ASDC | DSCOVR_NISTAR_L2_FLX

DSCOVR Level 2

Entry Title: Daytime Earth radiation budget determined from NISTAR and EPIC composites Version 1

Entry ID: DSCOVR_NISTAR_L2_FLX_01

Radiation Budget

Description

Deep Space Climate Observatory (DSCOVR) DSCOVR National Institute of Standards and Technology Advanced Radiometer (NISTAR) was explicitly 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 viewing and illumination. Converting radiance to flux requires using 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 Low Earth Orbit/Geostationary Equatorial Orbit (LEO/GEO) imagers mapped into the EPIC pixels. The EPIC composite also includes ancillary data (i.e., surface type, snow and ice map, skin temperature, precipitable water, etc.) needed for anisotropic factor selections. The anisotropies at the EPIC-pixel are then used to calculate the global mean SW and LW anisotropic factors, then convert the NISTAR SW and LW radiances to fluxes. This product contains the time series of the daytime Earth radiation budget derived from the NISTAR measurements.

DOI

10.5067/NISTAR/DSCOVR/L2_FLX_01

Citation Styles for this Dataset

Resources and Documentation

Earthdata Forum

VIEW RELATED INFORMATION

ALGORITHM DOCUMENTATION

NISTAR Processing Description and Processing Algorithm Overview

ANOMALIES

Notice for Users of NISTAR L1B Data Products

DATA CITATION POLICY

How to cite ASDC data

GENERAL DOCUMENTATION

ASDC Data and Information for DSCOVR
Earth Observation Portal Page for DSCOVR Mission Information

PROCESSING HISTORY

NISTAR Data Format Control Book Specification April 1, 2019

REQUIREMENTS AND DESIGN

DSCOVR Earth Science Instrument Overview

USER'S GUIDE

National Institute of Standards and Technology Advanced Radiometer (NISTAR) User’s Guide - September 9, 2015 For the Flight Operations Team

From GCMD Science Keywords:

LONGWAVE RADIATION
ATMOSPHERIC RADIATION
SHORTWAVE RADIATION

Longwave (LW) Radiation
OLR (Outgoing Longwave Radiation)
Shortwave (SW) Radiation

Data Distribution

File Format(s):

NetCDF-4

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Spatial Information

Spatial Coverage: (S: -90, N: 90), (W: -180, E: 180)
Spatial Coverage Type: Horizontal
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

GLOBAL

Temporal Information

Temporal Coverage: 2017-01-01 - 2017-12-31

Platforms

Solar/Space Observation Satellites

DSCOVR

Deep Space Climate Observatory

NISTAR

National Institute of Standards and Technology Advanced Radiometer

EPIC

Earth Polychromatic Imaging Camera

Metadata Dates

Created on 2017-09-06

Last updated on 2023-08-17