Jan Polcher
Biographic Data
| ID | 6822350 |
|---|---|
| NAME | Jan Polcher |
| GIVEN NAMES | Jan |
| FAMILY NAME | Polcher |
| SIGNATURE | POLCHER J |
| AFFILIATIONS | Centre National de la Recherche Scientifique |
| ORCID | 0000-0001-9020-5795 |
| VERIFIED | Yes |
| TOTAL WORKS | 9 |
| TOTAL CITATIONS | 0 |
| AUTHOR COUNT | 9 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2005 |
| LATEST PUBLICATION YEAR | 2024 |
| H-INDEX | 0 |
Climats régionaux et régionalisation du climat
Une très grande variété de climats existe sur la Terre et des méthodes dédiées sont nécessaires pour comprendre leur variabilité et évolution dans un contexte de réchauffement climatique global. Au LMD, sont développées des approches numériques pour étudier les climats régionaux. Il s’agit historiquement du modèle global zoomé LMDZ et plus récemment du modèle régional du système Terre Reg-IPSL. Ces modèles ont permis l’étude de climats de nombreu…
Météo, climat et transition énergétique
Actuellement, la production d’énergie représente environ 35 % des émissions de gaz à effet de serre. Respecter l’accord de Paris nécessite d’avoir d’ici 2100, 90 % d’énergies décarbonées dans la consommation d’énergie primaire. Pour atteindre ces objectifs ambitieux, il est impératif d’électrifier certains usages tels que le chauffage et la mobilité. Cela implique une transformation rapide de la production énergétique actuelle, majoritairement ba…
Du « modèle de circulation générale du LMD » aux ressources en eau
Ce chapitre décrit l’évolution de nos recherches en modélisation du climat. Elles ont été centrées sur le cycle de l’eau et sa composante sur les Terres émergées. Des efforts continus sur la modélisation de ce cycle ont eu pour objectif de simuler de façon de plus en plus performante les échanges entre les surfaces et l’atmosphère. Cela a permis d’étudier les influences de la végétation sur les échanges d’eau (évapotranspiration et précipitations…
Exploring the impacts of climate change on French hydropower generation
Hydropower can play a crucial role in decarbonizing national power mixes, in particular in managing the variability of other renewable energy sources. However, climate change is expected to affect the water resources and could impact hydropower generation. This study explores the potential impacts of climate change on hydropower generation in France and its broader consequences on the national power system. To achieve this, an innovative modeling…
Modeling hydropower operations at the scale of a power grid
Climate change and evolving water management practices may have a profound impact on hydropower generation. While hydrological models have been widely used to assess these effects, they often present some limitations. A major challenge lies in the modeling of release decisions for hydropower reservoirs, which result from intricate trade-offs, involving power sector dispatch, competing water uses and the spatial allocation of power generation with…
Simulating French hydropower operations in a land surface model
Climate change and water management are expected to have significant impacts on river flows. Hydropower production is therefore expected to evolve, while low carbon electricity could become more valuable in the context of the transition towards sustainable societies.Hydrological models have been used to evaluate the potential of hydropower plants based on simulated flows. Some of these studies represent dams and water management. However, dam ope…
Climate change projections using the IPSL-CM5 Earth System Model
We present the global general circulation model IPSL-CM5 developed to study the long-term response of the climate system to natural and anthropogenic forcings as part of the 5th Phase of the Coupled Model Intercomparison Project (CMIP5). This model includes an interactive carbon cycle, a representation of tropospheric and stratospheric chemistry, and a comprehensive representation of aerosols. As it represents the principal dynamical, physical, a…
Future changes in precipitation and impacts on extreme streamflow over Amazonian sub-basins
Because of climate change, much attention is drawn to the Amazon River basin, whose hydrology has already been strongly affected by extreme events during the past 20 years. Hydrological annual extreme variations (i.e. low/high flows) associated with precipitation (and evapotranspiration) changes are investigated over the Amazon River sub-basins using the land surface model ORCHIDEE and a multimodel approach. Climate change scenarios from up to ei…
A dynamic global vegetation model for studies of the coupled atmosphere‐biosphere system
This work presents a new dynamic global vegetation model designed as an extension of an existing surface‐vegetation‐atmosphere transfer scheme which is included in a coupled ocean‐atmosphere general circulation model. The new dynamic global vegetation model simulates the principal processes of the continental biosphere influencing the global carbon cycle (photosynthesis, autotrophic and heterotrophic respiration of plants and in soils, fire, etc.…
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A dynamic global vegetation model for studies of the coupled atmosphere‐biosphere system
This work presents a new dynamic global vegetation model designed as an extension of an existing surface‐vegetation‐atmosphere transfer scheme which is included in a coupled ocean‐atmosphere general circulation model. The new dynamic global vegetation model simulates the principal processes of the continental biosphere influencing the global carbon cycle (photosynthesis, autotrophic and heterotrophic respiration of plants and in soils, fire, etc.…
Climate change projections using the IPSL-CM5 Earth System Model
We present the global general circulation model IPSL-CM5 developed to study the long-term response of the climate system to natural and anthropogenic forcings as part of the 5th Phase of the Coupled Model Intercomparison Project (CMIP5). This model includes an interactive carbon cycle, a representation of tropospheric and stratospheric chemistry, and a comprehensive representation of aerosols. As it represents the principal dynamical, physical, a…
Future changes in precipitation and impacts on extreme streamflow over Amazonian sub-basins
Because of climate change, much attention is drawn to the Amazon River basin, whose hydrology has already been strongly affected by extreme events during the past 20 years. Hydrological annual extreme variations (i.e. low/high flows) associated with precipitation (and evapotranspiration) changes are investigated over the Amazon River sub-basins using the land surface model ORCHIDEE and a multimodel approach. Climate change scenarios from up to ei…
Simulating French hydropower operations in a land surface model
Climate change and water management are expected to have significant impacts on river flows. Hydropower production is therefore expected to evolve, while low carbon electricity could become more valuable in the context of the transition towards sustainable societies.Hydrological models have been used to evaluate the potential of hydropower plants based on simulated flows. Some of these studies represent dams and water management. However, dam ope…
Climats régionaux et régionalisation du climat
Une très grande variété de climats existe sur la Terre et des méthodes dédiées sont nécessaires pour comprendre leur variabilité et évolution dans un contexte de réchauffement climatique global. Au LMD, sont développées des approches numériques pour étudier les climats régionaux. Il s’agit historiquement du modèle global zoomé LMDZ et plus récemment du modèle régional du système Terre Reg-IPSL. Ces modèles ont permis l’étude de climats de nombreu…
Météo, climat et transition énergétique
Actuellement, la production d’énergie représente environ 35 % des émissions de gaz à effet de serre. Respecter l’accord de Paris nécessite d’avoir d’ici 2100, 90 % d’énergies décarbonées dans la consommation d’énergie primaire. Pour atteindre ces objectifs ambitieux, il est impératif d’électrifier certains usages tels que le chauffage et la mobilité. Cela implique une transformation rapide de la production énergétique actuelle, majoritairement ba…
Du « modèle de circulation générale du LMD » aux ressources en eau
Ce chapitre décrit l’évolution de nos recherches en modélisation du climat. Elles ont été centrées sur le cycle de l’eau et sa composante sur les Terres émergées. Des efforts continus sur la modélisation de ce cycle ont eu pour objectif de simuler de façon de plus en plus performante les échanges entre les surfaces et l’atmosphère. Cela a permis d’étudier les influences de la végétation sur les échanges d’eau (évapotranspiration et précipitations…
Exploring the impacts of climate change on French hydropower generation
Hydropower can play a crucial role in decarbonizing national power mixes, in particular in managing the variability of other renewable energy sources. However, climate change is expected to affect the water resources and could impact hydropower generation. This study explores the potential impacts of climate change on hydropower generation in France and its broader consequences on the national power system. To achieve this, an innovative modeling…
Modeling hydropower operations at the scale of a power grid
Climate change and evolving water management practices may have a profound impact on hydropower generation. While hydrological models have been widely used to assess these effects, they often present some limitations. A major challenge lies in the modeling of release decisions for hydropower reservoirs, which result from intricate trade-offs, involving power sector dispatch, competing water uses and the spatial allocation of power generation with…
Environmental Science (6 works) · Geography (5 works) · Climatology (4 works) · Climate change (3 works) · Climate variability and models (3 works) · Engineering (3 works) · Geology (3 works) · Hydrology and Watershed Management Studies (3 works) · Hydropower (3 works) · Atmospheric and Environmental Gas Dynamics (2 works)