Status Report

A climatic thermostat making Earth habitable

By SpaceRef Editor
June 14, 2005
Filed under , ,
A climatic thermostat making Earth habitable

Astrophysics, abstract

From: Peter D. Ditlevsen [view email]
Date: Thu, 12 May 2005 09:39:35 GMT (222kb)

A climatic thermostat making Earth habitable

Peter D. Ditlevsen

Comments: 4 figures, Proceedings, NORDITA conf. Astrobiology 2004

The mean surface temperature on Earth and other planets with atmospheres is
determined by the radiative balance between the non-reflected incoming solar
radiation and the outgoing long-wave black-body radiation from the atmosphere.
The surface temperature is higher than the black-body temperature due to the
greenhouse warming. Balancing the ice-albedo cooling and the greenhouse warming
gives rise to two stable climate states. A cold climate state with a
completelyice-covered planet, called Snowball Earth, and a warm state similar
to our present climate where greenhouse warming prevents the total glacition.
The warm state has dominated Earth in most of its geological history despite a
30 % fainter young Sun. The warming could have been controlled by a greenhouse
thermostat operating by temperature control of the weathering process depleting
the atmosphere from $CO_2$. This temperature control has permitted life to
evolve as early as the end of the heavy bombartment 4 billion years ago.

Full-text: PostScript, PDF, or Other formats

References and citations for this submission:

SLAC-SPIRES HEP (refers to ,
cited by, arXiv reformatted);

CiteBase (autonomous citation navigation and analysis)

Which authors of this paper are endorsers?

Links to:
/abs (/+), /0505,

SpaceRef staff editor.