|From||"Roger Brugge" <firstname.lastname@example.org>|
|Date||Fri, 30 Mar 2012 07:35:30 +0000|
PhD proposition Physico-chemical and optical properties of mineral dust in the western Mediterranean: aging during transport and implications for the estimation of the direct radiative effect at the regional scale. Mineral dust emitted by soil erosion on arid and semi-arid regions contribute to about half of aerosol emission at the global scale. Because of their strong concentrations and their physico-chemical properties (size, composition and morphology), mineral dust can affect the radiative budget in the solar and the infrared spectra and therefore can affect the earth climate, with important consequences on the water cycle and the atmospheric dynamics. The Mediterranean basin is an interesting region to study the impact of the radiative perturbation of mineral dust. Semi-enclosed basin by important orography, the Mediterranean basin is the source or the transport region of several types of aerosols of natural and anthropogenic origins, e.g., sea salt, biogenic, biomass burning, industrial and urban, including mineral dust which is emitted from Africa, the most intense source at the global scale. The Mediterranean basin is submitted to a strong demographic increase and to a tendency to drought. The research proposed for this PhD position will be conducted during the ChArMEx (Chemistry-Aerosol Mediterranean Experiments) program, aiming at quantifying the direct radiative impact of mineral dust aerosols at the regional scale. The objective of the work is the characterisation of the physico-chemical properties which rule the direct radiative effect and the investigation of the effect of aging during transport over the basin, by deposition, mixing with aerosol of other origins, absorption of water vapour and by heterogeneous reactions with gaseous species. In particular, the characterisation of the surface state of dust particles and the possible coating of dust particles with organic material will be investigated. The candidate will participate to field campaign which will be conducted in June 2013 both onboard the French research aircraft ATR-42 and on the ground at the Island of Lampedusa. He/she will be in charge of aerosol sampling which will be performed using the sampling tools developed at the LISA, the AVIRAD airborne sampling system and the PEGASUS mobile platform. The results of the experimental investigation will be used to initiate modelling of the optical and radiative properties of mineral dust. The results will be compared to data obtained for dust at emission to highlight the possible effect of aging. The candidate will have a strong background in physics (preferred) or chemistry. He/She will have a good knowledge of English. Enthusiastic and highly-motivated candidates are preferred. The research will be conducted at the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), in Créteil - France (www.lisa.u-pec.fr), under the supervision of Dr. Paola Formenti (phone: 0033(0)184.108.40.206.22; email email@example.com). Funding for this scholarship is not secured but it is very likely and it will also depend on the quality of the candidate. After examination of his/her CV by the Doctoral School, he/she will be interviewed (in English if necessary, by skype if requested) in early July. The appointment will be for three years starting from September 2012. The monthly salary will be around 1700 euros net. The diploma will be awarded by the Doctoral School of the Universities Paris Marie-Pierre Curie and Paris Diderot. Paola FORMENTI Chercheur Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) UMR CNRS 7583 Faculté des Sciences et Technologies 61 Avenue du Général de Gaulle, 94010 CRETEIL Cedex Tél: 0033.(0)220.127.116.11.22 Fax: 0033.(0)18.104.22.168.64 email: firstname.lastname@example.org
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