Radiometric flight results from the HyperSpectral Imager for Climate Science (HySICS)

Kopp, Greg; Smith, Paul H.; Belting, Chris; Castleman, Zach; Drake, Ginger; Espejo, Joey; Heuerman, Karl; Lanzi, James; Stuchlik, David

doi:10.5194/gi-6-169-2017

Cited by 24 publications

(18 citation statements)

References 18 publications

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“…SABER and all other instruments presently observing Earth from orbit do not carry onboard, absolute radiance standards that can be used to diagnose calibration changes over time, traceable to Système Internationale (SI) units. Two new instruments now in development, CLARREO Pathfinder (Wielicki et al, 2013;Shea et al, 2017;Kopp et al, 2017) and TRUTHS (Fox et al, 2011), are designed for measuring the small changes in top-of-atmosphere radiation associated with changes in tropospheric climate and carry onboard reference standards for detecting instrument calibration drifts for the express purpose of diagnosing and correcting instrument drifts so they do not impact the observation of trends.…”

Section: Introductionmentioning

confidence: 99%

Radiometric Stability of the SABER Instrument

Mlynczak

Daniels

Hunt³

et al. 2020

Earth and Space Science

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The SABER instrument on the National Aeronautics and Space Administration Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics satellite continues to provide a long‐term record of Earth's stratosphere, mesosphere, and lower thermosphere. The SABER data are being used to examine long‐term changes and trends in temperature, water vapor, and carbon dioxide. A tacit, central assumption of these analyses is that the SABER instrument radiometric calibration is not changing with time; that is, the instrument is stable. SABER stratospheric temperatures and those derived from Global Positioning System Radio Occultation measurements are compared to examine SABER's stability. Global Positioning System Radio Occultation measurements are inherently stable due to the accuracy and traceability of the measured phase delay rate to the Système Internationale definition of the second. Differences in global annual mean SABER and COSMIC lower stratospheric temperatures show little significant change with time in the 11 years spanning 2007–2017. From this analysis we infer that SABER temperatures are stable to better than 0.1 to 0.2 K per decade.

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Section: Introductionmentioning

confidence: 99%

Radiometric Stability of the SABER Instrument

Mlynczak

Daniels

Hunt³

et al. 2020

Earth and Space Science

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“…This study also assumes that the instrument is stable within this uncertainty throughout the climate-relevant time periods considered. Although for a real instrument, there may be additional contributions to the measurement uncertainty, changes in that uncertainty over time, or a spectral dependence of that uncertainty (Kopp et al, 2017), this general consideration of the uncertainty serves to demonstrate the capability of our technique.…”

Section: Shannon Entropy Applicationmentioning

confidence: 98%

“…To detect long-term secular climate trends, highly accurate, stable measurements and the ability to monitor and correct for temporal changes in instrument uncertainty are essential (Kopp et al, 2017;Weatherhead et al, 2018;Wielicki et al, 2013). The need for high accuracy is illustrated, in part, by the small interannual variability of shortwave Earth reflectance (Jin et al, 2014).…”

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confidence: 99%

An Entropy Framework for Evaluating Reflectance Observations for Climate Studies

Shea

Lukashin

Liu

et al. 2022

Earth and Space Science

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Direct measurements of spectral shortwave reflectance (300-2,500 nm) averaged over large spatio-temporal scales provide a fundamental understanding of the variability of Earth's climate system that are a result of the physical processes therein. Hyperspectral reflectance measurements-spectrally resolved with narrow, overlapping, and contiguous spectral bands (Goetz, 2009)-are able to resolve spectral features that result from the interaction of shortwave radiation with the atmosphere and surface. The top-of-atmosphere (TOA) shortwave radiation reflected by Earth therefore contains a mixture of unique spectral signatures representative of physical variables including cloud, aerosol, and surface properties and atmospheric composition. Changes in these and other physical variables as they respond to climate forcings can be identified from spectrally resolved TOA shortwave reflectance (Roberts et al., 2011). This therefore suggests that variability in spectral measurements taken by instruments designed with the appropriate requirements can be used to identify and physically attribute changes in climate (Roberts et al., 2014). This study seeks to define a metric that can be used to optimize and justify measurement attributes appropriate for monitoring Earth's climate.Because of the information contained in direct measurements of spectral shortwave radiation, such measurements can serve as a credible climate change record (National Research Council, 2007) and can be used to detect changes in climate, identify climate variance drivers, and quantitatively and objectively compare the variability of two multivariate data sets (

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“…The credible expectation for ACCP is that a hyperspectral solar measurement implementation ought to be in the form of a small class sensor. In the coming years, the CLARREO pathfinder (CPF; Shea et al, 2020) plans to provide traceable, accurate spectra by direct solar calibration; see Kopp et al, (2017) against which other observing systems would be benchmarked. The characteristics of the proposed ACCP spectrometer is expected to largely duplicate those of the CPF.…”

Section: Vswir Spectrometry In the Accp Eramentioning

confidence: 99%

The Spectral Nature of Earth’s Reflected Radiation: Measurement and Science Applications

Stephens

Калашникова

Gristey

et al. 2021

Front. Remote Sens.

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This paper introduces the aerosol, clouds, convection and precipitation (ACCP) program that is currently in the process of defining a number of measurement objectives for NASA that are to be implemented toward the end of the current decade. Since a (solar) visible-shortwave infrared (VSWIR) spectrometer is being considered as part of the ACCP architecture, illustrations of the different ways these measurements will contribute to this program and how these measurements can be expected to advance the science objectives of ACCP are highlighted. These contributions range from 1) constraining cloud radiative process and related estimates of radiative fluxes, 2) scene discrimination, 3) providing aerosol and cloud optical properties, and 4) providing other enhanced information such as the phase of water in clouds, and total column water vapor. The spectral measurements also offer new capabilities that will further enhance the ACCP science such as the discrimination of dust aerosol and the potential for the vertical profiling cloud droplet size in shallow clouds. The areas where the maturity of approaches is lacking is also highlighted as a way of emphasizing research topics to be a focus in the coming years.

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Radiometric flight results from the HyperSpectral Imager for Climate Science (HySICS)

Cited by 24 publications

References 18 publications

Radiometric Stability of the SABER Instrument

Radiometric Stability of the SABER Instrument

An Entropy Framework for Evaluating Reflectance Observations for Climate Studies

The Spectral Nature of Earth’s Reflected Radiation: Measurement and Science Applications

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