|From||Olivier CAUMONT <email@example.com>|
|Date||Tue, 08 Jan 2013 14:48:18 +0100|
We are seeking applications for a 3-year PhD position commencing in October 2013, to work on the assimilation of airborne cloud radar data in the framework of the HyMeX programme (see announcement below). Please feel free to forward this announcement to potential candidates.
PhD title: Assimilation of airborne cloud radar data during the HyMeX special observing period
PhD supervisors: Dr. Olivier Caumont, Dr. Véronique Ducrocq
Deadline for application: 7 February 2013
PhD goals, proposed methodology:
The HyMeX programme (HYdrological cycle in the Mediterranean Experiment, http://www.hymex.org/) is an international, experimental programme that aims at improving our understanding of the water cycle in the Mediterranean area. Its first special observing period (SOP) took place from 5 September to 5 November 2012. The main goal of this SOP was to document the heavy precipitation events and flash floods that regularly affect the north-western Mediterranean coastal areas. In the two-month campaign, around twenty rainfall events were documented in France, Italy, and Spain.
Exceptional instrumental means (research aircrafts, drifting balloons, lidars, radars, additional radiosoundings, etc.) were deployed during the SOP and allowed to harvest a unique observational dataset. Among these instrumental platforms, the Falcon 20 of the Safire unit (http://www.safire.fr/) made numerous flights in storm systems so as to document their thermodynamic, microphysical, and dynamical properties. In particular, the cloud radar Rasta (http://rali.projet.latmos.ipsl.fr/) was aboard this aircraft. This radar measures vertical profiles of reflectivity and Doppler velocity above and below the aircraft. This unique instrument thus allows to document the microphysical properties and the speed of wind and hydrometeors in clouds, quasi-continuously in time and at a vertical resolution of 60 m.
For this field
campaign, Arome-WMed, a special
version of the numerical weather prediction (NWP) Arome system,
was developed. This version, which covers
the whole north-western Mediterranean basin, ran in
real time during the SOP in order to, notably, schedule the
airborne operations, especially in storm systems. Arome-WMed
delivers forecasts at a horizontal resolution of 2.5 km. Its
three-dimensional variational (3DVar) data assimilation system
ingests every three hours observations from a wide variety of
instruments (radiosonde, ground automatic weather station,
radar, satellite, GPS, etc.).
experiments will be carried out for one flight to begin with.
The respective roles of the reflectivity-related observations
and the Doppler velocity-related observations will be
investigated. These experiments will be compared with the
reference experiment that ran in real time during the campaign.
This comparison will be facilitated by the wealth of
observations harvested during the field campaign. The
assimilation experiments will then be run for other worthwhile
intensive observation periods of the campaign.
Required knowledge and experience:
Candidates (citizens from the European Union or Switzerland, under age 27) should hold or will obtain in 2013 a master's degree in Atmospheric, Environmental Sciences or equivalent. The applicant should be familiar with programming languages (Fortran, Unix,…), background in numerical modelling is welcome.
French or English spoken, English well-written.
full consideration, the applicant should send a detailed CV by
February, 7 to:
selected, the candidate will have to submit an application
through the armaments (DGA) portal in March.
-- Olivier Caumont CNRM-GAME UMR3589 (Météo-France, CNRS) CNRM/GMME/MICADO Météo-France 42 av G. Coriolis 31057 TOULOUSE Cedex 01 (FRANCE) Tel: +33 5 61 07 96 46 Fax: +33 5 61 07 96 26 Email: firstname.lastname@example.org Web: http://www.cnrm-game.fr/spip.php?article416
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