摘要
近地面能量不闭合问题一直以来都是陆面过程研究的一个重要的科学问题,且在非均匀湿地下垫面的近地面尤为突出。利用中国科学院若尔盖高原湿地生态系统研究站花湖观测场的地面风场和温度场数据,计算了由湿地下垫面热力非均匀性引起的水平热平流,并分析了考虑水平热平流后地表能量平衡的变化。结果表明:2017年夏季若尔盖湿地近地面水平热平流的白天均值为22.9 W·m^(-2),最大值可达58.7 W·m^(-2)。将水平热平流和热储存项引入地表能量平衡方程后,夏季能量闭合度由41.8%提升至67.9%,其中水平热平流的贡献为5.8%,土壤热储存的贡献为20.1%,空气与植物光合作用热储存的贡献为1.0%。若尔盖湿地近地面水平热平流日变化量级与感热通量相当,日变化最大值约为湿地土壤热储存的1/3,对湿地地表能量平衡的影响不容忽视。
The near-surface energy budget closure has always been a scientific hot topic in the land-surface processes research,especially over the underlying surface of heterogeneous wetlands.In this investigation,the horizontal thermal advection caused by thermal inhomogeneity of the underlying surface over the wetland is calculated based on the data of the Flower-lake observation field in the Zoige alpine wetland.With considering the horizontal thermal advection,its contribution to the near-surface energy closure is analyzed.The results show that the mean horizontal thermal advection of the Zoige wetland is 22.9 W·m^(-2),and the maximum value can reach58.7 W·m^(-2) in the daytime of summer 2017.After introducing the horizontal thermal advection and soil heat storage into the near-surface energy balance equation,the near-surface energy closure ratio increased from 41.8% to 67.9% in summer.The contribution of horizontal thermal advection was 5.8%,that of soil thermal storage was 20.1%,and that of plant photosynthetic thermal storage was 1.0%.The diurnal variation of the near-surface horizontal thermal advective is equivalent to the sensible heat flux in Zoige wetland,and the maximum diurnal variation is about one third of the thermal storage of the wetland soil.
作者
陆宣承
文军
杨越
田辉
刘闻慧
武月月
蒋雨芹
LU Xuancheng;WEN Jun;YANG Yue;TIAN Hui;LIU Wenhui;WU Yueyue;JIANG Yuqin(College of Atmospheric Sciences,Chengdu University of Information Technology/Sichuan Key Laboratory of Plateau Atmosphere and Environment,Chengdu 610225,Sichuan,China;Northwest Institute of Ecological Environment and Resources,Chinese Academy of Sciences/Key Laboratory of Land Surface Process and Climate Change in the Cold and Arid Region of the Chinese Academy of Sciences,Lanzhou 730000,Gansu,China)
出处
《高原气象》
CSCD
北大核心
2022年第1期122-131,共10页
Plateau Meteorology
基金
国家自然科学基金项目(41971308,41530529)。
关键词
高寒湿地
涡动相关
水平热平流
地表能量平衡
非均匀下垫面
Alpine wetland
eddy correlation
horizontal thermal advection
energy imbalance
non-uniform underlying surface
