1. Climatology of the Combined ASTER MODIS Emissivity over Land (CAMEL) Version 2
- Author
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Eva Borbas, Simon J. Hook, Michelle Loveless, Kerry Cawse-Nicholson, Glynn Hulley, and Robert O. Knuteson
- Subjects
010504 meteorology & atmospheric sciences ,emissivity ,infrared ,surface ,land ,radiation ,hyperspectral ,climatology ,CAMEL ,MODIS ,Science ,0211 other engineering and technologies ,02 engineering and technology ,Land cover ,Infrared atmospheric sounding interferometer ,01 natural sciences ,Advanced Spaceborne Thermal Emission and Reflection Radiometer ,Emissivity ,Radiative transfer ,021101 geological & geomatics engineering ,0105 earth and related environmental sciences ,RTTOV ,Hyperspectral imaging ,Climatology ,General Earth and Planetary Sciences ,Environmental science ,Moderate-resolution imaging spectroradiometer - Abstract
The Combined ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) MODIS (Moderate Resolution Imaging Spectroradiometer) Emissivity over Land (CAMEL) Version 2 (V002) has been available since March 2019 from the NASA LP DAAC (Land Processes Distributed Active Archive Center) and provides global, monthly infrared land surface emissivity and uncertainty at 0.05 degrees (~5 km) resolution. A climatology of the CAMEL V002 product is now available at the same spatial, temporal, and spectral resolution, covering the CAMEL record from 2000 to 2016. Characterization of the climatology over case sites and IGBP (International Geosphere-Biosphere Programme) land cover categories shows the climatology is a stable representation of the monthly CAMEL emissivity. Time series of the monthly CAMEL V002 product show realistic seasonal changes but also reveal subtle artifacts known to be from calibration and processing errors in the MODIS MxD11 emissivity. The use of the CAMEL V002 climatology mitigates many of these time dependent errors by providing an emissivity estimate which represents the complete 16-year record. The CAMEL V002 climatology’s integration into RTTOV (Radiative Transfer for TOVS) v12 is demonstrated through the simulation of IASI (Infrared Atmospheric Sounding Interferometer) radiances. Improved stability in CAMEL Version 3 is expected in the future with the incorporation of the new MxD21 and VIIRS VNP21 emissivity products in MODIS Collection 6.1.
- Published
- 2021