Journal
JOURNAL OF HYDROLOGY
Volume 511, Issue -, Pages 811-824Publisher
ELSEVIER
DOI: 10.1016/j.jhydrol.2014.02.012
Keywords
Eddy covariance; Lake Taihu; Energy balance; Evaporation; Bowen ratio
Funding
- Ministry of Education of China (Grant PCSIRT)
- Priority Academic Program Development of Jiangshu Higher Education Institutions (PARD)
- National Program on Key Basic Research Project of China [2010CB428502]
- National Natural Science Foundation of China [41275024, 31100359]
- Natural Science Foundation of Jiangsu Province [BK2011830]
- Jiangsu Innovation Program for Graduate Education [N0782002075]
- China Scholarship Council
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The surface radiation and energy exchange processes are important drivers of lake evaporation and the associated hydrological cycle. In this paper, we investigated the temporal and spatial variations in evaporation and the associated radiation and energy fluxes across Lake Taihu, China with an eddy covariance mesonet consisting of three lake sites and one land site. The results indicate that on the diurnal scale, water heat storage showed a similar behavior to net radiation with comparable magnitudes and fueled the substantial nighttime evaporation (48% of annual evaporation). Unlike boreal deep lakes, the monthly mean sensible and latent heat flux was tightly coupled with seasonal variations in net radiation at this large (size 2400 km(2)), subtropical (30.9-31.6 degrees N) shallow (mean depth 1.9 m) Lake Taihu. On the monthly to annual scales, the radiation and energy fluxes showed little spatial variations across the lake, indicating a lack of sensitivity to wind speed, water depth, water quality and the presence of submerged macrophytes. The annual mean Bowen ratio (0.12-0.13) of the lake was lower than those found in the literature for subtropical and northern lakes and also much lower than that observed at the adjacent land site (0.58). The experimental data were used to evaluate the performance of 19 lake evaporation models of varying complexities. (c) 2014 Elsevier B.V. All rights reserved.
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