Variability of the gas transfer velocity of CO2 in a macrotidal estuary (the Scheldt)
Variability of the gas transfer velocity of CO2 in a macrotidal estuary (the Scheldt)
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DOI：
10.1007/bf02907647
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发表时间：
2004-08-01
期刊：
影响因子：
--
通讯作者：
Frankignoulle, M
中科院分区：
文献类型：
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作者：
Borges, AV;Vanderborght, JP;Frankignoulle, M
我们报告了一个大的295界面的二氧化碳（CO2）通量测量在斯海尔德河口在2002年11月和2003年4月，使用浮动室的方法。从伴随测量的空气-水CO2梯度，我们计算的气体传输速度的CO2。气体传输速度与风速有很好的相关性，并且简单的线性回归函数给出了与数据最一致的拟合。基于水流测量，我们利用奥康纳和多宾斯（1958）的概念关系估算了水流引起的湍流对气体传输速度的贡献。这使我们能够构建一个经验关系来计算CO2的气体传输速度，该速度考虑了风和服务器电流的贡献。在此基础上，研究了斯海尔德河口气体输移速度的时空变化规律。水流对气体输送速度的贡献很大，但空间和时间的变化（从日常到季节尺度）主要与风速变化有关。
We report a large set of 295 interfacial carbon dioxide (CO2) flux measurements obtained in the Scheldt estuary in November 2002 and April 2003, using the floating chamber method. From concomitant measurements of the air-water CO2 gradient, we computed the gas transfer velocity of CO2. The gas transfer velocity is well correlated to wind speed and a simple linear regression function gives the most consistent fit to the data. Based on water current measurements, we estimated the contribution of water current induced turbulence to the gas transfer velocity, using the conceptual relationship of O'Connor and Dobbins (1958). This allowed us to construct an empirical relationship to compute the gas transfer velocity of CO2 that accounts for the contribution of wind and waiter current. Based on this relationship, the spatial and temporal variability of the gas transfer velocity in the Scheldt estuary was investigated. Water currents contribute significantly to the gas transfer velocity, but the spatial and temporal variability (from daily to seasonal scales) is mainly related to wind speed variability.