File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
 Publisher Website: 10.1109/LGRS.2012.2206367
 Scopus: eid_2s2.084869499838
 Find via
Supplementary

Citations:
 Scopus: 0
 Appears in Collections:
Article: Estimating the optimal broadband emissivity spectral range for calculating surface longwave net radiation
Title  Estimating the optimal broadband emissivity spectral range for calculating surface longwave net radiation 

Authors  
Keywords  Broadband emissivity (BBE) land surface model refractive index remote sensing surface radiation budget 
Issue Date  2013 
Citation  IEEE Geoscience and Remote Sensing Letters, 2013, v. 10, n. 2, p. 401405 How to Cite? 
Abstract  Surface broadband emissivity (BBE) in the thermal infrared spectrum is essential for calculating the surface total longwave net radiation in land surface models. However, almost all narrowband emissivities estimated from satellite observations are in the 314μm spectral region. Previous studies converted these narrowband emissivities to BBE over different spectral ranges, such as 314, 812, 813.5, and 814 μm. Errors in the calculated total longwave net radiation must be quantified systematically using these BBEs. Moreover, the best spectral range for longwave net radiation must be determined. The key to addressing these issues is the use of the realistic emissivity spectra. By applying modern radiative transfer tools, we derived the emissivity spectra of water, snow, and minerals at 1200 μm. Using these emissivity spectra, we first investigated the accuracy of replacing allwavelength surface longwave net radiation with the surface longwave net radiation in the 3100, 4100, 2.5100, 2.5200, and 1200μm spectral domains. Surface longwave net radiation at 2.5200 μm was found to be optimal, with a bias and root mean square (rms) of less than 0.928 and 0.993 W/m2, respectively. We calculated the errors when estimating surface longwave net radiation at 2.5200 μm with BBE in different spectral ranges. The results show that BBE at 813.5 μm had the lowest error and the corresponding bias and rms were less than 0.002 and 1.453 W/m2, respectively. When the 2.5200μm surface longwave net radiation calculated by the 813.5μm BBE was used to replace the allwavelength surface longwave net radiation, the average bias and rms were 1.473 and 2.746 W/m2, respectively. Using the most representative emissivity spectra, we derived the conversion formulas for calculating BBE at 813.5 μm from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and the Moderate Resolution Imaging Spectrometer (MODIS) narrowband emissivity products. © 2012 IEEE. 
Persistent Identifier  http://hdl.handle.net/10722/321496 
ISSN  2021 Impact Factor: 5.343 2020 SCImago Journal Rankings: 1.372 
DC Field  Value  Language 

dc.contributor.author  Cheng, Jie   
dc.contributor.author  Liang, Shunlin   
dc.contributor.author  Yao, Yunjun   
dc.contributor.author  Zhang, Xiaotong   
dc.date.accessioned  20221103T02:19:18Z   
dc.date.available  20221103T02:19:18Z   
dc.date.issued  2013   
dc.identifier.citation  IEEE Geoscience and Remote Sensing Letters, 2013, v. 10, n. 2, p. 401405   
dc.identifier.issn  1545598X   
dc.identifier.uri  http://hdl.handle.net/10722/321496   
dc.description.abstract  Surface broadband emissivity (BBE) in the thermal infrared spectrum is essential for calculating the surface total longwave net radiation in land surface models. However, almost all narrowband emissivities estimated from satellite observations are in the 314μm spectral region. Previous studies converted these narrowband emissivities to BBE over different spectral ranges, such as 314, 812, 813.5, and 814 μm. Errors in the calculated total longwave net radiation must be quantified systematically using these BBEs. Moreover, the best spectral range for longwave net radiation must be determined. The key to addressing these issues is the use of the realistic emissivity spectra. By applying modern radiative transfer tools, we derived the emissivity spectra of water, snow, and minerals at 1200 μm. Using these emissivity spectra, we first investigated the accuracy of replacing allwavelength surface longwave net radiation with the surface longwave net radiation in the 3100, 4100, 2.5100, 2.5200, and 1200μm spectral domains. Surface longwave net radiation at 2.5200 μm was found to be optimal, with a bias and root mean square (rms) of less than 0.928 and 0.993 W/m2, respectively. We calculated the errors when estimating surface longwave net radiation at 2.5200 μm with BBE in different spectral ranges. The results show that BBE at 813.5 μm had the lowest error and the corresponding bias and rms were less than 0.002 and 1.453 W/m2, respectively. When the 2.5200μm surface longwave net radiation calculated by the 813.5μm BBE was used to replace the allwavelength surface longwave net radiation, the average bias and rms were 1.473 and 2.746 W/m2, respectively. Using the most representative emissivity spectra, we derived the conversion formulas for calculating BBE at 813.5 μm from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and the Moderate Resolution Imaging Spectrometer (MODIS) narrowband emissivity products. © 2012 IEEE.   
dc.language  eng   
dc.relation.ispartof  IEEE Geoscience and Remote Sensing Letters   
dc.subject  Broadband emissivity (BBE)   
dc.subject  land surface model   
dc.subject  refractive index   
dc.subject  remote sensing   
dc.subject  surface radiation budget   
dc.title  Estimating the optimal broadband emissivity spectral range for calculating surface longwave net radiation   
dc.type  Article   
dc.description.nature  link_to_subscribed_fulltext   
dc.identifier.doi  10.1109/LGRS.2012.2206367   
dc.identifier.scopus  eid_2s2.084869499838   
dc.identifier.volume  10   
dc.identifier.issue  2   
dc.identifier.spage  401   
dc.identifier.epage  405   