LSCE: post-doctoral researcher to work on atmospheric chemistry during the past climate

Offres (CDI, CDD, stage, thèse, post doc, ...)

Dear LSCE collegues,

We are looking for a motivated post-doctoral researcher to work on atmospheric chemistry during the past climate and its impact on the interpretation of the ice-core records of the oxygen isotopes of air O2. The post holder will be based at LSCE and will work under the guidance of Ji-Woong Yang in collaboration with researchers and engineers at LSCE and LATMOS.

In order to better predict future climate and carbon cycle change, it is essential that we understand the past variations of the global biosphere productivity and its control mechanism, as the global biosphere productivity is an important carbon flux between the atmosphere and the biosphere. Existing paleo-productivity proxy records from sediment cores are, however, indirect geochemical tracers and exhibit spatial heterogeneities, making it difficult to estimate the global biosphere productivity. Instead, the triple isotopic composition of air oxygen (O2) trapped in polar ice cores is the unique tracer of global biosphere productivity. We have analyzed the EPICA Dome C ice-core samples to reconstruct the variability of global biosphere productivity over the last 800,000 years.

However, many uncertainties or unknowns still exist about this fairly new tracer. The most important uncertainty originates from lack of knowledge on the isotope fractionation in the stratosphere in the past, and no proxy record exists so far. This will be addressed by combining simulations using a box model describing oxygen isotope fractionation in the stratosphere and 3-D climate-chemistry model with past cold climate boundary conditions. The successful candidate will i) perform climate-chemistry model simulations with PI (preindustrial) and LGM (last glacial maximum) boundary conditions, and ii) apply the chemistry reaction box model to calculate the isotopic composition of stratosphric O2.

Eligible candidates must have a PhD (or equivalent) in relevant subject such as (but not limited to) atmospheric sciences, chemistry, climate physics or meteorology. The candidate should be familiar with programming langauge (Fortran, Python, etc.) and working on Unix/Linux environments. The candidate must be highly motivated and have excellent time management, organisational and communication skills, and be able to work well as part of a team. A background in climate modelling and/or Quaternary climate change is desirable.

This position is fixed-term with initial appointment of 12 months, extendable depending on first year performance and funding. This position will remain open until filled. The starting date is flexible, but ideally before April 2024.

For further information or any other informal enquiries about the position, please do not hesitate to contact me via email (ji-woong.yang@lsce.ipsl.fr) or simply drop by my office (P.1048/714).

Application should be sent via e-mail to Ji-Woong YANG (ji-woong.yang@lsce.ipsl.fr) including (i) a cover letter stating your motivation for applying to this position, research experience, relevant skills and interest, (ii) a complete CV including a list of publications, and (iii) the name and contact information of two references.

Sincerely,
Ji-Woong

===================

YANG, Ji-Woong (Ph.D.)

Université Paris-Saclay, CNRS, CEA, UVSQ,

Laboratoire des sciences du climat et de l'environnement, 91191, Gif-sur-Yvette, France.

Email : ji-woong.yang@lsce.ipsl.fr

Tel: +33 (0) 1 69 08 10 90

A. Mazaud, 2023-09-28 18:21:00