Climate of the Past Discussions
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2008-01-21
Borehole climatology: a discussion based on contributions from climate modeling
J. F. González-Rouco
fidelgr@fis.ucm.es
H. Beltrami
E. Zorita
M. B. Stevens
Departamento Astrofísica y CC. de la Atmósfera, Universidad Complutense, Madrid, Spain
Environmental Sciences Research Centre, St. Francis Xavier Univ., Nova Scotia, Canada
GKSS Research Centre, Geesthacht, Germany
Progress in understanding climate variability through the last millennium
leans on simulation and reconstruction efforts. Exercises blending
both approaches present a great potential for answering questions
relevant both for the simulation and reconstruction of past climate,
and depend on the specific peculiarities of proxies and methods
involved in climate reconstructions, as well as on the realism and
limitations of model simulations. This paper explores
research specifically related to paleoclimate modeling and borehole
climatology as a branch of climate reconstruction that has contributed
significantly to our knowledge of the low frequency climate evolution
during the last five centuries.
<br><br>
The text flows around three main issues that group most of the
interaction between model and geothermal efforts: the use of models as
a validation tool for borehole climate reconstructions; comparison of
geothermal information and model simulations as a means of either
model validation or inference about past climate; and
implications of the degree of realism on simulating subsurface
climate on estimations of future climate change.
<br><br>
The use of multi-centennial simulations as a surrogate reality for
past climate suggests that within the simplified reality of climate
models, methods and assumptions in borehole reconstructions deliver a
consistent picture of past climate evolution at long time scales.
Comparison of model simulations and borehole profiles indicate that
borehole temperatures are responding to past external forcing and that
more realism in the development of the soil model components in
climate models is desirable. Such an improved degree of realism is
important for the simulation of subsurface climate and air-ground
interaction; results indicate it could also be crucial for simulating
the adequate energy balance within climate change scenario
experiments.
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