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Earthshine observations of the Earth's reflectance

Goode, P. R. and Qiu, J. and Yurchyshyn, V. and Hickey, J. and Chu, M.-C. and Kolbe, E. and Brown, C. T. and Koonin, S. E. (2001) Earthshine observations of the Earth's reflectance. Geophysical Research Letters, 28 (9). pp. 1671-1674. ISSN 0094-8276. doi:10.1029/2000GL012580.

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Regular 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 (∼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 more limited earthshine observations during 1994–1995 show a marginally higher albedo then.

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Brown, C. T.0000-0001-6001-2677
Additional Information:Copyright 2001 by the American Geophysical Union. (Received November 2, 2000; revised March 8, 2001; accepted March 14, 2001.) Paper number 2000GL012580. We wish to thank those involved in earlier earthshine work at BBSO, especially J. Bruls, G. Eychaner, M. Haggerty, J. Maron and H. Zirin. This research was supported in part by grants from NASA (NAG5-7454) and the Western Regional Center of the National Institute for Global Environmental Change.
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National Institute for Global Environmental Change, Western Regional CenterUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20141027-101109172
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50838
Deposited By: George Porter
Deposited On:27 Oct 2014 17:27
Last Modified:10 Nov 2021 19:01

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