the Bering Sea

Key Laboratory of Global Change and Marine-atmospheric Chemistry, State Oceanic Administration, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2010-10-08
Rev Recd Date: 2011-07-20

Abstract

Abstract

Underway measurements of surface seawater and atmospheric partial pressure of CO₂(pCO₂)along BR Section in the Bering Sea were conducted during the 3^rd Chinese national arctic research expedition (CHINARE-2008) in July 2008. CO₂ system parameters were detected from discrete water column sampling stations as well. The latitudinal distributions of pCO₂in the Bering Sea and its relationships with physical and chemical parameters were discussed. According to the CO₂ uptake capacity, the Bering Sea was divided into 4 regions, Bering shelf region (BS), Bering slope current region (BSC), northern Bering Basin Region (NBB) and southern Bering basin region (SBB). The air-sea CO₂ fluxes of the BSC is up to -18.72 mmol/(m²·d), which is two times as much as that of northern basin and one order of magnitude higher than that of southern basin. pCO₂ in the northern basin and slope increases with temperature, showing a positive correlation. However, the relationship between pCO₂ in the slope and southern basin and temperature was indistinct, suggesting that temperature was not the dominant controlling factor there.pCO₂ in the northern basin and shelf exhibited a positive correlation with salinity, indicating that pCO₂ was mainly affected by mixing of water masses, whereas indistinct relationship existed in the southern basin and slope. The main reason of higher pCO₂ in the southern basin is well-mixed water masses with higher temperature; more saline, higher total dissolved inorganic carbon (DIC) and total alkalinity(TA).On the contrary, the water masses in the slope were significantly different from those of other regions in the Bering Sea, with obvious lower temperature, fresher, lower DIC and TA, leading to lower pCO₂ in the surface seawater.
- Bering Sea,
- Bering slope current,
- air-sea CO₂ flux,
- dissolved inorganic carbon,
- total alkalinity

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