Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties
Evapotranspiration has been recognized as one of the most uncertain terms in the surface water balance simulated by land surface models. In this study, the SURFEX/ISBA-A-gs (Interaction Sol–Biosphere–Atmosphere) simulations of evapotranspiration are assessed at the field scale over a 12-year Mediter...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-07-01
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| Series: | Hydrology and Earth System Sciences |
| Online Access: | http://www.hydrol-earth-syst-sci.net/19/3109/2015/hess-19-3109-2015.pdf |
| _version_ | 1818910575031222272 |
|---|---|
| author | S. Garrigues A. Olioso J. C. Calvet E. Martin S. Lafont S. Moulin A. Chanzy O. Marloie S. Buis V. Desfonds N. Bertrand D. Renard |
| author_facet | S. Garrigues A. Olioso J. C. Calvet E. Martin S. Lafont S. Moulin A. Chanzy O. Marloie S. Buis V. Desfonds N. Bertrand D. Renard |
| author_sort | S. Garrigues |
| collection | DOAJ |
| description | Evapotranspiration has been recognized as one of the most uncertain terms in
the surface water balance simulated by land surface models. In this study,
the SURFEX/ISBA-A-gs (Interaction Sol–Biosphere–Atmosphere) simulations of evapotranspiration are assessed at the
field scale over a 12-year Mediterranean crop succession. The model is
evaluated in its standard implementation which relies on the use of the ISBA
pedotransfer estimates of the soil properties. The originality of this work
consists in explicitly representing the succession of crop cycles and
inter-crop bare soil periods in the simulations and assessing its impact on
the dynamics of simulated and measured evapotranspiration over a long period
of time. The analysis focuses on key parameters which drive the simulation
of ET, namely the rooting depth, the soil moisture at saturation, the soil
moisture at field capacity and the soil moisture at wilting point. A
sensitivity analysis is first conducted to quantify the relative
contribution of each parameter on ET simulation over 12 years. The impact of
the estimation method used to retrieve the soil parameters (pedotransfer
function, laboratory and field methods) on ET is then analysed. The benefit
of representing the variations in time of the rooting depth and wilting
point is evaluated. Finally, the propagation of uncertainties in the soil
parameters on ET simulations is quantified through a Monte Carlo analysis
and compared with the uncertainties triggered by the mesophyll conductance
which is a key above-ground driver of the stomatal conductance.
<br><br>
This work shows that evapotranspiration mainly results from the soil
evaporation when it is continuously simulated over a Mediterranean crop
succession. This results in a high sensitivity of simulated
evapotranspiration to uncertainties in the soil moisture at field capacity
and the soil moisture at saturation, both of which drive the simulation of soil
evaporation. Field capacity was proved to be the most influencing parameter
on the simulation of evapotranspiration over the crop succession. The
evapotranspiration simulated with the standard surface and soil parameters
of the model is largely underestimated. The deficit in cumulative
evapotranspiration amounts to 24 % over 12 years. The bias in daily
daytime evapotranspiration is −0.24 mm day<sup>−1</sup>. The ISBA pedotransfer
estimates of the soil moisture at saturation and at wilting point are
overestimated, which explains most of the evapotranspiration underestimation.
The use of field capacity values retrieved from laboratory methods leads to
inaccurate simulation of ET due to the lack of representativeness of the
soil structure variability at the field scale. The most accurate simulation
is achieved with the average values of the soil properties derived from the
analysis of field measurements of soil moisture vertical profiles over each
crop cycle. The representation of the variations in time of the wilting
point and the maximum rooting depth over the crop succession has little
impact on the simulation performances. Finally, we show that the
uncertainties in the soil parameters can generate substantial uncertainties
in ET simulated over 12 years (the 95 % confidence interval represents
23 % of cumulative ET over 12 years). Uncertainties in the mesophyll
conductance have lower impact on ET. Measurement random errors explain a
large part of the scattering between simulations and measurements at
half-hourly timescale. The deficits in simulated ET reported in this work
are probably larger due to likely underestimation of ET by eddy-covariance
measurements. Other possible model shortcomings include the lack of
representation of soil vertical heterogeneity and root profile along with
inaccurate energy balance partitioning between the soil and the vegetation
at low leaf area index. |
| first_indexed | 2024-12-19T22:44:59Z |
| format | Article |
| id | doaj.art-c0776ac88350482a86a8a8054a97fd09 |
| institution | Directory Open Access Journal |
| issn | 1027-5606 1607-7938 |
| language | English |
| last_indexed | 2024-12-19T22:44:59Z |
| publishDate | 2015-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Hydrology and Earth System Sciences |
| spelling | doaj.art-c0776ac88350482a86a8a8054a97fd092022-12-21T20:02:58ZengCopernicus PublicationsHydrology and Earth System Sciences1027-56061607-79382015-07-011973109313110.5194/hess-19-3109-2015Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation propertiesS. Garrigues0A. Olioso1J. C. Calvet2E. Martin3S. Lafont4S. Moulin5A. Chanzy6O. Marloie7S. Buis8V. Desfonds9N. Bertrand10D. Renard11EMMAH (UMR1114), INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceCNRM-GAME (UMR3589), Météo-France, CNRS, Toulouse, FranceCNRM-GAME (UMR3589), Météo-France, CNRS, Toulouse, FranceISPA, INRA, Bordeaux, FranceEMMAH (UMR1114), INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceURFM, INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceEMMAH (UMR1114), INRA, Avignon, FranceEvapotranspiration has been recognized as one of the most uncertain terms in the surface water balance simulated by land surface models. In this study, the SURFEX/ISBA-A-gs (Interaction Sol–Biosphere–Atmosphere) simulations of evapotranspiration are assessed at the field scale over a 12-year Mediterranean crop succession. The model is evaluated in its standard implementation which relies on the use of the ISBA pedotransfer estimates of the soil properties. The originality of this work consists in explicitly representing the succession of crop cycles and inter-crop bare soil periods in the simulations and assessing its impact on the dynamics of simulated and measured evapotranspiration over a long period of time. The analysis focuses on key parameters which drive the simulation of ET, namely the rooting depth, the soil moisture at saturation, the soil moisture at field capacity and the soil moisture at wilting point. A sensitivity analysis is first conducted to quantify the relative contribution of each parameter on ET simulation over 12 years. The impact of the estimation method used to retrieve the soil parameters (pedotransfer function, laboratory and field methods) on ET is then analysed. The benefit of representing the variations in time of the rooting depth and wilting point is evaluated. Finally, the propagation of uncertainties in the soil parameters on ET simulations is quantified through a Monte Carlo analysis and compared with the uncertainties triggered by the mesophyll conductance which is a key above-ground driver of the stomatal conductance. <br><br> This work shows that evapotranspiration mainly results from the soil evaporation when it is continuously simulated over a Mediterranean crop succession. This results in a high sensitivity of simulated evapotranspiration to uncertainties in the soil moisture at field capacity and the soil moisture at saturation, both of which drive the simulation of soil evaporation. Field capacity was proved to be the most influencing parameter on the simulation of evapotranspiration over the crop succession. The evapotranspiration simulated with the standard surface and soil parameters of the model is largely underestimated. The deficit in cumulative evapotranspiration amounts to 24 % over 12 years. The bias in daily daytime evapotranspiration is −0.24 mm day<sup>−1</sup>. The ISBA pedotransfer estimates of the soil moisture at saturation and at wilting point are overestimated, which explains most of the evapotranspiration underestimation. The use of field capacity values retrieved from laboratory methods leads to inaccurate simulation of ET due to the lack of representativeness of the soil structure variability at the field scale. The most accurate simulation is achieved with the average values of the soil properties derived from the analysis of field measurements of soil moisture vertical profiles over each crop cycle. The representation of the variations in time of the wilting point and the maximum rooting depth over the crop succession has little impact on the simulation performances. Finally, we show that the uncertainties in the soil parameters can generate substantial uncertainties in ET simulated over 12 years (the 95 % confidence interval represents 23 % of cumulative ET over 12 years). Uncertainties in the mesophyll conductance have lower impact on ET. Measurement random errors explain a large part of the scattering between simulations and measurements at half-hourly timescale. The deficits in simulated ET reported in this work are probably larger due to likely underestimation of ET by eddy-covariance measurements. Other possible model shortcomings include the lack of representation of soil vertical heterogeneity and root profile along with inaccurate energy balance partitioning between the soil and the vegetation at low leaf area index.http://www.hydrol-earth-syst-sci.net/19/3109/2015/hess-19-3109-2015.pdf |
| spellingShingle | S. Garrigues A. Olioso J. C. Calvet E. Martin S. Lafont S. Moulin A. Chanzy O. Marloie S. Buis V. Desfonds N. Bertrand D. Renard Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties Hydrology and Earth System Sciences |
| title | Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties |
| title_full | Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties |
| title_fullStr | Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties |
| title_full_unstemmed | Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties |
| title_short | Evaluation of land surface model simulations of evapotranspiration over a 12-year crop succession: impact of soil hydraulic and vegetation properties |
| title_sort | evaluation of land surface model simulations of evapotranspiration over a 12 year crop succession impact of soil hydraulic and vegetation properties |
| url | http://www.hydrol-earth-syst-sci.net/19/3109/2015/hess-19-3109-2015.pdf |
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