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Portail > Offres > Offre UMR5001-VALLAN0-063 - Chercheur en modélisation régionale des sources d'aérosols atmosphériques provenant de l'océan polaire, de la glace de mer et de la neige H/F.

researcher in regional modeling of polar ocean, sea-ice, and snow sources of atmospheric aerosols (M/F)

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : mardi 14 décembre 2021

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General information

Reference : UMR5001-VALLAN0-063
Workplace : ST MARTIN D HERES
Date of publication : Tuesday, November 23, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 February 2022
Proportion of work : Full time
Remuneration : Betwenn 2 663 € and 3 783 € (depending on experience)
Desired level of education : PhD
Experience required : 1 to 4 years

Missions

Regional modeling of polar ocean, sea-ice, and snow sources of atmospheric aerosols.

Activities

Applications are invited for a 24-month postdoctoral position (1 year contract with possibility of 1 year extension) starting between January 2022 and June 2022 as part of the (CRiceS Climate Relevant interactions and feedbacks: the key role of sea ice and Snow in the polar and global climate system) H2020 project based at IGE (Institut des Géosciences de l'Environnement, https://www.ige-grenoble.fr) in Grenoble, France. Research will focus on improving model descriptions of ocean, sea-ice, and snow sources of atmospheric aerosols in the polar regions. This work will be conducted in close collaboration with polar observers within and outside the CRiceS project to provide insight into the sources of polar aerosols and for using observations to evaluate model developments. In collaboration with the team, the aim is to deliver improved representation of polar aerosols and to work in collaboration to quantify their influence on polar clouds.

The Intergovernmental Panel on Climate Change (IPCC) special report on Oceans and Cryosphere notes that: “The polar regions are losing ice, and their oceans are changing rapidly. The consequences of this polar transition extend to the whole planet and are affecting people in multiple ways.” Aerosol-cloud interactions are the single largest source of uncertainty in quantifying anthropogenic radiative forcing, and are especially difficult to constrain in the polar regions where models struggle to reproduce aerosol and cloud observations. Specifically, over the Southern Ocean, there is a well-known persistent overestimation of absorbed solar radiation linked to the poor representation of aerosols and/or clouds. In the Arctic, changing sea ice conditions are causing the natural aerosol load to change quickly from sea ice dominated emissions towards more open ocean dominated sources during portions of the year. Knowledge gaps remain in the exact nature of aerosol sources (including transported aerosols), aerosol processing (including removal processes), and the role of aerosols in forming clouds and determining cloud phase. These uncertainties significantly limit model capabilities of representing aerosol-cloud-radiation feedback mechanisms within and outside of the polar regions.

This postdoc focuses on using atmospheric modeling based using the regional model WRF-Chem (https://ruc.noaa.gov/wrf/wrf-chem/, https://gmd.copernicus.org/articles/10/3661/2017/) to develop novel and improved parameterizations of polar ocean aerosol emissions and aerosol-cloud interactions. This work at IGE is in collaboration with researchers focused on polar-aerosols and clouds at LATMOS (Paris, France) and within the international team that is part of the project. The WRF-Chem setups will include appropriate model resolutions for comparison with observations of both aerosols and clouds within the polar regions. The model also includes explicit aerosol-cloud-radiation interactions and feedbacks allowing for the assessments of their role in regional climate.

The specific goal of this postdoctoral research is to develop improved model descriptions of ocean, ice, and snow sources of polar aerosols and aerosol precursors, aerosol aging, and aerosol-cloud interactions. Further, the processes that determine aerosol growth, and the role of aerosols as cloud condensation nuclei (CCN) and/or ice nuclei (INP) will be refined. Specific attention to vertical resolution and the role of capturing the stability of the shallow polar boundary layer on fate and processing of aerosol/aerosol precursor and cloud formation.

Skills

● Ph.D. in atmospheric aerosols atmospheric chemistry, climate sciences, or related field
● Knowledge about modelling aerosols
● Experience with HPC and supercomputing environments
● Experience with Unix and Fortran
● Knowledge of NetCDF encoding and related data analysis tools (cdo, nco)
● Programming skill : scripting and visualisation (e.g. bash, R, python, ncl)
● Excellent skills in written and spoken English
● Collaborative spirit and communication skill
● Ability to work in a fast paced, international, team oriented environment

Work Context

This position is at the Institute of Environmental Geosciences (IGE), which is a public research laboratory under the supervision of CNRS/INSU, IRD, Université Grenoble Alpes (UGA) and Grenoble-INP. The IGE is also one of the main laboratories of the Observatoire des Sciences de l'Univers de Grenoble (OSUG) which is a federative structure that is part of INSU.
IGE brings together ~250 people including 150 permanent members (researchers, professors and assistant professors, engineers) and about 100 PhD students, post-doctoral fellows and temporary staff. The laboratory also hosts trainees for scientific internships and scientific visitors each year. The laboratory is located at the Université Grenoble Alpes Campus.
The postdoctoral researcher will work as a member of the IGE's CHIANTI team and will report to Jennie Thomas.

Constraints and risks

Ability to travel to workshops and meetings, including visits to Paris for collaborative work with LATMOS is required.
The research will be conducted in either French or English, however it is expected that the non-French speaking candidate will make his or her best to learn the basics of French in order to facilitate communication and integration into the laboratory.

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