Earthshine observations of the earth's reflectance
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AbstractRegular photometric observations of the moon's "ashen light" (earthshine) from the Big Bear Solar Observatory (BBSO) since December 1998 have quantified the earth's optical reflectance. We find large (similar to 5%) daily variations in the reflectance due to large-scale weather changes on the other side of the globe. Separately, we find comparable hourly variations during the course of many nights as the earth's rotation changes that portion of the earth in view. Our data imply an average terrestrial albedo of 0.297 +/-0.005: which agrees with that from simulations based upon both changing snow and ice cover and satellite-derived cloud cover (0.296 +/-0.002). However, we find seasonal variations roughly twice those of the simulation, with the earth being brightest in the spring. Our results suggest that long-term earthshine observations are a useful monitor of the earth's albedo. Comparison with mure limited earthshine observations during 1994-1995 show a marginally higher albedo then.
All Author(s) ListGoode PR, Qiu J, Yurchyshyn V, Hickey J, Chu MC, Kolbe E, Brown CT, Koonin SE
Journal nameGeophysical Research Letters
Volume Number28
Issue Number9
Pages1671 - 1674
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesGeology; Geosciences, Multidisciplinary; GEOSCIENCES, MULTIDISCIPLINARY

Last updated on 2020-01-04 at 03:16