the interactions between soil–biosphere–atmosphere land surface model with a multi-energy balance (isba-meb) option in surfexv8 – part 1: model description
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2017
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Abstract
Land surface models (LSMs) are pushing towards improved realism owing to an
increasing number of observations at the local scale, constantly improving
satellite data sets and the associated methodologies to best exploit such
data, improved computing resources, and in response to the user community. As
a part of the trend in LSM development, there have been ongoing efforts to
improve the representation of the land surface processes in the interactions between
the soil–biosphere–atmosphere (ISBA) LSM within the EXternalized
SURFace (SURFEX) model platform. The force–restore approach in ISBA has been
replaced in recent years by multi-layer explicit physically based options for
sub-surface heat transfer, soil hydrological processes, and the composite
snowpack. The representation of vegetation processes in SURFEX has also
become much more sophisticated in recent years, including photosynthesis and
respiration and biochemical processes. It became clear that the conceptual
limits of the composite soil–vegetation scheme within ISBA had been reached
and there was a need to explicitly separate the canopy vegetation from the
soil surface. In response to this issue, a collaboration began in 2008
between the high-resolution limited area model (HIRLAM) consortium and
Météo-France with the intention to develop an explicit representation of
the vegetation in ISBA under the SURFEX platform. A new parameterization has
been developed called the ISBA multi-energy balance (MEB) in order to address
these issues. ISBA-MEB consists in a fully implicit numerical coupling
between a multi-layer physically based snowpack model, a variable-layer soil
scheme, an explicit litter layer, a bulk vegetation scheme, and the
atmosphere. It also includes a feature that permits a coupling transition of
the snowpack from the canopy air to the free atmosphere. It shares many of
the routines and physics parameterizations with the standard version of ISBA.
This paper is the first of two parts; in part one, the ISBA-MEB model equations, numerical schemes, and
theoretical background are presented. In part two (Napoly et
al., 2016), which is a separate
companion paper, a local scale evaluation of the new scheme is presented
along with a detailed description of the new forest litter scheme.
| Reference Key |
boone2017geoscientificthe
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|---|---|
| Authors | ;A. Boone;P. Samuelsson;S. Gollvik;A. Napoly;L. Jarlan;E. Brun;B. Decharme |
| Journal | international journal of quantum chemistry |
| Year | 2017 |
| DOI |
10.5194/gmd-10-843-2017
|
| URL | |
| Keywords |
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