Bibcode
García Munõz, A.; Pallé, E.; Sanromá, E.
Referencia bibliográfica
The Astrophysical Journal, Volume 766, Issue 2, article id. 133, 8 pp. (2013).
Fecha de publicación:
4
2013
Revista
Número de citas
17
Número de citas referidas
16
Descripción
Understanding the spectral and photometric variability of the Earth and
the rest of the solar system planets has become of utmost importance for
the future characterization of rocky exoplanets. As this is not only
interesting at present times but also along the planetary evolution, we
studied the effect that the evolution of microbial mats and plants over
land has had on the way our planet looks from afar. As life evolved,
continental surfaces changed gradually and non-uniformly from deserts
through microbial mats to land plants, modifying the reflective
properties of the ground and most likely the distribution of moisture
and cloudiness. Here, we used a radiative transfer model of the Earth,
together with geological paleo-records of the continental distribution
and a reconstructed cloud distribution, to simulate the visible and
near-IR radiation reflected by our planet as a function of Earth's
rotation. We found that the evolution from deserts to microbial mats and
to land plants produces detectable changes in the globally averaged
Earth's reflectance. The variability of each surface type is located in
different bands and can induce reflectance changes of up to 40% in
period of hours. We conclude that by using photometric observations of
an Earth-like planet at different photometric bands it would be possible
to discriminate between different surface types. While recent literature
proposes the red-edge feature of vegetation near 0.7 μm as a
signature for land plants, observations in near-IR bands can be equally
or even better suited for this purpose.
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Enric
Pallé Bago