Air‐sea gas transfer in high Arctic fjords
Air‐sea gas transfer in high Arctic fjords
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北极高峡湾的海气输送
DOI：
10.1002/2016gl072373
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发表时间：
2017
影响因子：
5.2
通讯作者：
A. Rutgersson
中科院分区：
文献类型：
--
作者：
Andreas Andersson;Eva Falck;Anna Sjöblom;Natascha Kljun;E. Sahlée;Abdirahaman Omar;A. Rutgersson
在北极峡湾和高纬度海域，在一年的大部分时间里，强烈的表面冷却占主导地位，产生水侧对流（w* w）和增强的水中湍流。这些地区是全球碳循环的关键区域；因此，正确描述它们的海气交换是至关重要的。通过涡旋相关技术测量了海洋北极条件下的CO2数据，揭示了水侧对流对气体传输速度的主要影响。即使在风速高达9 m s - 1的情况下也能观察到这一点，在这种情况下，对流运动通常被风驱动的湍流所抑制。水侧对流引起的大气-海洋对CO2的转移增加了近一倍的CO2吸收量；在按比例调整到公海条件后，w* w对CO2通量的贡献仍然高达34%。预计这一现象对北极海洋地区的碳吸收总量非常重要。
In Arctic fjords and high‐latitude seas, strong surface cooling dominates during a large part of the year, generating water‐side convection (w* w) and enhanced turbulence in the water. These regions are key areas for the global carbon cycle; thus, a correct description of their air‐sea gas exchange is crucial. CO2 data were measured via the eddy covariance technique in marine Arctic conditions and reveal that water‐side convection has a major impact on the gas transfer velocity. This is observed even at wind speeds as high as 9 m s−1, where convective motions are generally thought to be suppressed by wind‐driven turbulence. The enhanced air‐sea transfer of CO2 caused by water‐side convection nearly doubled the CO2 uptake; after scaled to open‐sea conditions the contribution from w* w to the CO2 flux remained as high as 34%. This phenomenon is expected to be highly important for the total carbon uptake in marine Arctic areas.