Surface Energy Flux Changes and Budget in a Typical Coastal Reed Wetland (Liaohe Delta, China)

摘要

Coastal wetlands are located between the continents and oceans, and their surface energy flux changes and budget play an important role in regulating regional climate. Liaohe Delta is a typical coastal reed wetland in China. The latent heat, sensible heat, and net radiation flux of reed wetlands in Liaohe Delta were studied for four consecutive years (20122015) on the basis of the eddy correlation system. The average annual accumulation of latent heat flux was 1525.39 MJ m(-2), with a large seasonal variation. The latent heat flux was positive, and the peak value did not exceed 320 W m(-2) in the daytime. The latent heat flux increased with the increase of temperature each day. The annual average sensible heat flux was 550.96 MJ m(-2), with the minimum sensible heat in June and July, and the daily average change peak did not exceed 160 W m(-2). The annual net radiation accumulation was 2868.32 MJ m(-2), and the net radiation in winter decreased. The maximum value of net radiation in summer reached 622 W m(-2). Latent heat flux accounted for 41%-63% of solar radiation, followed by storage flux, and sensible heat flux had the lowest value. This typical reed wetland has a strong water vapor regulation ability. These results contribute to research on land surface processes in wetlands.