白令海BR断面海-气CO<sub>2</sub>通量及其参数特征

高众勇; 孙恒; 陈立奇

白令海BR断面海-气CO₂通量及其参数特征

国家海洋局第三海洋研究所,福建厦门 361005;海洋-大气化学与全球变化国家海洋局重点实验室,福建厦门 361005

基金项目: 国家自然科学基金项目"白令海入流水对北冰洋生态系统及碳汇的影响研究"(40976116);中央级公益性科研院所基本科研业务费专项资金资助项目"北极碳汇十年变化及其对北极海冰快速变化的响应"(海三科2010011);"夏季白令海二氧化碳体系关键问题研究"(海三科2010001)。

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出版历程
- 收稿日期: 2010-10-08
- 修回日期: 2011-07-20

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

摘要

摘要: 通过对2008年夏季白令海大气和海水pCO₂连续观测资料,结合BR断面上站位水体垂直采样测量,对白令海不同海区pCO₂的分布特征及其与理化参数的关系进行了初步研究,结果表明, 将白令海划分为4个具有不同CO₂吸收能力的海区,其中陆坡流区碳通量高达-18.72 mmol/(m²·d),是海盆北区的近2倍,比海盆南区高一个量级;在海盆北区和陆坡流区pCO₂随温度升高而增加, 两者之间呈正相关关系,而在海盆南区和陆架区两者的关系不明显, 表明这两个海区的温度可能不是pCO₂变化的主要调控因子;在海盆北区与陆架区pCO₂与盐度呈显著的相关,这很可能受到水团混合的影响,而在海盆南区与陆坡流区两者的变化幅度比较小,关系也不显著。在海盆南区有充分混合的高温、高盐、高溶解总无机碳(DIC)和高总碱度(TA)的水体,这是导致该海区CO₂吸收能力最弱的主要原因。在陆坡流区与此相反,呈现出低温、低盐、低TA和低DIC的水体特征,明显不同于白令海盆或白令海陆架区,这可能是形成表层海水pCO₂低值的主要原因。
- 白令海 /
- 白令陆坡流 /
- 海-气CO₂通量 /
- 溶解总无机碳 /
- 总碱度
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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