|From||Gwenael Berthet <Gwenael.Berthet@cnrs-orleans.fr>|
|Date||Mon, 27 Nov 2017 14:45:00 +0100|
Application deadline: 8 December 2017
As part of the TTL-Xing project (ANR French funding agency) applications are invited for a 2-year post-doctoral research position to carry out studies on the Asian Tropopause Aerosol Layer (ATAL) in the monsoon anticyclone using ground-based, balloon-borne, aircraft and satellite observations.
Available in situ observations of the Asian Monsoon region and especially for the ATAL have been very limited. Some observations of ozone, water vapour and aerosol using balloons have been sparsely performed from Western China and from India in particular during the BATAL 2014-2017 campaign. StratoClim observations conducted in summer 2017 were based on flights (up to 20km) of the Geophysica aircraft over the Asian monsoon area with measurements of chemical compounds and aerosol properties. The aircraft flights were conducted near some of the main convective sources in this region.
In the frame of the BATAL 2018 campaign and a scientific collaboration with Jean-Paul Vernier from NASA-LARC, we plan to set up observations in summer 2018 from Hyderabad (India) using balloons to complement the information provided by the StratoClim observations. The vertical distribution of aerosols will be obtained from the ground to altitude levels above the StratoClim aircraft flight range using optical particle counters (OPCs) providing a wide particle size range (0.2-100 μm) and with the capability to highlight optically the presence of carbonaceous and icy particles as demonstrated in summer 2015 in the frame of the BATAL campaign. Also, OPC data have been shown to be valuable to infer the presence of gravity waves generated by convective systems through their effect on the aerosol concentrations, potentially explained by the change in the nucleation rate. Ozone soundings with ECC sondes will be associated with the OPC flights. The combined aerosol-gas observations will document the bulk nature and vertical structure of the ATAL and its link with convection and large scale-circulation. Furthermore, these ozone measurements will complement IAGOS commercial aircraft data (<12km).
The work of the TTL-Xing post-doc hired at LPC2E will be devoted to the analysis of these data. Aerosol observations will be compared to complementary observations from space-borne instruments (such as the CALIOP/Calipso and CATS lidars, UV-visible spectrometers like SAGE III and OMPS and others) in terms of aerosol extinction and altitude of the ATAL. These observations will provide new information on aerosol's key parameters, to assess model simulations in terms of micro-physical processes and pertinence of the emission inventories. Observations will be compared with the CESM and Meso-NH (respectively global and regional) models and analyzed using Lagrangian methods. Comparisons between the observations from the various campaigns will be conducted to investigate the processes impacting the variability of the spatial extent and of the micro-physical properties of the aerosols within the ATAL closely or remotely influenced by convection.
Another task will be to characterize and quantify the effect of Asian monsoon circulation on the composition of the extra-tropical and tropical stratosphere. Continuous lidar observations performed at NDACC mid-latitude and tropical sites, in combination with global-coverage spaceborne observations by CALIOP, OMPS, SAGE III and CATS missions, will be used to investigate the spatial and temporal evolution of the aerosols in the ATAL and at higher latitudes subsequently to the monsoon anticyclone breakdown.
Workplace is Laboratoire de Physique et Chimie de l’Environnement et de l’Espace (LPC2E/CNRS), Orleans, France. Regular visits to Laboratoire de Météorologie Dynamique (LMD-Ecole Normale Supérieure, Paris) are planned. The applicant will also interact with a team in Laboratoire d’Aérologie (Toulouse, France) who will provide results from mesoscale simulations with the Meso-NH model explicitly representing convective clouds and with a team in LATMOS (Paris) for the investigation of the extratropical aerosol content. The postdoctoral work will be also associated with a second postdoctoral study located at LPC2E and focusing on the modeling of the ATAL region with the CESM model.
The net monthly salary based on the French academic scale will depend upon experience, from about 2000 € to 3100 €. Holiday entitlement is 45 days plus public holidays. The post is full time, fixed term for 24 months preferably starting on February 2018.
Desired skills and experience:
Interested candidates must have:
· PhD in a relevant field (e.g. atmospheric chemistry, microphysics, meteorology)
· Programming experience (e.g. IDL, PYTHON, MATLAB, FORTRAN)
· Ability to work independently while contributing to a team effort
· Very good communication skills in English, both oral and written
· Interest in atmospheric aerosol processes, in situ data and climate monitoring
Applications consisting of a CV, list of publications, letter of motivation (1 page max), and contact details of two referees (or directly supporting letters) should be sent to:
Dr Gwenaël BERTHET, LPC2E/CNRS, Orléans: email@example.com
Dr Fabrice JEGOU, LPC2E/CNRS, Orléans: firstname.lastname@example.org
Dr Pasquale SELLITTO, LMD-ENS, Paris: email@example.com
About the workplaces:
LPC2E has an internationally recognized expertise in the development of optical platforms and instruments dedicated to the characterization of the atmospheric composition from the ground to the high atmosphere. On a regular basis, these competences have resulted in collaborations with European scientists needing the use of the LPC2E observation platforms and instruments/data for aerosols and chemical species. LPC2E has long experience in the study of processes controlling the UTLS region in terms of chemical composition and aerosol content at all latitudes through in situ experiments but also using model development and 3-D simulations from local to global scales.
The central research topic of LMD is the Earth Climate, its dynamics and future evolution. For this purpose, LMD has developed the AGCM LMDz, which is today the atmospheric component of the IPSL ESM. In the near future (next 4 years), the tasks at LMD will be focused on the analysis of the climate evolution, the anthropogenic influence on the climate, and on the physics dynamics of the geophysical fluids and of the earth surface. The present application, by its large contribution to the modelling efforts at LMD as well as by its theoretical aspects entirely fits within the LMD's scientific topics. LMD enjoys a quite unique experience both in satellite remote sensing and atmospheric modelling, from process to climate scale.
Post-doc_anouncement_Aerosol Monsoon Anticyclone-Observations_TTL-Xing.pdf
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