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Potential Scientific Output from the Visible Channels of EPIC Spectroradiometer as Part of the DSCOVR L1 MissionIn addition to 4 UV channels, the EPIC spectroradiometer will provide measurements at 6 visible (and near IR) channels (443,551,680,687.75, 764 and 779.9 nm) at roughly 10 km spatial resolution. The scattering angles are near backscattering and vary between 165 and 176 degree. Two pairs {680 and 687.75 nm} and {764 and 779.9 nm} represent 02 B- and A-bands (and their references) channels; they will be used for cloud height measurements over land and ocean. The B-band channel will contribute to the more absorbing A-band measurements over bright vegetation. A pair {680 and 779.9 nm} will be used for retrieving vegetation properties. Due to the special EPIC geometry, the illuminated part of the leaves will be always observed. As a result, in additional to the traditional Leaf Area Index (LAI), these observations for the first time will provide the sunlit fraction of LAI. Since the sunlit and shaded leaves exhibit different photosynthetic response to incident radiation, these measurements will help to improve global ecological and biogeochemistry models. Finally, a pair {443 and 551 nm} will be used for atmospheric correction. As a by-product of the atmospheric correction algorithm, we also expect to get aerosol optical thickness (AOT) and surface bidirectional reflection function (BRF). The presentation will briefly overview the proposed science algorithms.
Document ID
20120011569
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Marshak, Alexander (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herman, Jay (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
December 5, 2011
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
GSFC.ABS.01067.2012
Meeting Information
Meeting: 2011 AGU Fall Meeting
Location: San Francisco, CA
Country: United States
Start Date: December 5, 2011
End Date: December 9, 2011
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Public Use Permitted.

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