The variation characteristics of the energy flux and meteorological elements of the underlying surface of the forest during the wet and dry seasons were compared and analyzed by using observation data obtained from November 2014 to May 2016 from the Zhuhai Phoenix Mountain Land-Atmosphere Interaction Observation Tower Station. The variation characteristics of the momentum and sensible heat exchange coefficients in three wind direction ranges (315°-45°, 45°-135°, and 135°-225°) along with the canopy-surface wind speed under different stability conditions, as well as the parameterizations of these coefficients were analyzed. The sensible heat and latent heat fluxes in the dry season were equivalent, whereas in the wet season latent heat is much higher than the sensible heat. Negative sensible heat occurs during the night in both the dry and wet seasons, with the sensible heat being transported from the atmosphere to the forest. The variation range of the relative humidity is large and is closely related to the meteorological conditions in the area. The vertical gradient of the relative humidity is larger at night and smaller during the day. The vertical gradient of the air temperature in the dry season is more significant than that in the wet season. The wind speed changes gently in winter but violently in summer. There is an obvious gradient in the low-level wind speed with height, whereas the high-level wind is chaotic. The wind direction at different heights does not differ significantly. In neutral and near-neutral states, the momentum exchange coefficients Cdn are 0.05, 0.0055, and 0.022, respectively, when the wind directions are 315°-45°, 45°-135°, and 135°-225°, and the sensible heat exchange coefficients Chn are 0.0055, 0.003, and 0.004, respectively. Under stable and unstable conditions, the momentum exchange coefficient Cd and the sensible heat exchange coefficient Ch obviously change with the wind velocity v on the canopy surface. Under stable conditions, Cd and Ch increase with increases in v, and under unstable conditions, Cd, and Ch decrease with increases in v. We fitted the relationships between Cd, Ch in the forest canopy and v under stable and unstable conditions in different wind directions, and obtained the parameterized formula.
刘雨佳,韦志刚,陈辰,董文杰,朱献,陈广宇,刘雅静.2020.珠海凤凰山森林下垫面干季和湿季气象要素的对比分析与动量和感热交换系数的参数化研究[J].气候与环境研究,25(5):457-468. LIU Yujia, WEI Zhigang, CHEN Chen, DONG Wenjie, ZHU Xian, CHEN Guangyu, LIU Yajing.2020. Comparison of Meteorological Elements in Dry and Wet Seasons and Parameterization of Momentum and Sensible Heat Exchange Coefficients near the Underlying Surface of the Zhuhai Phoenix Mountain Forest[J]. Climatic and Environmental Research (in Chinese],25(5):457-468.Copy