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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/amt-2017-155
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
14 Jul 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Synoptic Ozone, Cloud Reflectivity, and Erythemal Irradiance from Sunrise to Sunset for the Whole Earth as viewed by the DSCOVR spacecraft from Lagrange-1
Jay Herman1, Liang Huang2, Richard McPeters3, Jerry Ziemke3, Alexander Cede4, and Karin Blank3 1University of Maryland Baltimore County, Maryland
2Science Systems and Applications, Lanham, Maryland
3NASA Goddard Space Flight Center, Greenbelt, Maryland
4SciGlob Instruments and Services, Maryland
Abstract. The EPIC instrument onboard the DSCOVR spacecraft, located near the Earth-Sun gravitational plus centrifugal force balance point, Lagrange-1, measures Earth reflected radiances in 10 wavelength channels ranging from 317.5 nm to 779.5 nm. Of these channels, four are in the UV range 317.5, 325, 340, and 388 nm, which are used to retrieve O3, 388 nm scene reflectivity (LER Lambert Equivalent Reflectivity), SO2, and aerosol properties. These quantities are derived synoptically for the entire sunlit globe from sunrise to sunset every 68 minutes or 110 minutes for summer or winter at the receiving antenna in Wallops Island, Virginia, respectively. Depending on solar zenith angle, either 317.5 or 325 nm channels are combined with 340 and 388 nm to derive ozone amounts. As part of the ozone algorithm, the 388 nm channel is used to derive LER. The retrieved ozone amounts and LER are combined to derive the erythemal irradiance for the sunlit Earth's surface at a resolution of 18 × 18 km2 near the center of the Earth's disk using a computationally efficient approximation to a radiative transfer calculation of irradiance. Corrections are made for altitude above sea level and for the reduced transmission by clouds based on retrieved LER.

Citation: Herman, J., Huang, L., McPeters, R., Ziemke, J., Cede, A., and Blank, K.: Synoptic Ozone, Cloud Reflectivity, and Erythemal Irradiance from Sunrise to Sunset for the Whole Earth as viewed by the DSCOVR spacecraft from Lagrange-1, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-155, in review, 2017.
Jay Herman et al.
Jay Herman et al.
Jay Herman et al.

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Short summary
The DSCOVR spacecraft we launched to an orbit located near the Earth-Sun gravitational plus centrifugal force balance point known as Lagrange-1. One of the earth viewing instruments, EPIC, measures Earth reflected radiances in 10 wavelength channels ranging from 317.5 nm to 779.5 nm. We use the UV channels to retrieve O3, scene reflectivity, and to derive erythemal flux (sunburn) at the earth's surface.
The DSCOVR spacecraft we launched to an orbit located near the Earth-Sun gravitational plus...
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