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EPIC Spectral Observations of Variability in Earth’s Global Reflectance
NASA’s Earth Polychromatic Imaging Camera (EPIC) onboard NOAA’s Deep Space Climate Observatory (DSCOVR) satellite observes the entire sunlit Earth every 65 to 110 min from the Sun–Earth Lagrangian L1 point. This paper presents initial EPIC shortwave spectral observations of the sunlit Earth reflecta...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800679/ https://www.ncbi.nlm.nih.gov/pubmed/31632826 http://dx.doi.org/10.3390/rs10020254 |
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author | Yang, Weidong Marshak, Alexander Várnai, Tamás Knyazikhin, Yuri |
author_facet | Yang, Weidong Marshak, Alexander Várnai, Tamás Knyazikhin, Yuri |
author_sort | Yang, Weidong |
collection | PubMed |
description | NASA’s Earth Polychromatic Imaging Camera (EPIC) onboard NOAA’s Deep Space Climate Observatory (DSCOVR) satellite observes the entire sunlit Earth every 65 to 110 min from the Sun–Earth Lagrangian L1 point. This paper presents initial EPIC shortwave spectral observations of the sunlit Earth reflectance and analyses of its diurnal and seasonal variations. The results show that the reflectance depends mostly on (1) the ratio between land and ocean areas exposed to the Sun and (2) cloud spatial and temporal distributions over the sunlit side of Earth. In particular, the paper shows that (a) diurnal variations of the Earth’s reflectance are determined mostly by periodic changes in the land–ocean fraction of its the sunlit side; (b) the daily reflectance displays clear seasonal variations that are significant even without including the contributions from snow and ice in the polar regions (which can enhance daily mean reflectances by up to 2 to 6% in winter and up to 1 to 4% in summer); (c) the seasonal variations of the sunlit Earth reflectance are mostly determined by the latitudinal distribution of oceanic clouds. |
format | Online Article Text |
id | pubmed-6800679 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
record_format | MEDLINE/PubMed |
spelling | pubmed-68006792019-10-19 EPIC Spectral Observations of Variability in Earth’s Global Reflectance Yang, Weidong Marshak, Alexander Várnai, Tamás Knyazikhin, Yuri Remote Sens (Basel) Article NASA’s Earth Polychromatic Imaging Camera (EPIC) onboard NOAA’s Deep Space Climate Observatory (DSCOVR) satellite observes the entire sunlit Earth every 65 to 110 min from the Sun–Earth Lagrangian L1 point. This paper presents initial EPIC shortwave spectral observations of the sunlit Earth reflectance and analyses of its diurnal and seasonal variations. The results show that the reflectance depends mostly on (1) the ratio between land and ocean areas exposed to the Sun and (2) cloud spatial and temporal distributions over the sunlit side of Earth. In particular, the paper shows that (a) diurnal variations of the Earth’s reflectance are determined mostly by periodic changes in the land–ocean fraction of its the sunlit side; (b) the daily reflectance displays clear seasonal variations that are significant even without including the contributions from snow and ice in the polar regions (which can enhance daily mean reflectances by up to 2 to 6% in winter and up to 1 to 4% in summer); (c) the seasonal variations of the sunlit Earth reflectance are mostly determined by the latitudinal distribution of oceanic clouds. 2018 /pmc/articles/PMC6800679/ /pubmed/31632826 http://dx.doi.org/10.3390/rs10020254 Text en licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yang, Weidong Marshak, Alexander Várnai, Tamás Knyazikhin, Yuri EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title | EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title_full | EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title_fullStr | EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title_full_unstemmed | EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title_short | EPIC Spectral Observations of Variability in Earth’s Global Reflectance |
title_sort | epic spectral observations of variability in earth’s global reflectance |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800679/ https://www.ncbi.nlm.nih.gov/pubmed/31632826 http://dx.doi.org/10.3390/rs10020254 |
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