Total deposition monitoring of nutrients in Corsica K. Desboeufs, E. Bon Nguyen, P. Simeoni, S. Chevaillier, F. Dulac, C. Guieu ANR DUNE

–Total deposition measurements –Weekly samplings from March 2008 to October 2011 –Local maintenance by Pasquale Simeoni (National Park of Corsica Region) Deposition Measurements in Corsica Deposition Measurements in Corsica Pre-acidification with pure HCl Rinse with 60mL of 0.2M HCl solution

Deposition Measurements in Corsica Deposition Measurements in Corsica Experimental protocol (in clean room): 1.Weighing before ad after collect  total volume + rainfall estimation 2.No filtered part  Estimation of particles size distribution 3.Filtration (0.2 µm) –Analyses of dissolved phase: ICP-AES or MS (majors + trace metals) + IC (Ntot) –Analyses of particulate phase : XRF (Al, As, Co, Ca, Na, K, Mg, P, Pb, Si, Fe, Ti, V, Zn)

Deposition measurement: Results Deposition measurement: Results  3.5 years of total deposition measurement of nutrients and trace metals in Corsica

Deposition measurement: Results Deposition measurement: Results P: mg.m -2.y -1 N: mg.m -2.y -1 Si: mg.m -2.y -1

Deposition measurement: Results Deposition measurement: Results Si flux is mainly associated with Saharan dust deposition Bergametti et al., 1989

Deposition measurement: Results Deposition measurement: Results Typical samples of dust event Estimation of dust mass deposition from : -sum of oxides - from Al content (7%) (Guieu et al.,2010) Case of dust mass flux

Deposition measurement: Results Deposition measurement: Results

(Moulin et al., JGR, 1998)

Deposition measurement: Results Deposition measurement: Results Case of dust mass flux Time-series of dust flux in Corsica Löye-Pilot et al., 1996; Guieu et al., 2010; Ternon et al., 2010 This study The lowest fluxes since eighties, in agreement with no intense event recorded during the sampling period

Deposition measurement: Results Deposition measurement: Results 2 majors sources of dust: Tunisia-E. Algeria and Morocco-W. Algeria in agreement with the previous works (Bergametti et al., 1989) Formenti et al., 2014

Deposition measurement: Results Deposition measurement: Results Case of dust mass flux Identification of event of dust deposition is based on : - Dust is visible on the filter and dust flux > 8 mg/m 2 /week (median of flux considering as the background level) + African dust event was identified during the week by : aerosol maps (DREAM, NAAPS), Satellite images (SeaWiFS, MODIS, SEVIRI), air masses trajectory (HYSPLIT), AOD measurements (AERONET) or PM10 concentrations (Qualitair Corse). MODIS AOD SEVIRI TERRA

Deposition measurement: Results Deposition measurement: Results Case of dust mass flux Identification of 32 dust events on 157 sampled weeks:  34% P flux associated to dust deposition  19% N flux associated to dust deposition Large part of other sources? 12% P flux associated to S Ship plume? Domestic fuel? 54% P flux associated to Knss 10% from Mineral dust (local source? Carbonates?)? 44% from Biomass burning? + correlation with Mg and Ca

Deposition measurement: Conclusion Deposition measurement: Conclusion  3.5 years of total deposition measurement of nutrients and trace metals in Corsica  Dust flux during this peraiod shows the lowest valeus since eighties but dust sources providing Corsica seem the same.  Identification of nutrients origins  Si flux associated to Saharan dust deposition  19% N flux associated to Sahran dust deposition but no identifiaction of other source: gaseous exchange?  P flux is issued for :  34% associated to Sahran dust deposition  12% associated to S deposition  10% associated to mineral dust deposition  44% associated to biomass burning