摘要
基于为期1 a(2001-2002年)的“西北干旱区陆-气相互作用试验”(DHEX)大型野外观测数据,对干旱区地表能量,即净辐射通量、感热通量、潜热通量和土壤热通量进行分析,得到一些有关地表能量的新认识。提出并且讨论了计算地表能量通量的方法及其优缺点。
The climate in northwest China is characterized by infrequent occurrence of precipitation and violent evaporation. In this paper, the land surface energy parameters including the net radiation flux （Rn）, sensible heat fluxes （H）, latent heat fluxes （λE） and soil heat fluxes （G0） are analyzed using the meteorological data observed by Dunhuang Micro-meteorological Iron-tower Station for the Dunhuang Experiment during the period from September 2001 to August 2002. Dunhuang Micro-meteorological Iron-tower Station （40°10＇N, 94°31＇E, 1 139 m a. s. 1. ） is located in the Dunhuang region, Gansu Province, where the average annual precipitation and air pressure are 32 mm and 873 hPa respectively. The observed meteorological gradient data at the tower station included the wind speed, wind direction, air temperature and humidity as well as the radiation, soil moisture content, soil heat flux, etc. The gradient data of wind speed, air temperature and humidity were observed at heights of 18 m, 8 m, 4 m and 2 m of the tower （the observation heights of 4 m and 2 m were moved down to 2 m and 1 m after June 5, 2000）, and the wind direction was observed at height of 10 mi the components of radiation balance included the total radiation, upward long wave radiation, downward long wave radiation and upward short wave radiation. After analyzing, some new results about land surface energy in arid regions in northwest China are derived, and rome methods of calculating surface heat fluxes and their advantages and disadvantages are discussed.
出处
《干旱区研究》
CSCD
北大核心
2006年第1期76-82,共7页
Arid Zone Research
基金
干旱气象科学研究基金项目(IAM200504)
西北干旱区非均匀地表植被参数和能量通量的卫星遥感参数化和中国科学院知识创新工程方向性项目(KZCX3-SW-329和KZCX3-SW-339)共同资助
关键词
地表能量
通量
地面观测
干旱区
敦煌
land surface energyl heat fluxi field observation
arid region Dunhuang.
