Interfaces and Troposphere
Mineral dust modelled with WRF-CHIMERE online model
Regional climate and water cycle
Study of the Water cycle in InTRo is focused on the Mediterranean region, in the framework of international initiatives HyMEx and MedCORDEX, but also in the basins of the major Chinese rivers. In the Mediterranean area, studies of the hydrological cycle and hydrological extremes (extreme precipitation, dry spells) has relied in part on the RegIPSL regional coupled modelisation platform, under development in the InTRo team in collaboration with other IPSL teams. Scientific focuses in the team include interactions between aerosols and precipitation, studying the runoff of major hydrologic basin including major Chinese rivers for which anthropogenic use of the water is critical. Study of the regional water cycle is one of the strong reasons why the InTRo team is currently strongly involved in the development of the RegIPSL regional coupled model.Non permanent:
Julie André (Doc)
Laure Baratgin (Doc)
Julie Collignan (Post-doc)
Douglas Keller (Post-Doc)
Juan Pablo Sierra (Post-Doc)
C/EC permanent:
Philippe Drobinski (DR CNRS)
Thomas Dubos (Pr Polytechnique)
Patryk Kiepas (IR Polytechnique)
Sylvain Mailler (IPEF ENPC)
Romain Pennel (IR Polytechnique, TC)
Jan Polcher (DR CNRS, SC)
Impact of climate on renewable energies
The InTRo team also contributes to interdisciplinary work at the interface between atmospheric and climate sciences and energy economics and engineering. A first line of research of the team in this field deals with the potential, predictability and value of the Variable Renewable Energy (VRE, mainly wind and solar) ressource. It involves understanding the variability and trends of the VRE potential in association to dynamical and thermodynamical processes at scales ranging from the boundary layer to the planet; reexamining the statistical modelling of instant VRE value; improving sub-seasonal to seasonal prevision of VRE by combining dynamical and statistical models and estimating the economic value of such previsions. A second line of research is concerned with the long-term increase in the sensitivity of the energy system to meteorological conditions associated with increasing VRE penetration and with rising demand thermosensitivity due to electrification. These activities are underpinned by interdisciplinary collaborations within the Energy4Climate center.Non permanent:
Laure Baratgin (Doc)
Samouro Dansokho (Doc)
Joan Delort (Doc)
Camille Le Coz (Post-Doc)
Lia Rapella (Doc)
Qiqi Tao (Doc)
Ganglin Tian (Doc)
C/EC permanent:
Philippe Drobinski (DR CNRS)
Jan Polcher (DR CNRS)
Alexis Tantet (MdC Polytechnique, SC)
Chemistry-transport from urban to hemispheric scales
The study of the atmospheric composition is an important research topic in the InTRo team. In particular, the team coordinates the development of the CHIMERE chemistry-transport model, which is largely used in France and abroad for research and operational air quality simulations, including the French and European forecast platforms Prev'Air and CAMS. The main topics of research in this field include wildfire emissions with the development of the emifiresCAMS code, mineral dust emissions from arid areas and their subsequent transport, the transport of volcanic plumes as well as the development of downscaling techniques to address urban scale atmospheric pollution and population exposure with the EXPLUME model.Non permanent:
Léo Adenis (Post-Doc)
Sanhita Ghosh (Post-Doc)
Alexis Squarcioni (Doc)
C/EC permanent:
Arineh Cholakian (IE CNRS, TC)
Sylvain Mailler (IPEF ENPC)
Laurent Menut (DR CNRS, SC)
Romain Pennel (IR Polytechnique)
Myrto Valari (CNAP PA)
TC: Technical coordinator
TS: Scientific coordinator
Regional climate and water cycle: Shallow and deep convection over the southern Amazon during the dry-to-wet transition season: An analysis from twin deforested/forested experiments
Juan Pablo Sierra, Jan Polcher, Sophie Bastin, Romain Pennel, Lluis Fita, Jhan Carlo Espinoza, Sly Wongchuig
Background:
Main results:
Juan Pablo Sierra, Jan Polcher, Sophie Bastin, Romain Pennel, Lluis Fita, Jhan Carlo Espinoza, Sly Wongchuig
Background:
- Southern Amazon is the basin's most vulnerable region to anthropogenic activity (high deforestation/warming).
- Reduced rainfall, more dry days during the dry-to-wet transition, and longer dry season/shorter wet season in last decades.
Main results:
- Shallow convection occurs over crop-to-forest transition zones while deep convection is favored over forested areas.
- Deep convection is favored by specific regional flow.
- Deforestation reduces shallow convection triggered by the roughness length effect.
Impact of climate on renewable energies: Can we study
climate and socioeconomic changes separately?
Joan Delort Ylla, Alexis Tantet, Philippe Drobinski
Joan Delort Ylla, Alexis Tantet, Philippe Drobinski
- We create socioeconomic scenarios of heating demand electrification and AC adoption (MOD),
- We use CMIP5 climate change scenarios for wind and solar resource as well as temperature (+1.75oC, +2.35oC, +2.80oC, +3.28oC, +4.04oC),
- We compute indicators representing the capacity of adaptation of the power system (NAC, PAC, CoU),
- We show that these indicators need to be computed by accounting for the compound effect of climate and socioeconomic change: studying both phenomena separately is misleading.
Could we improve the forecasting skill of renewable energies?
Ganglin Tian, Camille Le Coz, Alexis Tantet
Ganglin Tian, Camille Le Coz, Alexis Tantet
- Methodology The study presents a non-linear statistical ensemble forecasting method to predict wind speeds from Z500 forecasts.It evaluates this non-linear model against ECMWF dynamic forecasts and a linear model, focusing on their skills to predict weekly-mean surface wind speeds from week 3 to week 6.
- Results
- Better probabilistic skills than ECMWF.
- Improvements to wind speed ensembles are seen across Europe.
- Perturbations improve ensemble reliability
- Improvement in MSE and CRPS with nonlinear methods is regional, such as in the North Sea.
Atmospheric pollution: Hemispheric transport of radioactive gas and aerosols plumes
Leo Adenis, Sylvain Mailler, Laurent Menut
Comparison between Eulerian and Lagrangian transport modelling
Leo Adenis, Sylvain Mailler, Laurent Menut
Comparison between Eulerian and Lagrangian transport modelling
- Two models: FLEXPART and CHIMERE
- Ruthenium 106 plume in the Northern Hemisphere
- Update of transport numerical schemes
- Better results with CHIMERE, compared to surface stations measurements
- Measurements: Station in Canada (C17) from OTICE network (Organisation du Traite d'Interdiction Complete des Essais nucleaires)
- Models: WRF-CHIMERE, simulation Fukushima 2011.
- Non reative gaseous tracers (red)
- adding nuclear dependancy (orange)
- adding semi-volatility and radioactivity (green)
- (Project LRC Yves Rocard, CEA-DAM et ENS/LMD)
Atmospheric pollution: Explicit formulae for the calculation of
the settling speed of non-spherical aerosols
Mailler S., Cholakian A., Pennel R., Menut L.
We have developed new, explicit formulae that describe the settling speed of non-spherical particles in the atmosphere, including the necessary corrections for large particles. Corrections reach:
Mailler S., Cholakian A., Pennel R., Menut L.
We have developed new, explicit formulae that describe the settling speed of non-spherical particles in the atmosphere, including the necessary corrections for large particles. Corrections reach:
- -10% for lambda=2
- -20% for lambda=4
- Take into account the probability distribution of particle orientation
- study differential advection/sedimentation in CHIMERE
- Take into account the optical effects of non-sphericity
Atmospheric pollution: CHIMERE, towards an unstructured mesh
Pennel R., Mailler S., Dubos T., Cholakian A., Menut L. (projet Escalair)
DYNAMICO
Pennel R., Mailler S., Dubos T., Cholakian A., Menut L. (projet Escalair)
DYNAMICO
- IPSL dynamical core (global and icosahedral grid)
- Development of the regional version with unstructured mesh
- Parallel efficiency : scale up to 1e4 cores / GPU oriented
- Improve performances
- Locally refined mesh in areas of interest
- Multi-scale simulations without need for nesting
- Use of DYNAMICO low level coding structure
- Time-loop
- Management of parallel mesh (MPI, allocations)
- Chemistry solved in CHIMERE and transported in DYNAMICO
DYNAMICO
Dynamical model
- Most Intro people work at the Laboratoire de Météorologie Dynamique, located on the Ecole Polytechnique campus in Palaiseau. [Site map]
- Contact by email: firstname.lastname@lmd.ipsl.fr
- Previously with INTRO
![[Site map]](images/intro_lmd.png){kind=link}
| ADENIS Léo Post-doc CEA-ENS Site:X |  | ANDRÉ Julie PhD Student, ENS Site:ENS |  | BARATGIN Laure PhD Student, Polytechnique Site:X, J |  | ||||||
| CHOLAKIAN Arineh Engineer, CNRS Site:X 51 54 |  | COLLIGNAN Julie Post-doc, Polytechnique Site:X |  | DANSOKHO Samouro PhD Student, Polytechnique Site:X 51 57 |  | ||||||
| DELORT YLLA Joan PhD Student, Polytechnique Site:X |  | DROBINSKI Philippe Research scientist, DR CNRS Site:X 51 42 |  | DUBOS Thomas Assistant Prof. Polytechnique Site:X 51 43 |  | ||||||
| GHOSH Sanhita Post-doc ADEME Site: X |  | KELLER Douglas Post-doc, Polytechnique Site:X 51 70 |  | KIEPAS Patryk Research Engineer Polytechnique Site:X 51 34 |  | ||||||
| LE COZ Camille Post-doc E4C Site:X |  | MAILLER Sylvain Research Scientist, ENPC Site:X 51 91 |  | MENUT Laurent Research scientist, DR CNRS Site:X 51 75 |  | ||||||
| PENNEL Romain Research Engineer Polytechnique Site:X 52 33 |  | PEREZ SIERRA Juan-Pablo Post-doc, Polytechnique Site:X |  | POLCHER Jan Research scientist, DR CNRS Site:X 51 46 |  | ||||||
| RAPELLA Lia PhD Student, Polytechnique Site:X, LSCE |  | SQUARCIONI Alexis PhD Student Site:CEREA, ENPC |  | TANTET Alexis Assistant Prof. Polytechnique Site:X 51 42 |  | ||||||
| TAO Qiqi PhD Student, Polytechnique Site:X |  | TIAN Ganglin Post-doc, Polytechnique Site:X |  | VALARI Myrto Assistant Physicist, Sorbonne Univ. Site:J 61 00 |  | ||||||