RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2016, Vol. 25 >> Issue (05): 733-742.doi: 10.11870/cjlyzyyhj201605006

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TEMPROAL VARIABILITY OF RADIATION AND ENERGY BUDGETS OVER LAKE TAIHU

HUANG Rui1, ZHAO Jia-yu1, XIAO Wei1,2, LIU Shou-dong1,2, LI Han-chao1, XU Jing-zheng1, HU Cheng1, XIAO Qi-tao1   

  1. 1. Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing 210044, China;
    2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • Received:2015-11-17 Revised:2016-03-02 Online:2016-05-20
  • Supported by:
    National Natural Science Foundation of China (41475141, 41505005 and41575147);Program for Changjiang Scholars and Innovative Research Team in University;Priority Academic Program Development of Jiangsu Higher Education Institutions

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Abstract: Observation on radiation and energy budget over lakes are important for meteorological and hydrological studies. Based on the eddy covariance and micrometeorological system, the radiation budget over lake surface, sensible and latent heat flux between lake and atmospheric interface, water temperature and meteorological variables were observed in 2012. Temporal variability of radiation and energy budgets and the environmental controlling factors were analyzed. The results indicated that:(1) Annual mean of the four components of radiation balance in Lake Taihu in 2012 (i.e., downward and upward shortwave radiation, downward and upward longwave radiation) were 146.5 W m-2, 9.4 W m-2, 359.7 W m-2 and 405.4 W m-2, respectively. Annual mean albedo was 0.06. There were obvious diurnal and seasonal variations for each radiation budget. (2)The diurnal pattern of water heat storage was similar to that of net radiation with maximum and minimum values at noon and midnight, respectively. With comparison to net radiation and water heat storage, the diurnal variation amplitude of turbulent energy flux was smaller. The energy distribution is different between sunny and cloudy days:latent heat flux dominates an sunny days, while water heat storage dominate on cloudy days. (3) Correlation analysis between turbulence energy flux and environmental variables indicated that sensible heat flux was mainly controlled by the product of the wind speed and temperature difference at the interface between lake and air; and the product of wind speed and water vapor pressure at their interface was the main driving factor for latent heat flux. This study can provide scientific reference to understanding the mechanism of lake-atmospheric interaction and to identify the contribution of lake in global energy budgets.

Key words: Lake Taihu, Eddy Covariance, Radiation budgets, Sensible Heat Flux, Latent Heat Flux

CLC Number: 

  • P461.5
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