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Titre du document / Document title

Earthshine observations of the Earth's reflectance

Auteur(s) / Author(s)

GOODE P. R. (1) ; QIU J. (1) ; YURCHYSHYN V. (1) ; HICKEY J. (1) ; CHU M-C. (2) ; KOLBE E. (3) ; BROWN C. T. (4) ; KOONIN S. E. (4) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Big Bear Solar Observatory, New Jersey Institute of Technology, Newark, NJ 07102, ETATS-UNIS
(2) Department of Physics, The Chinese University of Hong Kong, Shatin, HONG-KONG
(3) Departement für Physik and Astronomic, Universität Basel, Basel, SUISSE
(4) W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA 91125, ETATS-UNIS

Résumé / Abstract

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.

Revue / Journal Title

Geophysical research letters    ISSN  0094-8276   CODEN GPRLAJ 

Source / Source

2001, vol. 28, no9, pp. 1671-1674 (12 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

Reflectance

;

Photometric observation

;

Daily variation

;

Earth rotation

;

Albedo

;

Snow cover

;

Ice

;

Cloudiness

;

Seasonal variation

;

Moon

;

Mots-clés français / French Keywords

Coefficient réflexion

;

Observation photométrique

;

Variation journalière

;

Rotation Terre

;

Albédo

;

Couverture neige

;

Glace

;

Nébulosité

;

Variation saisonnière

;

Lune

;

Mots-clés espagnols / Spanish Keywords

Coeficiente reflexión

;

Observación fotométrica

;

Variación diaria

;

Rotación tierra

;

Albedo

;

Cubierta nieve

;

Hielo

;

Nebulosidad

;

Variación estacional

;

Luna

;

Localisation / Location

INIST-CNRS, Cote INIST : 16687, 35400009883654.0010

Nº notice refdoc (ud4) : 1034923



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