the improvement of soil thermodynamics and its effects on land surface meteorology in the ipsl climate model
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2016
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Abstract
This paper describes the implementation of an improved soil thermodynamics in
the hydrological module of Earth system model (ESM) developed at the Institut
Pierre Simon Laplace (IPSL) and its effects on land surface meteorology in
the IPSL climate model. A common vertical discretization scheme for the soil
moisture and for the soil temperature is adopted. In addition to the heat
conduction process, the heat transported by liquid water into the soil is
modeled. The thermal conductivity and the heat capacity are parameterized as
a function of the soil moisture and the texture. Preliminary tests are
performed in an idealized 1-D (one-dimensional) framework and the full model is then evaluated
in the coupled land–atmospheric module of the IPSL ESM. A nudging approach is
used in order to avoid the time-consuming long-term simulations required to
account for the natural variability of the climate. Thanks to this nudging
approach, the effects of the modified parameterizations can be modeled. The
dependence of the soil thermal properties on moisture and texture lead to the
most significant changes in the surface energy budget and in the surface
temperature, with the strongest effects on the surface energy budget taking
place over dry areas and during the night. This has important consequences on
the mean surface temperature over dry areas and during the night and on its
short-term variability. The parameterization of the soil thermal properties
could therefore explain some of the temperature biases and part of the
dispersion over dry areas in simulations of extreme events such as heat waves
in state-of-the-art climate models.
| Reference Key |
wang2016geoscientificthe
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|---|---|
| Authors | ;F. Wang;F. Cheruy;J.-L. Dufresne |
| Journal | international journal of quantum chemistry |
| Year | 2016 |
| DOI |
10.5194/gmd-9-363-2016
|
| URL | |
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