Showing papers by "Fred A. Best published in 2016"
02 May 2016
TL;DR: The Absolute Radiance Interferometer (ARI) IR prototype employs an OARS, developed under the NASA Instrument Incubator Program for CLARREO, for on-orbit calibration verification to better than 0.1 K 3 sigma as discussed by the authors.
Abstract: Application of the principles of metrology for the NASA Climate Absolute Radiance and Refractivity Observatory (CLARREO) infrared high spectral resolution measurements is presented, starting with the use of a Standard International (SI) reference source on orbit, developing uncertainty traceability for intercalibration to other spaceborne sensors, and finally tracing the direct effects of radiance uncertainty on climate products originating from state parameter retrievals. The Absolute Radiance Interferometer (ARI) IR prototype employs an On-orbit Absolute Radiance Standard (OARS), developed under the NASA Instrument Incubator Program for CLARREO, for on-orbit calibration verification to better than 0.1 K 3-sigma. The OARS consists of a variable temperature, high emissivity blackbody with temperature calibration established to better than 16 mK on-orbit and provision for on-orbit emissivity monitoring. The temperature scale is established using miniature melt cells of Ga, H2O, and Hg. Transferring the high accuracy of ARI measurements to other IR instruments, especially the high spectral resolution operational sounders (AIRS, CrIS and IASI), is an important objective of CLARREO. The mathematical approach to rigorous traceability of sampling uncertainties is explained and applied in simulations of the intercalibration process. Results show that it will be possible to make intercomparisons of better than 0.05 K 3-sigma with just 6 months of observations from a single CLARREO in true polar orbit. Finally, the effects of radiance perturbations representing realistic uncertainties (for the CrIS on Suomi NPP) on retrieved temperature and water vapor profiles are evaluated. The results demonstrate a stable, physically reasonable impact of Dual regression retrievals.
3 citations
14 Nov 2016
TL;DR: The infrared Absolute Radiance Interferometer (ARI) was developed for NASA's Climate Absolute Radiant and Reflectivity Observatory (CLARREO) and brought to a Technical Readiness Level of 6 as mentioned in this paper.
Abstract: The infrared Absolute Radiance Interferometer prototype instrument was developed for NASA's Climate Absolute Radiance and Reflectivity Observatory (CLARREO), and brought to a Technical Readiness Level of 6. The current status of the ARI is presented.
2 citations
07 Apr 2016
TL;DR: The CLARREO (Climate Absolute Radiance and Refractivity Observatory) is a new satellite mission designed to resolve this challenge by achieving advances of a factor of 10 to 15 for reflected solar spectra and 3 to 5 for thermal infrared spectra as discussed by the authors.
Abstract: This presentation will summarize a new quantitative approach to determining the required accuracy for climate change observations. Using this metric, most current global satellite observations struggle to meet this accuracy level. CLARREO (Climate Absolute Radiance and Refractivity Observatory) is a new satellite mission designed to resolve this challenge is by achieving advances of a factor of 10 for reflected solar spectra and a factor of 3 to 5 for thermal infrared spectra. The CLARREO spectrometers can serve as SI traceable benchmarks for the Global Satellite Intercalibration System (GSICS) and greatly improve the utility of a wide range of LEO and GEO infrared and reflected solar satellite sensors for climate change observations (e.g. CERES, MODIS, VIIIRS, CrIS, IASI, Landsat, etc). A CLARREO Pathfinder mission for flight on the International Space Station is included in the U.S. Presidentâ€"TM"s fiscal year 2016 budget, with launch in 2019 or 2020. Providing more accurate decadal change trends can in turn lead to more rapid narrowing of key climate science uncertainties such as cloud feedback and climate sensitivity. A new study has been carried out to quantify the economic benefits of such an advance and concludes that the economic value is ~ $9 Trillion U.S. dollars. The new value includes the cost of carbon emissions reductions.
1 citations