| LAS测定显热通量的影响因子分析 |
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| 引用本文： | 黄妙芬,刘绍民,朱启疆.LAS测定显热通量的影响因子分析[J].干旱区资源与环境,2004,18(4):133-138. |
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| 作者姓名： | 黄妙芬 刘绍民 朱启疆 |
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| 作者单位： | 北京师范大学地理学与遥感科学学院遥感与地理信息系统研究中心,遥感科学国家重点实验室,环境遥感与数字城市北京市重点实验室,北京,100875 |
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| 基金项目： | 国家重点基础研究发展规划项目“地球表面时空多变要素的定量遥感理论及应用”(课题编号 :G2 0 0 0 0 7790 8)，国家自然科学基金资助项目 (批准号 :40 2 710 81) |
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| 摘 要： | 利用 2 0 0 2年 3月 2 6日～ 7月 30日期间北京市昌平区小汤山镇裸地上大孔径闪烁仪 ( LAS)、涡度相关技术 ( Eddy)、波文比 ( Bowen)测定的显热通量及其它相关的观测资料 ,分析了 LAS测定的显热通量在不同的天气条件下的变化特征 ,并将 LAS测定的显热通量与各深度的土壤水分含量、土壤表面温度和水平风速作了相关性分析 ,通过对这些影响因子进行分析将有助于提高 LAS测定显热通量的精度。同时将 L AS测定的显热通量与涡度相关和波文比的观测值进行了对比分析 ,探讨了在均匀下垫面上 LAS测定的显热通量区域平均值与涡度相关和波文比测定的单点值之间的关系 ,有助于进一步研究均匀下垫面上显热通量的尺度转换效应
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| 关 键 词： | LAS 显热通量 影响因子 分析 |
| 文章编号： | 1003-7578(2004)04-133-06 |
| 修稿时间： | 2003年11月19 |
Analysis of the Factors Impacting Surface Sensible Heat Fluxes with Large Aperture Scintillometers |
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| HUANG Miao-fen,LIU Shao-mim,ZHU Qi-jiang.Analysis of the Factors Impacting Surface Sensible Heat Fluxes with Large Aperture Scintillometers[J].Journal of Arid Land Resources and Environment,2004,18(4):133-138. |
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| Authors: | HUANG Miao-fen LIU Shao-mim ZHU Qi-jiang |
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| Abstract: | Large Aperture Scintillometers (LAS), Bowen ratio and eddy covariance measurements and other observed data were employed to study sensible heat flux over homogeneous bare soil surface from March 20th to April 20th, 2002, at XiaoTangshan area, Beijing. The diurnal variation of sensible heat flux from LAS is analyzed in this paper, and the relation between sensible heat flux and weather conditions is discussed. Moreover, the related coefficient between LAS based surface sensible heat fluxes and the influencing factors such as soil weight moisture content in various depths, soil surface temperature and wind speed were analyzed. The analysis could help us to improve the accurate of LAS based surface sensible heat flux. Further, the comparisons of the scintillometer flux measurements with the measurements of Bowen ratio and eddy correlation methods were done in order to make more research on scaling-up of surface sensible heat flux from point to region.This investigation showed that LAS measurements were ideal for long-term monitoring over spatial scales relevant to atmospheric models and remote sensing observations. The conclusion was to be obtained that (1) diurnal variation characteristic of sensible heat flux was similar to that of air temperature under different weather conditions, having a peak value. Generally the peak values were different for different weather conditions. The sensible heat flux in fine day was about twice than that in cloud shadow; (2) the relation between soil weight moisture content and LAS based surface sensible heat flux was negative, soil weight moisture content in 10cm had the largest impact on LAS based surface sensible heat flux and the correlation coefficients were over -0.87; (3) the relation between soil surface temperature and LAS based surface sensible heat flux was positive, and the correlation coefficients were over 0.9;(4) the impact of wind speed on LAS based surface sensible heat flux was small and the correlation coefficients were below 0.5; (5) The sensible heat flux obtained using the eddy correlation, Bowen ratio and scintillometer methods showed good agreement, and the correlation coefficients were normally over 0.8. |
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| Keywords: | Large aperture scintillometers surface sensible heat fluxes influencing factors analysis |
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