山东建筑大学学报2012，Vol.27Issue(4)：355-359,5.
宽波段发射率对长波净辐射估算影响分析
Influence of the optimal broadband emissivity spectral range on calculating surface longwave net radiation
摘要
Abstract
Surface broadband emissivity ( BBE) in thermal infrared is an important parameter for estimating the net surface longwave radiation. The BBE at 4 - 100μm is needed in land surface models. However, the BBE estimated from remote sensing narrowband emissivity product is limited to 3 -14μm. 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 -200μm 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 - 100μm 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 μm could be used to calculate the net surface longwave radiation in land surface models with a bias of 0. 01W/m2 and a RMS less than 1W/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. 5u,m from ASTER and MODIS narrowband emissivity products.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Key words
cargography & geographic information system/ broadband emissivity/ refractive index/ surface radiation budget/ land surface model分类
天文与地球科学引用本文复制引用
程洁,孙林,朱寿东,王春香..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,2012,27(4):355-359,5.基金项目
国家自然科学基金项目(40901167) （40901167）
民用航天“十二五”预先研究项目:固体地表要素获取遥感载荷数据处理关键技术研究 （）
