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F. Combes, D. Barret and T. Contini (eds) THE GREEN VEGETATION AS A BIOSIGNATURE ON
 

Summary: SF2A 2003
F. Combes, D. Barret and T. Contini (eds)
THE GREEN VEGETATION AS A BIOSIGNATURE ON
EARTH AND EARTH-LIKE PLANETS: POLDER DATA AND
EARTHSHINE OBSERVATIONS
Arnold, L.1, BrŽeon, F.M.2, Brewer, S.3, Guiot, J.3, Jacquemoud, S.4 and
Schneider, J.5
Abstract. The vegetation signal measured from the integrated Earth re-
flectance spectrum derived from Moon Earthshine observations is compared
with data from Earth-observing POLDER-1 satellite. The vegetation signal
24-h variation is computed from POLDER data for different Earth phases
and observer positions (equator, pole).
1 Introduction
In June 2001, two groups obtained low resolution visible spectra of the Moon
Earthshine (Arnold et al. 2002, Woolf et al. 2002) and extracted the integrated
reflectance spectrum of the Earth. They both detected an increase ( 0 to 10%)
of reflectance around 700nm attributed to the Earth green vegetation which re-
flectance significantly increases in the near infrared, after 700nm (the so-called
Vegetation Red Edge, or VRE). The conclusion of these works is that vegetation,
i.e. life, could be detected in a low resolution spectrum of an unresolved Earth.

  

Source: Arnold, Luc - Observatoire de Haute-Provence

 

Collections: Physics