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<p><small><span style="font-family: CopperplateGothic;
font-weight: 700; "><font size="5"><small>3-year
post-doc position at LSCE: </small></font></span></small></p>
<p><small><font size="5"><small><span style="font-family:
CopperplateGothic; font-weight: 700; ">Data
assimilation in a regional ecosystem-atmosphere
modelling framework for the study of
CO</span><span style="font-family:
CopperplateGothic; font-weight: 700;
vertical-align: -1pt; ">2 </span><span
style="font-family: CopperplateGothic;
font-weight: 700; ">natural fluxes in Europe</span></small></font><span
style="font-size: 14pt; font-family:
CopperplateGothic; font-weight: 700; "> </span></small></p>
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<div>LSCE - Laboratoire des Sciences du Climat et de
l'Environnement </div>
<div>CEA - L'Orme des Merisiers,<br>
91191 Gif sur Yvette Cedex, </div>
<div>France</div>
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<p><span style="font-size: 12.000000pt; font-family:
'CopperplateGothic'; font-weight: 700">Context:
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The regional quantification
of CO</span><span style="font-size: 8.000000pt;
font-family: 'TimesNewRomanPSMT';
vertical-align: -1.000000pt">2 </span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">ecosystem to atmosphere
fluxes and the understanding of the
underlying processes are critical to predict the
fate of the European carbon budget and to
support
greenhouse gas (GHG) emission mitigation in the
context of global changes. Recent and promising
approaches rely on the use of data assimilation
techniques with state of the art ecosystem and
transport models. On one hand, the atmospheric
inversion method derives the surface fluxes that
best fit with atmospheric CO</span><span
style="font-size: 8.000000pt; font-family:
'TimesNewRomanPSMT'; vertical-align:
-1.000000pt">2 </span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">measurements,
using an atmospheric transport model. On the
other
hand, complementary systems are currently
developed to assimilate a wide range of carbon
related
observations to optimize the parameters of
process-based terrestrial carbon models
(CCDASs). The
ICOS infrastructure now provides an
unprecedented amount of atmospheric CO</span><span
style="font-size: 8.000000pt; font-family:
'TimesNewRomanPSMT'; vertical-align:
-1.000000pt">2 </span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">measurements,
eddy
covariance carbon, water and energy flux
measurements and biomass data in Europe that can
be exploited with these systems to better
understand the variations of ecosystem fluxes at
high
spatial and temporal resolution.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The post doc will be
connected to the EUROCOM bilateral project
(between LSCE in France and
the University of Lund in Sweden) in
collaboration with other leading European
institute in the field
of carbon data assimilation. EUROCOM aims at
studying the European ecosystem fluxes and
associated uncertainties at high space and time
resolution, based on the development of a novel
regional modeling framework capable of
assimilating various carbon cycle measurements
from
ICOS and from satellite observation. EUROCOM
will also coordinate an inter-comparison of
state
of the art regional model data fusion approaches
(inversions and CCDASs) from the European
research community.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">LSCE is an internationally
renowned institute in the field of
biogeochemical cycles and climate
research. It has a strong expertise in inverse
modeling of GHG fluxes and in the development of
carbon cycle data assimilation systems. It has
developed a variational meso-scale inversion
framework at European scale solving for 6-hourly
fluxes on a grid of 50 by 50 km based on the
CHIMERE transport model (Broquet et al. 2011,
JGR; Broquet et al. 2013, ACP) as well as an
advanced data assimilation framework to optimize
the parameters of the ORCHIDEE vegetation
model (see <a
href="http://orchidas.lsce.ipsl.fr/">http://orchidas.lsce.ipsl.fr/</a>).
</span></p>
<p><span style="font-size: 11.000000pt; font-family:
'CopperplateGothic'; font-weight: 700">Position
summary:
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The successful candidate
will run and analyse the results of i) the
European variational atmospheric
inversion system and ii) the coupling between
this system and a regional CCDAS based on a new
version of ORCHIDEE (including management
effects on forest, grass and crops). He will
thus
directly participate to the development and
application of the first regional model
data-fusion
approach combining atmospheric inversion and
optimization of process-based terrestrial model
parameters to assimilate multiple-data streams
(atmospheric CO</span><span style="font-size:
8.000000pt; font-family: 'TimesNewRomanPSMT';
vertical-align: -1.000000pt">2</span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">, eddy covariance fluxes,
satellite
vegetation indices and possibly biomass
measurements). He will study the recent dynamics
of CO2
ecosystem fluxes in Europe (mean fluxes and
inter-annual variations) and the underlying
processes,
using the results of this coupled system and the
results from the University of Lund based on a
similar approach. He will also help to establish
an inter-comparison of regional data
assimilation
systems in Europe that use ICOS observations.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The successful candidate
will work nearly full time at LSCE (LSCE,
CEA-Orme des Merisiers,
91191 Gif sur Yvette cedex, France), with the
teams dedicated to inverse modeling, ecosystem </span><span
style="font-family: TimesNewRomanPSMT;
font-size: 12pt; ">modeling and GHG atmospheric
measurements. He will also have the opportunity
to spend some
time at the Lund University for inter-comparison
exercises using the framework of the Carbon
Portal of ICOS.</span></p>
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<p><span style="font-size: 11.000000pt; font-family:
'CopperplateGothic'; font-weight: 700">Applications:
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The candidate should have a
PhD with experience / knowledge in data
assimilation, carbon cycle,
atmospheric modeling, ecosystem modeling or more
generally in modeling tools and statistics. The
candidate should be autonomous and able to work
with computing tools such as Fortran and/or
python, and with complex model codes in UNIX
environment. He should also have good
communication skills.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">The salary will be
commensurate with experience, on the order of
33000 euros net per year,
including full health care and retirement
pension benefits. Applications should include a
CV and a
cover letter, and if possible the names of two
reference persons. They should be sent to
Grégoire
Broquet (</span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT';
color: rgb(0.000000%, 0.000000%, 50.196080%)"><a
href="mailto:gregoire.broquet@lsce.ipsl.fr">gregoire.broquet@lsce.ipsl.fr</a></span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'; color: rgb(0.000000%,
0.000000%, 100.000000%)">) </span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">and Philippe Peylin (</span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'; color: rgb(0.000000%,
0.000000%, 50.196080%)"><a
href="mailto:philippe.peylin@lsce.ipsl.fr">philippe.peylin@lsce.ipsl.fr</a></span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">). The
applications should be sent, and the position
will start in as soon as possible.
</span></p>
<p><span style="font-size: 11.000000pt; font-family:
'CopperplateGothic'; font-weight: 700">Some
relevant publications:
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">Broquet, G., F. Chevallier,
P. Rayner, C. Aulagnier, I. Pison, M. Ramonet,
M. Schmidt, A. T.
Vermeulen, and P. Ciais (2011), A European
summertime CO2 biogenic flux inversion at
mesoscale from continuous in situ mixing ratio
measurements, </span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPS';
font-style: italic">Journal of Geophysical
Research-
Atmospheres</span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">,
</span><span style="font-size: 12.000000pt;
font-family: 'TimesNewRomanPS'; font-style:
italic">116</span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">,
doi:Artn D23303.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">Broquet, G., et al. (2013),
Regional inversion of CO2 ecosystem fluxes from
atmospheric
measurements: reliability of the uncertainty
estimates, </span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPS';
font-style: italic">Atmospheric Chemistry and
Physics</span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">,
</span><span style="font-size: 12.000000pt;
font-family: 'TimesNewRomanPS'; font-style:
italic">13 </span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">(17),
9039-9056,
doi:Doi 10.5194/Acp-13-9039-2013.<br>
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">Kuppel, S., Peylin, P.,
Chevallier, F., Bacour, C., Maignan, F., and
A.D. Richardson (2012),
Constraining a global ecosystem model with
multi-site eddy-covariance data, </span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPS'; font-style: italic">Biogeosciences</span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">, 9, 10. </span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">Kuppel, S., Chevallier, F.
and P. Peylin, (2013), Quantifying the model
structural error in carbon
cycle data assimilation systems, </span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPS'; font-style: italic">geoscientific
model development</span><span style="font-size:
12.000000pt; font-family: 'TimesNewRomanPSMT'">,
6, 1, 45-55, DOI:10.5194/gmd-6-
45-2013.
</span></p>
<p><span style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">Santaren, D., Peylin, P.,
Viovy, N., and P. Ciais (2007), Optimizing a
Process based Ecosystem
Model with Eddy-Covariance Flux Measurements:
Part 1. A Pine Forest in Southern France, </span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPS'; font-style: italic">Global
Biogeochemical cycle</span><span
style="font-size: 12.000000pt; font-family:
'TimesNewRomanPSMT'">, 21 (2). </span></p>
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<pre class="moz-signature" cols="72">--
Grégoire Broquet <a class="moz-txt-link-rfc2396E" href="mailto:gregoire.broquet@lsce.ipsl.fr"><gregoire.broquet@lsce.ipsl.fr></a>
Laboratoire des Sciences du Climat et de l'Environnement
L'Orme des Merisiers, Bat 701, Point courrier 129
91191 Gif sur Yvette Cedex, France
Tel: +33 (0) 1 6908 8687 / Fax: +33 (0) 1 6908 7716
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