AI Article Synopsis
- NASA's Earth Polychromatic Imaging Camera (EPIC) on the DSCOVR satellite observes the entire sunlit Earth every 65 to 110 minutes, providing valuable data on reflectance variations.
- Initial findings indicate that Earth's reflectance is primarily influenced by the land-ocean ratio and cloud distribution over the sunlit areas.
- Key observations reveal that diurnal changes are linked to land-ocean exposure, daily reflectance shows seasonal patterns, and these patterns are largely shaped by the distribution of oceanic clouds at different latitudes.
Article Abstract
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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800679 | PMC |
| http://dx.doi.org/10.3390/rs10020254 | DOI Listing |
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