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Changes in Earth’s Reflectance over the Past Two Decades

Pallé, E. and Goode, P. R. and Montañés-Rodríguez, P. and Koonin, S. E. (2004) Changes in Earth’s Reflectance over the Past Two Decades. Science, 304 (5675). pp. 1299-1301. ISSN 0036-8075. doi:10.1126/science.1094070.

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We correlate an overlapping period of earthshine measurements of Earth's reflectance (from 1999 through mid-2001) with satellite observations of global cloud properties to construct from the latter a proxy measure of Earth's global shortwave reflectance. This proxy shows a steady decrease in Earth's reflectance from 1984 to 2000, with a strong climatologically significant drop after 1995. From 2001 to 2003, only earthshine data are available, and they indicate a complete reversal of the decline. Understanding how the causes of these decadal changes are apportioned between natural variability, direct forcing, and feedbacks is fundamental to confidently assessing and predicting climate change.

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Additional Information:© 2004 American Association for the Advancement of Science. 26 November 2003; accepted 21 April 2004. This research was supported in part by a grant from NASA (NAG5-11007). The cloud ISCCP D1 data sets were obtained from the NASA Langley Research Center Atmospheric Sciences Data Center. We are grateful to Y. Yung, B. Soden, T. Schneider, and five anonymous referees for their comments on drafts of this paper.
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Issue or Number:5675
Record Number:CaltechAUTHORS:20141119-110806555
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Official Citation:Pallé, E., Goode, P. R., Montañés-Rodríguez, P., & Koonin, S. E. (2004). Changes in Earth's Reflectance over the Past Two Decades. Science, 304(5675), 1299-1301. doi: 10.1126/science.1094070
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51962
Deposited On:19 Nov 2014 21:17
Last Modified:10 Nov 2021 19:18

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