AustralieFrV1, PascalFrancis, Curation, bibRecord, 004E57

Attributing the impacts of land-cover changes in temperate regions on surface temperature and heat fluxes to specific causes: Results from the first LUCID set of simulations

Identifieur interne : 004E57 ( PascalFrancis/Curation ); précédent : 004E56; suivant : 004E58

Attributing the impacts of land-cover changes in temperate regions on surface temperature and heat fluxes to specific causes: Results from the first LUCID set of simulations

Auteurs : J. P. Boisier [France] ; N. De Noblet-Ducoudre [France] ; A. J. Pitman [Australie] ; F. T. Cruz [Australie, Philippines] ; C. Delire [France] ; B. J. J. M. Van Den Hurk [Pays-Bas] ; M. K. Van Der Molen [Pays-Bas] ; C. Miiller [Allemagne] ; A. Voldoire [France]

Source :

Journal of geophysical research [ 0148-0227 ] ; 2012.

RBID : Pascal:12-0355061

Descripteurs français

Pascal (Inist)
- Occupation sol, Zone tempérée, Température surface, Température superficielle, Flux chaleur, Transfert chaleur, Simulation, Refroidissement, Utilisation terrain, Modèle climat, Rayonnement solaire, Amplitude, Energie turbulence, Transfert énergie, Albedo, Evapotranspiration, Efficacité, Rugosité, Réchauffement, Climat, Incertitude, Chaleur latente, Analyse statistique, Analyse sensibilité, Narrows.
Wicri :
- topic : Zone tempérée, Simulation, Climat.

English descriptors

KwdEn :
- Climate models, Narrows, Surface temperature, Turbulence energy, albedo, amplitude, climate, cooling, efficiency, energy transfer, evapotranspiration, heat flux, heat transfer, land cover, land use, latent heat, roughness, sensitivity analysis, simulation, solar radiation, statistical analysis, surface temperature, temperate zone, uncertainties, warming.

Abstract

[1] Surface cooling in temperate regions is a common biogeophysical response to historical Land-Use induced Land Cover Change (LULCC). The climate models involved in LUCID show, however, significant differences in the magnitude and the seasonal partitioning of the temperature change. The LULCC-induced cooling is directed by decreases in absorbed solar radiation, but its amplitude is 30 to 50% smaller than the one that would be expected from the sole radiative changes. This results from direct impacts on the total turbulent energy flux (related to changes in land-cover properties other than albedo, such as evapotranspiration efficiency or surface roughness) that decreases at all seasons, and thereby induces a relative warming in all models. The magnitude of those processes varies significantly from model to model, resulting on different climate responses to LULCC. To address this uncertainty, we analyzed the LULCC impacts on surface albedo, latent heat and total turbulent energy flux, using a multivariate statistical analysis to mimic the models' responses. The differences are explained by two major 'features' varying from one model to another: the land-cover distribution and the simulated sensitivity to LULCC. The latter explains more than half of the inter-model spread and resides in how the land-surface functioning is parameterized, in particular regarding the evapotranspiration partitioning within the different land-cover types, as well as the role of leaf area index in the flux calculations. This uncertainty has to be narrowed through a more rigorous evaluation of our land-surface models.

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C01	`01`		`ENG`	@0 [1] Surface cooling in temperate regions is a common biogeophysical response to historical Land-Use induced Land Cover Change (LULCC). The climate models involved in LUCID show, however, significant differences in the magnitude and the seasonal partitioning of the temperature change. The LULCC-induced cooling is directed by decreases in absorbed solar radiation, but its amplitude is 30 to 50% smaller than the one that would be expected from the sole radiative changes. This results from direct impacts on the total turbulent energy flux (related to changes in land-cover properties other than albedo, such as evapotranspiration efficiency or surface roughness) that decreases at all seasons, and thereby induces a relative warming in all models. The magnitude of those processes varies significantly from model to model, resulting on different climate responses to LULCC. To address this uncertainty, we analyzed the LULCC impacts on surface albedo, latent heat and total turbulent energy flux, using a multivariate statistical analysis to mimic the models' responses. The differences are explained by two major 'features' varying from one model to another: the land-cover distribution and the simulated sensitivity to LULCC. The latter explains more than half of the inter-model spread and resides in how the land-surface functioning is parameterized, in particular regarding the evapotranspiration partitioning within the different land-cover types, as well as the role of leaf area index in the flux calculations. This uncertainty has to be narrowed through a more rigorous evaluation of our land-surface models.
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Pascal:12-0355061

Le document en format XML

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<author><name sortKey="Voldoire, A" sort="Voldoire, A" uniqKey="Voldoire A" first="A." last="Voldoire">A. Voldoire</name>
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<series><title level="j" type="main">Journal of geophysical research</title>
<title level="j" type="abbreviated">J. geophys. res.</title>
<idno type="ISSN">0148-0227</idno>
<imprint><date when="2012">2012</date>
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<idno type="ISSN">0148-0227</idno>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Climate models</term>
<term>Narrows</term>
<term>Surface temperature</term>
<term>Turbulence energy</term>
<term>albedo</term>
<term>amplitude</term>
<term>climate</term>
<term>cooling</term>
<term>efficiency</term>
<term>energy transfer</term>
<term>evapotranspiration</term>
<term>heat flux</term>
<term>heat transfer</term>
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<term>solar radiation</term>
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<term>Refroidissement</term>
<term>Utilisation terrain</term>
<term>Modèle climat</term>
<term>Rayonnement solaire</term>
<term>Amplitude</term>
<term>Energie turbulence</term>
<term>Transfert énergie</term>
<term>Albedo</term>
<term>Evapotranspiration</term>
<term>Efficacité</term>
<term>Rugosité</term>
<term>Réchauffement</term>
<term>Climat</term>
<term>Incertitude</term>
<term>Chaleur latente</term>
<term>Analyse statistique</term>
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<front><div type="abstract" xml:lang="en">[1] Surface cooling in temperate regions is a common biogeophysical response to historical Land-Use induced Land Cover Change (LULCC). The climate models involved in LUCID show, however, significant differences in the magnitude and the seasonal partitioning of the temperature change. The LULCC-induced cooling is directed by decreases in absorbed solar radiation, but its amplitude is 30 to 50% smaller than the one that would be expected from the sole radiative changes. This results from direct impacts on the total turbulent energy flux (related to changes in land-cover properties other than albedo, such as evapotranspiration efficiency or surface roughness) that decreases at all seasons, and thereby induces a relative warming in all models. The magnitude of those processes varies significantly from model to model, resulting on different climate responses to LULCC. To address this uncertainty, we analyzed the LULCC impacts on surface albedo, latent heat and total turbulent energy flux, using a multivariate statistical analysis to mimic the models' responses. The differences are explained by two major 'features' varying from one model to another: the land-cover distribution and the simulated sensitivity to LULCC. The latter explains more than half of the inter-model spread and resides in how the land-surface functioning is parameterized, in particular regarding the evapotranspiration partitioning within the different land-cover types, as well as the role of leaf area index in the flux calculations. This uncertainty has to be narrowed through a more rigorous evaluation of our land-surface models.</div>
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<s3>FRA</s3>
<sZ>5 aut.</sZ>
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<fC01 i1="01" l="ENG"><s0>[1] Surface cooling in temperate regions is a common biogeophysical response to historical Land-Use induced Land Cover Change (LULCC). The climate models involved in LUCID show, however, significant differences in the magnitude and the seasonal partitioning of the temperature change. The LULCC-induced cooling is directed by decreases in absorbed solar radiation, but its amplitude is 30 to 50% smaller than the one that would be expected from the sole radiative changes. This results from direct impacts on the total turbulent energy flux (related to changes in land-cover properties other than albedo, such as evapotranspiration efficiency or surface roughness) that decreases at all seasons, and thereby induces a relative warming in all models. The magnitude of those processes varies significantly from model to model, resulting on different climate responses to LULCC. To address this uncertainty, we analyzed the LULCC impacts on surface albedo, latent heat and total turbulent energy flux, using a multivariate statistical analysis to mimic the models' responses. The differences are explained by two major 'features' varying from one model to another: the land-cover distribution and the simulated sensitivity to LULCC. The latter explains more than half of the inter-model spread and resides in how the land-surface functioning is parameterized, in particular regarding the evapotranspiration partitioning within the different land-cover types, as well as the role of leaf area index in the flux calculations. This uncertainty has to be narrowed through a more rigorous evaluation of our land-surface models.</s0>
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<fC02 i1="01" i2="3"><s0>001E</s0>
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<fC02 i1="02" i2="2"><s0>001E01</s0>
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<fC02 i1="03" i2="2"><s0>220</s0>
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<s5>04</s5>
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<s5>04</s5>
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<s5>05</s5>
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<s5>05</s5>
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<s5>05</s5>
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<fC03 i1="06" i2="2" l="FRE"><s0>Transfert chaleur</s0>
<s5>06</s5>
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<fC03 i1="06" i2="2" l="ENG"><s0>heat transfer</s0>
<s5>06</s5>
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<s5>08</s5>
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<s5>08</s5>
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<s5>09</s5>
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<s5>09</s5>
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<s5>10</s5>
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<s5>10</s5>
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<s5>11</s5>
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<s5>11</s5>
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<fC03 i1="12" i2="2" l="FRE"><s0>Amplitude</s0>
<s5>12</s5>
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<s5>12</s5>
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<s5>12</s5>
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<s5>14</s5>
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<s5>18</s5>
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<s5>19</s5>
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<s5>19</s5>
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<s5>19</s5>
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<s5>22</s5>
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<s5>23</s5>
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<s5>23</s5>
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<s5>24</s5>
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<s5>24</s5>
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<s5>25</s5>
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<s5>25</s5>
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<s5>61</s5>
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Attributing the impacts of land-cover changes in temperate regions on surface temperature and heat fluxes to specific causes: Results from the first LUCID set of simulations

Attributing the impacts of land-cover changes in temperate regions on surface temperature and heat fluxes to specific causes: Results from the first LUCID set of simulations

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