[1]程洁,孙林,朱寿东,等.宽波段发射率对长波净辐射估算影响分析?[J].山东建筑大学学报,2012,(04):355-359.
 CHENG Jie,SUN Lin,ZHU Shou-dong,et al.Influence of the optimal broadband emissivity spectral range on calculating surface longwave net radiation[J].Journal of Shandong jianzhu university,2012,(04):355-359.
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宽波段发射率对长波净辐射估算影响分析?()
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《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
期数:
2012年04期
页码:
355-359
栏目:
研究论文
出版日期:
2012-08-15

文章信息/Info

Title:
Influence of the optimal broadband emissivity spectral range on calculating surface longwave net radiation
作者:
程洁1孙林2朱寿东3王春香2
1北京师范大学 全球变化与地球系统科学研究院,北京 100875; 2山东科技大学 测绘科学与工程学院,山东 青岛 266590; 3北京师范大学 地理学与遥感科学学院,北京 100875
Author(s):
CHENG Jie1 SUN Lin2 ZHU Shou-dong3 et al.
1. College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China; 2. Geomatics College of Shandong University of Science and Technology, Qindao 266590, China; 3. School of Geography, Beijing Normal University, Beijing 100875, China
关键词:
地图学与地理信息系统宽波段发射率复折射指数地表辐射能量平衡陆面模式
Keywords:
cargography & geographic information system broadband emissivity refractive index surface radiation budget land surface model
文献标志码:
A
摘要:
地表宽波段发射率是估算地表长波净辐射的关键参数。陆面模式计算的是4~100 ?m的地表长波净辐射,而遥感仅能提供3~14 ?m范围内的宽波段发射率。评价遥感宽波段发射率用于地表长波净辐射计算的精度,需要光谱范围更宽的地表发射率光谱。借助辐射传输模型模拟的水体、冰/雪和矿物1~200 ?m发射率光谱,调查了不同光谱范围的宽波段发射率和全波长宽波段发射率的差异。结果表明4~100 ?m宽波段发射率与全波长宽波段发射率最接近。调查了不同光谱范围内遥感宽波段发射率在计算4~100 ?m长波净辐射的精度,发现8~13.5 ?m的宽波段发射率具有最高的精度,偏差小于0.01 W/m2,均方根误差小于1 W/m2。并给出由ASTER和MODIS窄波段发射率产品计算8~13.5 ?m宽波段发射率的转换公式。
Abstract:
Surface broadband emissivity (BBE) in thermal infrared is an important parameter for estimating the net surface longwave radiation. The BBE at 4–100 ?m is needed in land surface models. However, the BBE estimated from remote sensing narrowband emissivity product is limited to 3–14 ?m. More realistic emissivity spectra are essential to evaluate BBE at which spectral domain could be used to calculate net surface longwave radiation in land surface models. By virtue of modern radiative transfer tools, the emissivity spectra of water, snow and minerals in approximately 1–200 ?m were derived. With these emissivity spectra, we investigated the difference of BBE at all wavelength and those at different spectral domains and found that BBE at 4–100 ?m can replace BBE at all wavelength. We also examined the accuracy of BBE that could be calculated from remotely sensed narrowband emissivity products in estimating the net surface longwave radiation. The BBE at 8–13.5 ?m could be used to calculate the net surface longwave radiation in land surface models with a bias of 0.01 W/m2 and a RMS less than 1 W/m2. Using more representative emissivity spectra, we derived the conversion coefficients of the linear functions that can be used to calculate BBE at 8–13.5 ?m from ASTER and MODIS narrowband emissivity products.
更新日期/Last Update: 2012-10-05