post-doctoral position in atmospheric geochemistry · 2017-09-26 · post-doctoral position in...

Post-doctoral position in Atmospheric Geochemistry As part of the French Regional Program CLIMIBIO (Planning Agreement between the national and regional governments 2015-2020, http://climibio.univ-lille.fr/), the “University of the Littoral Opal Coast” in the north of France is looking for a post-doctoral researcher to contribute to a Project in Atmospheric Geochemistry. Description Trace elements including iron (Fe) serve as essential micronutrients in surface ocean waters. Iron in atmospheric deposition represents the main source of bioavailable Fe to High Nutrient Low Chlorophyll ocean regions (e.g. the Southern Ocean). While natural emissions (e.g. mineral dust) are considered the most important sources of atmospheric Fe, the aqueous solubility of natural Fe-bearing particles is very limited. Conversely, anthropogenic Fe-rich particles including fly ash (combustion aerosols) display a higher solubility. How human activities impact the transport of bioavailable Fe to the oceans remains a fundamental question being addressed in atmospheric and oceanographic studies. With the recent advances in mass spectrometry, it is now possible to measure precisely small differences in Fe isotopic compositions as they occur in many physical, geochemical and biological processes. While the isotopic signature of radiogenic isotopes such as lead has been widely used to assess the contribution of pollution aerosols to transport and deposition fluxes in the low troposphere, the use of non-traditional heavy stable isotopes such as Fe is still rare in atmospheric process studies. The reported values for Fe isotope compositions of natural aerosols (mineral dust: δ 56 Fe ≈ +0.08‰ /IRMM-014) are close to those of igneous rocks. However, our previous work has shown δ 56 Fe reaching +0.14‰ in urban aerosols influenced by industrial emissions. This project will tentatively assess the isotopic imprint of atmospheric transport on anthropogenic and natural Fe by simulating cloud processing of industrial and urban Fe-bearing particles. Isotopic analysis will be conducted in collaboration with the G- TIME laboratory of the Université Libre de Bruxelles (Belgium). To investigate the mechanisms controlling the isotope fractionation at the molecular scale, first-principles calculations based on the density functional theory (DFT) will be performed on Fe minerals mimicking studied anthropogenic Fe-bearing particles (e.g. goethite).

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Post-doctoralpositioninAtmosphericGeochemistry

AspartoftheFrenchRegionalProgramCLIMIBIO(PlanningAgreementbetweenthenationalandregionalgovernments2015-2020,http://climibio.univ-lille.fr/),the“UniversityoftheLittoralOpalCoast”inthenorthofFranceislookingforapost-doctoralresearchertocontributetoaProjectinAtmosphericGeochemistry.Description

Traceelementsincludingiron(Fe)serveasessentialmicronutrientsinsurfaceoceanwaters.IroninatmosphericdepositionrepresentsthemainsourceofbioavailableFetoHighNutrientLowChlorophylloceanregions(e.g.theSouthernOcean).Whilenaturalemissions(e.g.mineraldust)areconsideredthemostimportantsourcesofatmosphericFe,theaqueoussolubility of natural Fe-bearing particles is very limited. Conversely, anthropogenic Fe-richparticles including fly ash (combustion aerosols) display a higher solubility. How humanactivities impact the transport of bioavailable Fe to the oceans remains a fundamentalquestionbeingaddressedinatmosphericandoceanographicstudies.

Withtherecentadvancesinmassspectrometry,itisnowpossibletomeasureprecisely

smalldifferencesinFeisotopiccompositionsastheyoccurinmanyphysical,geochemicalandbiologicalprocesses.Whiletheisotopicsignatureofradiogenicisotopessuchasleadhasbeenwidelyusedtoassessthecontributionofpollutionaerosolstotransportanddepositionfluxesinthelowtroposphere,theuseofnon-traditionalheavystableisotopessuchasFeisstillrareinatmosphericprocessstudies.ThereportedvaluesforFeisotopecompositionsofnaturalaerosols (mineral dust: δ56Fe ≈ +0.08‰ /IRMM-014) are close to those of igneous rocks.However,ourpreviousworkhasshownδ56Fereaching+0.14‰inurbanaerosolsinfluencedbyindustrialemissions.ThisprojectwilltentativelyassesstheisotopicimprintofatmospherictransportonanthropogenicandnaturalFebysimulatingcloudprocessingofindustrialandurbanFe-bearingparticles. Isotopicanalysiswillbeconducted incollaborationwith theG-TIMElaboratoryoftheUniversitéLibredeBruxelles(Belgium).

Toinvestigatethemechanismscontrollingtheisotopefractionationatthemolecularscale, first-principles calculations based on the density functional theory (DFT) will beperformed on Fe minerals mimicking studied anthropogenic Fe-bearing particles (e.g.goethite).

Page 2: Post-doctoral position in Atmospheric Geochemistry · 2017-09-26 · Post-doctoral position in Atmospheric Geochemistry As part of the French Regional Program CLIMIBIO (Planning Agreement

Thisprojectisfundedbythe“UniversitéduLittoral-Côted’Opale”,theRegion«Hauts

deFrance»andtheFrenchMinistryforHigherEducationandResearch(CPER“Climibio”).CandidateProfile

Theidealapplicantwillhave:.APhDinAnalyticalChemistryorGeochemistry.Experiencewithisotopeand/ortracemetalanalysisundercleanconditions.Experiencewithadvancedanalyticalinstrumentation,suchasmassspectrometry.Experienceoffieldstudiesand,ifpossible,quantumchemistry.Enthusiasmanddiligenceinlaboratorywork.Knowledgeofsecurityrulesinthelabandinthefield.Interestinpresentingresultsatconferencesandwritingpapersforpeer-reviewedjournals.Abilitytocommunicateandworkwithmultiplestudentsandscientists.Abilitytotraveltofieldstudiesandtothedifferentregionalpartners’sites(about120kmfromDunkirk):Driver’slicenseforprivatecar..Someknowledgeof/willingnesstolearnbasicFrenchLocation:Dunkerque(Dunkirk)–NorthofFranceDuration:12months,startingnolaterthan1stJanuary2018MonthlyTake-homePay:about2150€HolidayAllowance:6weeksApplication:Toapply,sendtoPascalFlament,UniversitéduLittoral–Côted’Opale,Dunkerque,France([email protected]):

- ACurriculumVitae,includingapublicationlist- Amotivationletter- Aselectionof2-3publicationsinPDF- Thenameandcontactinformationof2references.

Deadlineforapplications:October20th2017

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