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Estimating Sensible and Latent Heat Fluxes over an Inland Water Body Using Optical and Microwave Scintillometers
Boundary-Layer Meteorology ( IF 4.3 ) Pub Date : 2022-09-15 , DOI: 10.1007/s10546-022-00732-7
Adrien Pierre, Pierre-Erik Isabelle, Daniel F. Nadeau, Antoine Thiboult, Alexei Perelet, Alain N. Rousseau, François Anctil, Jaril Deschamps

Observations of turbulent heat fluxes over inland water bodies are scarce despite being critical to adequate lake parametrization for numerical weather forecast and climate models. Scintillometry has allowed for the regional (~ km2) estimation of turbulent heat fluxes, but few studies have assessed its performance over water. We compare scintillometry-derived turbulent heat fluxes over an 85-km2 dimictic boreal hydropower reservoir in eastern Canada (50.69° N, 63.24° W) with data from a raft-based eddy-covariance system. To the best of our knowledge, this is one of the first studies to quantify evaporation over an inland water body using a set of optical and microwave scintillometers. The scintillometer beam path extended 1.7 km over a section of the reservoir with depths of up to 100 m, from 14 August to 9 October 2019. Forty-nine days of data were retained. This study quantifies the impact of atmospheric stability on the derived fluxes and explores the use of temperature differences at the water–air interface from a point close to the centre of the scintillometer beam to properly estimate the direction of the sensible heat flux. The scintillometry approaches were well correlated with the eddy-covariance estimations for sensible heat fluxes (R2 up to 0.86, 32% bias), while the agreement decreased for latent heat fluxes (R2 up to 0.59, 69% bias). The scintillometer measured much larger latent heat fluxes than the eddy-covariance set-up. These results may be due to the larger footprint of the scintillometers capturing greater heterogeneity in the fluxes.



中文翻译:

使用光学和微波闪烁仪估计内陆水体上的显热和潜热通量

尽管对于数值天气预报和气候模型的足够湖泊参数化至关重要,但对内陆水体上的湍流热通量的观测却很少。闪烁法已允许对湍流热通量进行区域(~ km 2)估计,但很少有研究评估其在水上的性能。我们比较了 85-km 2范围内闪烁法得出的湍流热通量加拿大东部(北纬 50.69 度,西经 63.24 度)的二元北方水电水库,数据来自基于筏板的涡度协方差系统。据我们所知,这是使用一组光学和微波闪烁仪量化内陆水体蒸发量的首批研究之一。从 2019 年 8 月 14 日至 10 月 9 日,闪烁仪光束路径在深度达 100 m 的水库部分延伸了 1.7 km。保留了 49 天的数据。本研究量化了大气稳定性对导出通量的影响,并探讨了使用靠近闪烁计光束中心点的水-空气界面处的温差来正确估计显热通量的方向。R 2高达 0.86,32% 偏差),而潜热通量的一致性降低(R 2高达 0.59,69% 偏差)。闪烁仪测量的潜热通量比涡协方差装置大得多。这些结果可能是由于闪烁计的更大足迹捕获了通量中更大的异质性。

更新日期:2022-09-16
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