Air–water gas exchange in lakes and reservoirs measured from a moving platform by underwater eddy covariance
Air–water gas exchange in lakes and reservoirs measured from a moving platform by underwater eddy covariance
复制标题
通过水下涡流协方差从移动平台测量湖泊和水库中的空气-水气体交换
DOI：
10.1002/lom3.10373
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Buelo, Cal D.
中科院分区：
文献类型：
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作者：
Berg, Peter;Pace, Michael L.;Buelo, Cal D.
O2、CO2和CH 4等气体的气水交换率广泛用于湖泊和水库的生态系统研究，但其大小往往难以评估。在这项概念验证研究中，我们通过水下涡动协方差在移动平台上测量了这种透镜系统中的气体交换。我们使用声学多普勒测速仪和安装在船头的快速响应O2温度传感器来测量水的速度，O2浓度和空气-水界面以下（约10 cm）的温度，同时船由电动拖缆马达以恒定速度（约25 cm s−1）推进。每行驶3分钟（~ 45 m），计算气水界面上的O2和热量通量以及标准气体交换系数k600。所有部署都是在平静的低风条件下进行的，其中经验关系fork 600最不确定。k600的平均部署范围从0.070到0.39 m d− 1，与热通量和水温都有很强的相关性。在一次部署中，沿着水库1 km长的断面测量到平均水柱O2浓度的变化> 20%。考虑到驱动气体交换的空气-水界面上O2浓度差异的典型大小，即使在接近恒定的交换系数下，如果基于固定的单点O2测量，这种横向变化也会导致高度偏差的整个生态系统通量。“移动的”水生涡度协方差测量能够在真实的原位条件下以高的时间和空间分辨率量化湖泊和水库中的气体交换。
Air–water exchange rates of gasses, such as O2, CO2, and CH4, are widely used in ecosystem studies of lakes and reservoirs, but their magnitudes are often difficult to assess. In this proof‐of‐concept study, we measured gas exchange by underwater eddy covariance in such lentic systems from a moving platform. We used an Acoustic Doppler Velocimeter and a fast‐responding O2‐temperature sensor mounted in the bow of a boat to measure water velocity, O2concentration, and temperature below the air–water interface (~ 10 cm) while the boat was propelled at constant speed (~ 25 cm s−1) by an electric trolling motor. Fluxes of O2and heat across the air–water interface and standard gas exchange coefficients,k600, were calculated for every 3 min of traveled distance (~ 45 m). All deployments were done under calm low‐wind conditions where empirical relationships fork600are most uncertain. Deployment averages ofk600ranged from 0.070 to 0.39 m d−1and were strongly correlated with both the heat flux and the water temperature. In one deployment, a > 20% variation in mean water column O2concentration was measured along a 1 km long transect of a reservoir. Given the typical size of O2concentration differences over the air–water interface that drive gas exchange, such lateral variations can, even at a near‐constant exchange coefficient, result in highly biased whole‐ecosystem fluxes if based on stationary single‐point O2measurements. “Mobile” aquatic eddy covariance measurements enable quantification of gas exchange in lakes and reservoirs under true in situ conditions and with high temporal and spatial resolution.
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影响因子：
--
作者：
C. Reimers;H. Özkan‐Haller;P. Berg;A. Devol;Kristina McCann-Grosvenor;Rhea D. Sanders
通讯作者：
C. Reimers;H. Özkan‐Haller;P. Berg;A. Devol;Kristina McCann-Grosvenor;Rhea D. Sanders
影响因子：
4.5
作者：
Matthew C. Van de Bogert;D. Bade;S. Carpenter;J. Cole;M. Pace;P. Hanson;O. Langman
通讯作者：
Matthew C. Van de Bogert;D. Bade;S. Carpenter;J. Cole;M. Pace;P. Hanson;O. Langman
影响因子：
4.9
作者：
Berg, Peter;Pace, Michael L.
通讯作者：
Pace, Michael L.
多功能光极系统，用于测量海水中的氧气、二氧化碳和 pH 值，配有集成电池和记录仪
DOI：
--
发表时间：
2018
期刊：
Limnology and Oceanography: Methods
影响因子：
--
作者：
Christoph Staudinger;M. Strobl;Jan P. Fischer;R. Thar;T. Mayr;D. Aigner;Bernhard J. Müller;Bernhard J. Müller;Philipp Lehner;G. Mistlberger;Eva Fritzsche;Josef Ehgartner;P. Zach;J. Clarke;Felix Geissler;André Mutzberg;J. Müller;E. Achterberg;S. Borisov;I. Klimant
通讯作者：
I. Klimant
沿海生态系统中的氧代谢和 pH 值：涡流协方差氢离子和氧交换系统 (ECHOES)
DOI：
10.1002/lom3.10038
发表时间：
2015
期刊：
Limnology and Oceanography: Methods
影响因子：
--
作者：
M. Long;M. Charette;W. Martin;D. McCorkle
通讯作者：
D. McCorkle