Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands
<p>EvapoTranspiration (ET) is an important component of the water cycle, especially in semi-arid lands. Its quantification is crucial for a sustainable management of scarce water resources. A way to quantify ET is to exploit the available surface temperature data from remote sensing as a signa...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2018-12-01
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| Series: | Proceedings of the International Association of Hydrological Sciences |
| Online Access: | https://www.proc-iahs.net/380/17/2018/piahs-380-17-2018.pdf |
| _version_ | 1819012418444984320 |
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| author | G. Boulet E. Delogu S. Saadi S. Saadi W. Chebbi W. Chebbi A. Olioso B. Mougenot P. Fanise Z. Lili-Chabaane J.-P. Lagouarde |
| author_facet | G. Boulet E. Delogu S. Saadi S. Saadi W. Chebbi W. Chebbi A. Olioso B. Mougenot P. Fanise Z. Lili-Chabaane J.-P. Lagouarde |
| author_sort | G. Boulet |
| collection | DOAJ |
| description | <p>EvapoTranspiration (ET) is an important component of the water cycle,
especially in semi-arid lands. Its quantification is crucial for a
sustainable management of scarce water resources. A way to quantify ET is to
exploit the available surface temperature data from remote sensing as a
signature of the surface energy balance, including the latent heat flux.
Remotely sensed energy balance models enable to estimate stress levels and,
in turn, the water status of most continental surfaces. The evaporation and
transpiration components of ET are also just as important in agricultural
water management and ecosystem health monitoring. Single temperatures can be
used with dual source energy balance models but rely on specific assumptions
on raw levels of plant water stress to get both components out of a single
source of information. Additional information from remote sensing data are
thus required, either something specifically related to evaporation (such as
surface water content) or transpiration (such as PRI or fluorescence). This
works evaluates the SPARSE dual source energy balance model ability to
compute not only total ET, but also water stress and
transpiration/evaporation components. First, the theoretical limits of the ET
component retrieval are assessed through a simulation experiment using both
retrieval and prescribed modes of SPARSE with the sole surface temperature. A
similar work is performed with an additional constraint, the topsoil surface
soil moisture level, showing the significant improvement on the retrieval.
Then, a flux dataset acquired over rainfed wheat is used to check the
robustness of both stress levels and ET retrievals. In particular, retrieval
of the evaporation and transpiration components is assessed in both
conditions (forcing by the sole temperature or the combination of temperature
and soil moisture). In our example, there is no significant difference in the
performance of the total ET retrieval, since the evaporation rate retrieved
from the sole surface temperature is already fairly close to the one we can
reconstruct from observed surface soil moisture time series, but current work
is underway to test it over other plots.</p> |
| first_indexed | 2024-12-21T01:43:44Z |
| format | Article |
| id | doaj.art-ad9dde7cd8e146f9b614633e1595593d |
| institution | Directory Open Access Journal |
| issn | 2199-8981 2199-899X |
| language | English |
| last_indexed | 2024-12-21T01:43:44Z |
| publishDate | 2018-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Proceedings of the International Association of Hydrological Sciences |
| spelling | doaj.art-ad9dde7cd8e146f9b614633e1595593d2022-12-21T19:20:05ZengCopernicus PublicationsProceedings of the International Association of Hydrological Sciences2199-89812199-899X2018-12-01380172210.5194/piahs-380-17-2018Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural landsG. Boulet0E. Delogu1S. Saadi2S. Saadi3W. Chebbi4W. Chebbi5A. Olioso6B. Mougenot7P. Fanise8Z. Lili-Chabaane9J.-P. Lagouarde10CESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceCESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceCESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceUniversité de Carthage/Institut National Agronomique de Tunisie, Tunis, TunisieCESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceUniversité de Carthage/Institut National Agronomique de Tunisie, Tunis, TunisieEMMAH, INRA, Université d'Avignon et des Pays de Vaucluse, Avignon, FranceCESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceCESBIO, Université de Toulouse, CNES/CNRS/IRD/UPS, Toulouse, FranceUniversité de Carthage/Institut National Agronomique de Tunisie, Tunis, TunisieISPA, INRA, Bordeaux Sciences Agro, Villenave d'Ornon, France<p>EvapoTranspiration (ET) is an important component of the water cycle, especially in semi-arid lands. Its quantification is crucial for a sustainable management of scarce water resources. A way to quantify ET is to exploit the available surface temperature data from remote sensing as a signature of the surface energy balance, including the latent heat flux. Remotely sensed energy balance models enable to estimate stress levels and, in turn, the water status of most continental surfaces. The evaporation and transpiration components of ET are also just as important in agricultural water management and ecosystem health monitoring. Single temperatures can be used with dual source energy balance models but rely on specific assumptions on raw levels of plant water stress to get both components out of a single source of information. Additional information from remote sensing data are thus required, either something specifically related to evaporation (such as surface water content) or transpiration (such as PRI or fluorescence). This works evaluates the SPARSE dual source energy balance model ability to compute not only total ET, but also water stress and transpiration/evaporation components. First, the theoretical limits of the ET component retrieval are assessed through a simulation experiment using both retrieval and prescribed modes of SPARSE with the sole surface temperature. A similar work is performed with an additional constraint, the topsoil surface soil moisture level, showing the significant improvement on the retrieval. Then, a flux dataset acquired over rainfed wheat is used to check the robustness of both stress levels and ET retrievals. In particular, retrieval of the evaporation and transpiration components is assessed in both conditions (forcing by the sole temperature or the combination of temperature and soil moisture). In our example, there is no significant difference in the performance of the total ET retrieval, since the evaporation rate retrieved from the sole surface temperature is already fairly close to the one we can reconstruct from observed surface soil moisture time series, but current work is underway to test it over other plots.</p>https://www.proc-iahs.net/380/17/2018/piahs-380-17-2018.pdf |
| spellingShingle | G. Boulet E. Delogu S. Saadi S. Saadi W. Chebbi W. Chebbi A. Olioso B. Mougenot P. Fanise Z. Lili-Chabaane J.-P. Lagouarde Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands Proceedings of the International Association of Hydrological Sciences |
| title | Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands |
| title_full | Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands |
| title_fullStr | Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands |
| title_full_unstemmed | Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands |
| title_short | Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands |
| title_sort | evapotranspiration and evaporation transpiration partitioning with dual source energy balance models in agricultural lands |
| url | https://www.proc-iahs.net/380/17/2018/piahs-380-17-2018.pdf |
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