The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites
Land surface models (LSMs) need to balance a complicated trade-off between computational cost and complexity in order to adequately represent the exchanges of energy, water and matter with the atmosphere and the ocean. Some current generation LSMs use a simplified or composite canopy approach that g...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2017-04-01
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| Series: | Geoscientific Model Development |
| Online Access: | http://www.geosci-model-dev.net/10/1621/2017/gmd-10-1621-2017.pdf |
| _version_ | 1818449055426019328 |
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| author | A. Napoly A. Boone P. Samuelsson S. Gollvik E. Martin R. Seferian D. Carrer B. Decharme L. Jarlan |
| author_facet | A. Napoly A. Boone P. Samuelsson S. Gollvik E. Martin R. Seferian D. Carrer B. Decharme L. Jarlan |
| author_sort | A. Napoly |
| collection | DOAJ |
| description | Land surface models (LSMs) need to balance a complicated trade-off between
computational cost and complexity in order to adequately represent the
exchanges of energy, water and matter with the atmosphere and the ocean. Some
current generation LSMs use a simplified or composite canopy approach that
generates recurrent errors in simulated soil temperature and turbulent
fluxes. In response to these issues, a new version of the interactions
between soil–biosphere–atmosphere (ISBA) land surface model has recently
been developed that explicitly solves the transfer of energy and water from
the upper canopy and the forest floor, which is characterized as a litter
layer. The multi-energy balance (MEB) version of ISBA is first evaluated for
three well-instrumented contrasting local-scale sites, and sensitivity tests
are performed to explore the behavior of new model parameters. Second,
ISBA-MEB is benchmarked against observations from 42 forested sites from the
global micro-meteorological network (FLUXNET) for multiple annual cycles.<br><br>It is shown that ISBA-MEB outperforms the composite version of ISBA in
improving the representation of soil temperature, ground, sensible and, to a
lesser extent, latent heat fluxes. Both versions of ISBA give comparable
results in terms of simulated latent heat flux because of the similar
formulations of the water uptake and the stomatal resistance. However, MEB
produces a better agreement with the observations of sensible heat flux than
the previous version of ISBA for 87.5 % of the simulated years across the
42 forested FLUXNET sites. Most of this improvement arises owing to the
improved simulation of the ground conduction flux, which is greatly improved
using MEB, especially owing to the forest litter parameterization. It is also
shown that certain processes are also modeled more realistically (such as the
partitioning of evapotranspiration into transpiration and ground
evaporation), even if certain statistical performances are neutral. The
analyses demonstrate that the shading effect of the vegetation, the explicit
treatment of turbulent transfer for the canopy and ground, and the insulating
thermal and hydrological effects of the forest floor litter turn out to be
essential for simulating the exchange of energy, water and matter across a
large range of forest types and climates. |
| first_indexed | 2024-12-14T20:29:19Z |
| format | Article |
| id | doaj.art-da08a67ff94143b2aab0d3eb89e0aa82 |
| institution | Directory Open Access Journal |
| issn | 1991-959X 1991-9603 |
| language | English |
| last_indexed | 2024-12-14T20:29:19Z |
| publishDate | 2017-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Geoscientific Model Development |
| spelling | doaj.art-da08a67ff94143b2aab0d3eb89e0aa822022-12-21T22:48:33ZengCopernicus PublicationsGeoscientific Model Development1991-959X1991-96032017-04-011041621164410.5194/gmd-10-1621-2017The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sitesA. Napoly0A. Boone1P. Samuelsson2S. Gollvik3E. Martin4R. Seferian5D. Carrer6B. Decharme7L. Jarlan8CNRM UMR 3589, Météo-France/CNRS, Toulouse, FranceCNRM UMR 3589, Météo-France/CNRS, Toulouse, FranceSwedish Meteorological and Hydrological Institute, Norrköping, SwedenSwedish Meteorological and Hydrological Institute, Norrköping, SwedenIRSTEA, U-R RECOVER, Aix en Provence, FranceCNRM UMR 3589, Météo-France/CNRS, Toulouse, FranceCNRM UMR 3589, Météo-France/CNRS, Toulouse, FranceCNRM UMR 3589, Météo-France/CNRS, Toulouse, FranceCentre d'études Spatiales de la Biosphère (CESBIO), Toulouse, FranceLand surface models (LSMs) need to balance a complicated trade-off between computational cost and complexity in order to adequately represent the exchanges of energy, water and matter with the atmosphere and the ocean. Some current generation LSMs use a simplified or composite canopy approach that generates recurrent errors in simulated soil temperature and turbulent fluxes. In response to these issues, a new version of the interactions between soil–biosphere–atmosphere (ISBA) land surface model has recently been developed that explicitly solves the transfer of energy and water from the upper canopy and the forest floor, which is characterized as a litter layer. The multi-energy balance (MEB) version of ISBA is first evaluated for three well-instrumented contrasting local-scale sites, and sensitivity tests are performed to explore the behavior of new model parameters. Second, ISBA-MEB is benchmarked against observations from 42 forested sites from the global micro-meteorological network (FLUXNET) for multiple annual cycles.<br><br>It is shown that ISBA-MEB outperforms the composite version of ISBA in improving the representation of soil temperature, ground, sensible and, to a lesser extent, latent heat fluxes. Both versions of ISBA give comparable results in terms of simulated latent heat flux because of the similar formulations of the water uptake and the stomatal resistance. However, MEB produces a better agreement with the observations of sensible heat flux than the previous version of ISBA for 87.5 % of the simulated years across the 42 forested FLUXNET sites. Most of this improvement arises owing to the improved simulation of the ground conduction flux, which is greatly improved using MEB, especially owing to the forest litter parameterization. It is also shown that certain processes are also modeled more realistically (such as the partitioning of evapotranspiration into transpiration and ground evaporation), even if certain statistical performances are neutral. The analyses demonstrate that the shading effect of the vegetation, the explicit treatment of turbulent transfer for the canopy and ground, and the insulating thermal and hydrological effects of the forest floor litter turn out to be essential for simulating the exchange of energy, water and matter across a large range of forest types and climates.http://www.geosci-model-dev.net/10/1621/2017/gmd-10-1621-2017.pdf |
| spellingShingle | A. Napoly A. Boone P. Samuelsson S. Gollvik E. Martin R. Seferian D. Carrer B. Decharme L. Jarlan The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites Geoscientific Model Development |
| title | The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites |
| title_full | The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites |
| title_fullStr | The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites |
| title_full_unstemmed | The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites |
| title_short | The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites |
| title_sort | interactions between soil biosphere atmosphere isba land surface model multi energy balance meb option in surfexv8 part 2 introduction of a litter formulation and model evaluation for local scale forest sites |
| url | http://www.geosci-model-dev.net/10/1621/2017/gmd-10-1621-2017.pdf |
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