Changes in Earth's Reflectance over the Past Two Decades-Reference-Cited by-同舟云学术

Changes in Earth's Reflectance over the Past Two Decades

Published:2004-05-28 Issue:5675 Volume:304 Page:1299-1301
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Pallé E.¹²,Goode P. R.¹²,Montañés-Rodríguez P.¹²,Koonin S. E.¹²

Affiliation:

1. Big Bear Solar Observatory, New Jersey Institute of Technology, 40386 North Shore Lane, Big Bear City, CA 92314, USA.

2. W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference15 articles.

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3. The ERBE instruments were flown on the ERBS NOAA-9 and NOAA-10 satellites from late 1984 to 1990 (asd-www.larc.nasa.gov). ScaRab/Meteor and ScaRaB/Ressur also measured Earth's albedo during 1994–1995 and 1998–1999 respectively (www.lmd.polytechnique.fr/∼Scarab/). In 1998 CERES began taking albedo measurements (asd-www.larc.nasa.gov/ceres/) and the Geostationary Earth Radiation Budget Experiment (GERB) the first broadband radiometer on a geostationary satellite has been in operation since December 2002 (www.sp.ph.ic.ac.uk/gerb/). The future satellite missions EARTHSHINE (www.sstd.rl.ac.uk) and TRIANA (on hold) (triana.gsfc.nasa.gov) may also contribute by observing the full Earth disk reflectance from the privileged deep-space position of the L1 Lagrange point.

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5. When referring to SW reflectance as observed by ES we mean the visible region from 400 to 700 nm covered by our detector.

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