August 2019
Message 43

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[Met-jobs] 2-year postdoc in Urban GHG inversions (LSCE, France)

From "Lauvaux, Thomas Claude Yves" <>
To "" <>
Date Wed, 14 Aug 2019 07:56:17 +0000


Although nations committed to major emission reductions of greenhouse gases 
(GHG) under the Paris Agreement, global fossil fuel emissions increased again 
by more than 2% in 2018, primarily due to the rapid growth in energy demand 
from emerging economies and some of the largest developed countries. As nations 
struggle to reduce their emissions, large metropolitan areas took the lead 
organized around large international consortiums to decrease their own 
contributions to fossil fuel emissions (e.g. C40 Cities). The most common 
approach to estimate GHG emissions rely primarly on invetories and energy 
production and consumption statistics, typically self-reported. To support the 
creation of inventories, approaches based on atmospheric data, called 
atmosheric inversions, a semi-independent estimate of the GHG emissions, were 
evaluated as a complementary approach to inventories based on socio-economic 
data. But atmospheric approaches are also subject to large uncertainties, 
particularly from the transport models used to assimilate concentration 
measurements, and due to the lack of information related to uncertainties in 
inventories. As atmospheric approaches are nothing else than statistical 
optimizations, uncertainties play a key role and have to be estimated 
accurately. The postdoctoral researcher will work on improving the 
quantification of uncertainties in atmospheric inversion methods including 
uncertainties in the inventories of GHG emissions from large metropolitan areas 
(e.g. Paris, Indianapolis, Los Angeles)


Two research topics will be developed in parallel with, on one hand, the 
development of an urban inversion system of CO2 fossil fuel emissions on 
multiple metropolitan areas, and on the other hand a better estimation of 
uncertainties in inventories in collaboration with experts creating these 
inventories. The inversion system will be constructed around a mesoscale 
meteorological model (WRF-CO2), an adjoint model (Lagrangian), and a Bayesian 
optimization system. The error analysis will be performed with the support of 
an international rogram called Integrated Greenhouse Gas Information System 
(IG3IS) funded by the World Meteorological Organization focusing on 
characterizing uncertainties in urban inversion systems. Severel research 
groups are engaged in an inter-comparison exercise to assess the precision and 
accuracy of high-resolution inversions. The postdoctoral researcher will 
collect results from different research teams and analyze the statistical 
significance of the results.
For the research related to inventories of emissions, the goal is to determine 
as best as possible the uncertainties affecting both the spatial and temporal 
components in CO2 emissions. In collaboration with research groups of experts 
specialized in producing such inventories (e.g. Northern Arizona University, 
Joint Research Center), the objective is to generate reliable estimates of 
uncertainties that can be used in atmospheric inversions, based on expert 
knowledge and available statistical metrics. High-resolution inventories are 
available for multiple cities around the world such as Paris, Indianapolis, Los 
Angeles, or Ozaka.


Candidates with experience in regional or urban atmospheric modeling, carbon 
cycle science, and/or data assimilation will be preferentially considered. 
Experience in programming and data analysis (Python, Fortran, Matlab/IDL, PHP, 
Web, etc.) and code development under Linux environments is desired.

The position is part of the project CIUDAD, funded by the program "Make Our 
Planet Great Again". The position will be advised by Dr. Thomas Lauvaux at the 
Laboratoire des Sciences du Climat et de l'Environnement in France. 
Applications should be sent as soon as possible and before 1 May 2019, 
including a cover letter, a CV and contact information of two references. 
Applications should be submitted through the CNRS portal (

Work Context

LSCE is a leading laboratory in environmental and climate sciences located in 
Saclay. It is part of the Institut Pierre Simon Laplace, a large consortium of 
research laboratories in the Paris area. The postdoctoral researcher will join 
a team of international experts in carbon cycle sciences and more specifically 
atmospheric inversion techniques (SATINV).

General information

Reference : UMR8212-THOLAU-003
Workplace : GIF SUR YVETTE
Date of publication : Thursday, August 08, 2019
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 November 2019
Proportion of work : Full time
Remuneration : between 2 600 and 3 100 euros (before tax) monthly depending on 
the experience of the candidate
Desired level of education : PhD
Experience required : Indifferent

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