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  • Daytime Earth radiation budget determined from NISTAR and EPIC composites Version 1

    https://cmr.earthdata.nasa.gov/search/concepts/C1573253314-LARC_ASDC.xml
    Description:

    Deep Space Climate Observatory (DSCOVR) DSCOVR National Institute of Standards and Technology Advanced Radiometer (NISTAR) was specifically designed to measure the global daytime radiation budget for an entire hemisphere using active cavity radiometers for three channels: total (0.2 - 100 um), SW (0.2 - 4.0 um), and near-infrared (0.7 - 4.0 um). To derive the Earth Radiation Budget (ERB) from NISTAR measurements, the Short Wave (SW) radiances need to be unfiltered first before they can be subtracted from the total to yield the Long Wave (LW) (4 - 100 um) radiances. Additionally, the Earth's surface and atmosphere are anisotropic reflectors and emitters resulting in a relatively complex variation of radiance leaving the Earth as a function of the viewing and illumination. To convert radiance to flux requires the use of angular distribution models (ADMs) to account for the emittance and reflectance anisotropies. The anisotropies are characterized for all Earth Polychromatic Imaging Camera (EPIC) pixels by using the Clouds and the Earth’s Radiant Energy System (CERES) empirical angular distribution models (ADMs), which are functions of scene types which are defined using many variables including surface type, cloud amount, cloud phase, and optical depth, and water vapor. EPIC composite product is used to provide accurate scene type information. The EPIC composites are generated from cloud property retrievals from LEO/GEO imagers mapped into the EPIC pixels. Ancillary data (i.e. surface type, snow and ice map, skin temperature, precipitable water, etc.) needed for anisotropic factor selections are also included in the EPIC composite. The anisotropies at the EPIC-pixel are then used to calculate the global mean SW and LW anisotropic factors, which are then used to convert the NISTAR SW and LW radiances to fluxes. This product contains the time series of daytime Earth radiation budget derived from the NISTAR measurements.

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    LARC_ASDC Short Name: DSCOVR_NISTAR_L2_FLX Version ID: 01 Unique ID: C1573253314-LARC_ASDC

  • Deep Space Climate Observatory (DSCOVR)

    https://cmr.earthdata.nasa.gov/search/concepts/C1214557875-NOAA_NCEI.xml
    Description:

    The Deep Space Climate ObserVatoRy (DSCOVR) satellite is a NOAA operated asset to be located at the L1 point. The primary space weather instrument is the PlasMag sensor complement consisting of a magnetometer (MAG), which will measure the local vector magnetic field, and a Faraday Cup (FC), which will measure the solar wind proton/alpha bulk properties (wind speed, density and temperature). The PlasMag data will be used for monitoring solar wind conditions in order to provide forecasts and nowcasts to SWPC customers. The PlasMag data will also be made available to scientists for sensor cal/val and for research purposes. DSCOVR is scheduled to launch in 2QFY15. All data present in the Archive from earlier dates are data used for ground testing, and do not represent the space environment. Initial Operational Capability (IOC) is planned for 3QFY15 as it starts its transit from near-earth orbit. Final Operational Capability (FOC) will be achieved after the satellite reaches the L1 location in 4QFY15. End Of Life (EOL) is anticipated to be December 2019. The Archive will plan on receiving data from IOC to EOL and archiving the data in accordance with Data Center policies.

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    NOAA_NCEI Short Name: gov.noaa.ngdc.stp.swx.satellite-systems_dscovr Version ID: Not provided Unique ID: C1214557875-NOAA_NCEI

  • Deep Space Climate Observatory Earth Polychromatic Imaging Camera Level 2 UV Aerosol Products Version 1

    https://cmr.earthdata.nasa.gov/search/concepts/C1418602594-LARC_ASDC.xml
    Description:

    The Aerosol UV product provides aerosol and UV products in three tiers. Tier 1 products include Absorbing Aerosol Index (AAI) and above-cloud-aerosol optical depth (ACAOD). Tier 2 includes a four-parameter retrieval algorithm combining of UV-VIS observations: aerosol optical depth (AOD), angstrom exponent (AE), near UV single scattering albedo (SSA), and effective aerosol layer height (ALH). Cloud masking will be carried out with collocated high resolution LEO observations. Tier 3 contains Experimental Products, including research work on using EPIC’s glint and off-glint observations to characterize spectral aerosol absorption. Tier 3 research includes ways of estimating the height of aerosol layers over the ocean using EPIC’s channels in the Oxygen-A and B bands.

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    Minimum Bounding Rectangle: -90 -180 90 180

    LARC_ASDC Short Name: DSCOVR_EPIC_L2_AER Version ID: 01 Unique ID: C1418602594-LARC_ASDC

  • Deep Space Climate Observatory Earth Polychromatic Imaging Camera Level 2 UV Aerosol Products Version 2

    https://cmr.earthdata.nasa.gov/search/concepts/C1692406298-LARC_ASDC.xml
    Description:

    Deep Space Climate Observatory (DSCOVR) Enhanced Polychromatic Imaging Camera (EPIC) observations at 340 and 388 nm are used to derive near UV aerosol properties. The EPIC aerosol retrieval algorithm (EPICAERUV) uses a set of aerosol models to account for the presence of carbonaceous aerosols from biomass burning and wild fires (BIO), desert dust (DST), and sulfate-based (SLF) aerosols. These aerosol models are identical to those assumed in the OMI algorithm (Torres et al., 2007; Jethva and Torres, 2011). Aerosol data products generated by the EPICAERUV algorithm are aerosol extinction optical depth (AOD) and single scattering albedo (SSA) at 340, 388 and 500 nm for clear sky conditions. AOD of absorbing aerosols above clouds is also reported (Jethva et al., 2018). In addition, the UV Aerosol Index (UVAI) is calculated from 340 and 388 nm radiances for all sky conditions. AOD is a dimensionless measure of the extinction of light y aerosols due to the combined effect of scattering and absorption. SSA represents the fraction of extinction solely due to aerosol scattering effects. The AI is simply a residual parameter that quantifies the difference in spectral dependence between measured and calculated near UV radiances assuming a purely molecular atmosphere. Because most of the observed positive residuals are associated with the presence of absorbing aerosols, this parameter is commonly known as the UV Absorbing Aerosol Index. EPIC-derived aerosol parameters are reported at a 10 km (nadir) resolution.

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    Minimum Bounding Rectangle: -90 -180 90 180

    LARC_ASDC Short Name: DSCOVR_EPIC_L2_AER Version ID: 02 Unique ID: C1692406298-LARC_ASDC

  • Deep Space Climate Observatory National Institute of Standards and Technology Advanced Radiometer Level 1A Radiance, Version 3

    https://cmr.earthdata.nasa.gov/search/concepts/C1863115716-LARC_ASDC.xml
    Description:

    DSCOVR_NISTAR_L1A is the Deep Space Climate Observatory (DSCOVR) National Institute of Standards & Technology Advanced Radiometer (NISTAR) Level 1A Radiance, Version 3 data product. NISTAR is a 4-band radiometer onboard NOAA’s DSCOVR spacecraft located at the Earth-Sun Lagrange-1 (L-1) point, from which vantage it continuously measures the reflected and emitted radiances of the sunlit face of the Earth. These measurements provide an accurate energy balance measurement that improves our understanding of the Earth’s radiation budget. NISTAR employs three electrical substitution radiometers and a photodiode to measure reflected sunlight and infrared emission from the Earth. NISTAR measures the absolute irradiance integrated over the entire sunlit face of Earth in four broadband channels minute-by-minute. NISTAR has a 1º field of view (FOV) that acts as one large pixel that encompasses the entire sunlit side of the Earth, and a 7º field of regard. The four measurement bands and their uses are: 1) Total Radiation – 0.2 µm to 100 µm: total radiant power in the UV, visible, and infrared wavelengths emerging from Earth. 2) Total Solar Reflected – 0.2 µm to 4 µm: reflected solar radiance in UV, visible, and near infrared wavelengths from Earth. 3) Near Infrared Solar Reflected – 0.7 µm to 4 µm: reflected near infrared solar radiation from Earth. 4) Photodiode – 0.2 µm to 1.1 µm: tracks the stability of the filters, and to verify co-alignment of NISTAR and EPIC. The Level 1A products have been converted to engineering units, but retain their one to one associations with the items in the raw telemetry from which they were derived. These data products are in HDF5 format.

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    LARC_ASDC Short Name: DSCOVR_NISTAR_L1A Version ID: 3 Unique ID: C1863115716-LARC_ASDC

  • Deep Space Climate Observatory National Institute of Standards and Technology Advanced Radiometer Level 1B Radiance Filtered, Version 3

    https://cmr.earthdata.nasa.gov/search/concepts/C1863012444-LARC_ASDC.xml
    Description:

    DSCOVR_NISTAR_L1B_FILTERED_3 is the Deep Space Climate Observatory (DSCOVR) National Institute of Standards & Technology Advanced Radiometer (NISTAR) Level 1B Radiance Filtered, Version 3 data product. NISTAR is a 4-band radiometer onboard NOAA’s DSCOVR spacecraft located at the Earth-Sun Lagrange-1 (L-1) point, from which vantage it continuously measures the reflected and emitted radiances of the sunlit face of the Earth. These measurements provide an accurate energy balance measurement that improves our understanding of the Earth’s radiation budget. NISTAR employs three electrical substitution radiometers and a photodiode to measure reflected sunlight and infrared emission from the Earth. NISTAR measures the absolute irradiance integrated over the entire sunlit face of Earth in four broadband channels minute-by-minute. NISTAR has a 1º field of view (FOV) that acts as one large pixel that encompasses the entire sunlit side of the Earth, and a 7º field of regard. The four measurement bands and their uses are: 1) Total Radiation – 0.2 µm to 100 µm: total radiant power in the UV, visible, and infrared wavelengths emerging from Earth. 2) Total Solar Reflected – 0.2 µm to 4 µm: reflected solar radiance in UV, visible, and near infrared wavelengths from Earth. 3) Near Infrared Solar Reflected – 0.7 µm to 4 µm: reflected near infrared solar radiation from Earth. 4) Photodiode – 0.2 µm to 1.1 µm: tracks the stability of the filters, and to verify co-alignment of NISTAR and EPIC. These Level 1B products are the irradiance values computed from Level 1A data collected while the instrument was aimed at the Earth. These data products are in HDF5 format.

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    LARC_ASDC Short Name: DSCOVR_NISTAR_L1B_FILTERED Version ID: 3 Unique ID: C1863012444-LARC_ASDC

  • Deep Space Climate Observatory National Institute of Standards and Technology Advanced Radiometer Level 1B Radiance, Version 3

    https://cmr.earthdata.nasa.gov/search/concepts/C1863121291-LARC_ASDC.xml
    Description:

    DSCOVR_NISTAR_L1B_3 is the Deep Space Climate Observatory (DSCOVR) National Institute of Standards & Technology Advanced Radiometer (NISTAR) Level 1B version 3 data product. NISTAR is a 4-band radiometer onboard NOAA’s DSCOVR spacecraft located at the Earth-Sun Lagrange-1 (L-1) point, from which vantage it continuously measures the reflected and emitted radiances of the sunlit face of the Earth. These measurements provide an accurate energy balance measurement that improves our understanding of the Earth’s radiation budget. NISTAR employs three electrical substitution radiometers and a photodiode to measure reflected sunlight and infrared emission from the Earth. NISTAR measures the absolute irradiance integrated over the entire sunlit face of Earth in four broadband channels minute-by-minute. NISTAR has a 1º field of view (FOV) that acts as one large pixel that encompasses the entire sunlit side of the Earth, and a 7º field of regard. The four measurement bands and their uses are: 1) Total Radiation – 0.2 µm to 100 µm: total radiant power in the UV, visible, and infrared wavelengths emerging from Earth. 2) Total Solar Reflected – 0.2 µm to 4 µm: reflected solar radiance in UV, visible, and near infrared wavelengths from Earth. 3) Near Infrared Solar Reflected – 0.7 µm to 4 µm: reflected near infrared solar radiation from Earth. 4) Photodiode – 0.2 µm to 1.1 µm: tracks the stability of the filters, and to verify co-alignment of NISTAR and EPIC. These Level 1B products are the irradiance values computed from Level 1A data collected while the instrument was aimed at the Earth. These data products are in HDF5 format.

    Links: Temporal Extent: Spatial Extent:
    Minimum Bounding Rectangle: -90 -180 90 180

    LARC_ASDC Short Name: DSCOVR_NISTAR_L1B Version ID: 3 Unique ID: C1863121291-LARC_ASDC

  • DSCOVR EPIC CLOUD Product Version 02

    https://cmr.earthdata.nasa.gov/search/concepts/C1707832596-LARC_ASDC.xml
    Description:

    Deep Space Climate Observatory (DSCOVR) cloud products will be derived from Earth Polychromatic Imaging Camera (EPIC) observations in the ultraviolet and visible spectra. Since EPIC is not equipped with a spectral channel in the shortwave or mid-wave infrared that is sensitive to cloud effective radius (CER), Cloud Optical Thickness (COT) will be inferred from a single visible channel with the assumption of appropriate CER values for liquid and ice phase clouds. One month of Aqua MODerate-resolution Imaging Spectroradiometer (MODIS) daytime granules from April 2005 is selected for investigating cloud phase sensitivity, and a subset of these granules that has similar EPIC Sun-view geometry is selected for investigating COT uncertainties. EPIC COT retrievals are simulated with the same algorithm as the operational MODIS cloud products (MOD06), except using fixed phase-dependent CER values. Uncertainty estimates are derived by comparing the single-channel COT retrievals with the baseline bi-spectral MODIS retrievals. Results show that a single-channel COT retrieval is feasible for EPIC. For ice clouds, single-channel retrieval errors are minimal (< 2 %) due to the particle size insensitivity of the assumed ice crystal (i.e., severely roughened aggregate of hexagonal columns) scattering properties at visible wavelengths, while for liquid clouds the error is mostly limited to within 10 %, although for thin clouds (COT < 2) the error can be higher. Potential uncertainties in EPIC cloud masking and cloud temperature retrievals are not considered in this study.

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    LARC_ASDC Short Name: DSCOVR_EPIC_L2_CLOUD Version ID: 02 Unique ID: C1707832596-LARC_ASDC

  • DSCOVR EPIC Cloud Products

    https://cmr.earthdata.nasa.gov/search/concepts/C1450266297-LARC_ASDC.xml
    Description:

    DSCOVR cloud products will be derived from Earth Polychromatic Imaging Camera (EPIC) observations in the ultraviolet and visible spectra. Since EPIC is not equipped with a spectral channel in the shortwave or mid-wave infrared that is sensitive to cloud effective radius (CER), Cloud Optical Thickness (COT) will be inferred from a single visible channel with the assumption of appropriate CER values for liquid and ice phase clouds. One month of Aqua MODerate-resolution Imaging Spectroradiometer (MODIS) daytime granules from April 2005 is selected for investigating cloud phase sensitivity, and a subset of these granules that has similar EPIC Sun-view geometry is selected for investigating COT uncertainties. EPIC COT retrievals are simulated with the same algorithm as the operational MODIS cloud products (MOD06), except using fixed phase-dependent CER values. Uncertainty estimates are derived by comparing the single-channel COT retrievals with the baseline bi-spectral MODIS retrievals. Results show that a single-channel COT retrieval is feasible for EPIC. For ice clouds, single-channel retrieval errors are minimal (< 2 %) due to the particle size insensitivity of the assumed ice crystal (i.e., severely roughened aggregate of hexagonal columns) scattering properties at visible wavelengths, while for liquid clouds the error is mostly limited to within 10 %, although for thin clouds (COT < 2) the error can be higher. Potential uncertainties in EPIC cloud masking and cloud temperature retrievals are not considered in this study.

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    Minimum Bounding Rectangle: -90 -180 90 180

    LARC_ASDC Short Name: DSCOVR_EPIC_L2_CLOUD Version ID: 01 Unique ID: C1450266297-LARC_ASDC

  • DSCOVR EPIC L2 MAIAC Atmospheric Correction data product

    https://cmr.earthdata.nasa.gov/search/concepts/C1451664065-LARC_ASDC.xml
    Description:

    The Level 2 Multi-Angle Implementation of Atmospheric Correction (MAIAC) product contains atmospherically corrected spectral bidirectional reflectance factors (BRF, or surface reflectance) and bidirectional reflectance distribution function (BRDF) represented by 3 parameters of the Ross-Thick Li-Sparse model. It also provides several atmospheric quantities including cloud mask and aerosol optical depth (AOD) required for atmospheric correction. The parameters are distributed at 10 km sinusoidal grid and 1 to 2-hour temporal frequency. The atmospherically corrected surface reflectance and BRDF are fundamental quantities for climate modeling and vegetation studies. They are also important input to the Deep Space Climate Observatory (DSCOVR) Earth Polychromatic Imaging Camera (EPIC) Vegetation Earth System Data Record (VESDR) product. Due to high temporal and full disk global coverage, MAIAC EPIC AOD is a useful complementary dataset to MODIS and VIIRS global aerosol products.

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    Minimum Bounding Rectangle: -90 -180 90 180

    LARC_ASDC Short Name: DSCOVR_EPIC_L2_MAIAC Version ID: 01 Unique ID: C1451664065-LARC_ASDC