| 张杰,杨兴国,李巧珍.应用EOS-MODIS卫星资料推算西北雨养农业区能量通量[J].干旱地区农业研究,2005,(5):226~231 |
| 应用EOS-MODIS卫星资料推算西北雨养农业区能量通量 |
| Estimation of energy fluxes in dry-farming region in northwest China by EOS-MODIS data |
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| DOI：10.7606/j.issn.1000-7601.2005.05.45 |
| 中文关键词: 能量通量 EOS-MODIS卫星资料 雨养农区 |
| 英文关键词:energy flux EOS-MODIS data northwest China dry-farming region |
| 基金项目:国家自然基金“半干旱雨养农业区地气相互作用观测试验研究(40205005)”项目 |
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| 中文摘要: |
| 应用定西地区的气象资料和4次EOS-MODIS卫星资料,对典型的西北半干旱雨养农业区的基本地表特征参数进行反演,并在此基础上对各能量通量进行估算,进而分析了各通量的季节变化。结果表明,应用卫星数据估算的通量与净辐射之比与实际观测值基本接近,绝对误差在10%以内,其空间分布基本反映了当地的实际情况;土壤热通量、显热通量以及潜热通量的季节变化基本表现为冬季最小,其次是秋季,夏春两季最大;通量四季变化也呈现出不均匀的分布特性,频率分布范围较宽,体现了该区域的地形、地貌以及下垫面复杂的特征。 |
| 英文摘要: |
| By using the meteorological data and EOS-MODIS data of Dingxi region, some basic ground surface parameters in the dry-farming region in northwest China are derived, and each energy flux is estimated. Moreover, the seasonal variation of the parameters is analyzed. The results show that the percentage of each flux value in net radiation energy estimated by MODIS is close to the observed value, the absolute error being less than 10%, which means that the derived fluxes may reflect the fact of the region. The seasonal variation of soil heat flux, palpable heat flux and latent heat flux appears to be the smallest in winter, and the largest in summer and spring. The seasonal variation of these fluxes also appears to be very asymmetrical in distribution, which embodies the complex surface characters of landform and physiognomy in the region. |
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