Total deposition Total deposition monitoring of nutrients monitoring of nutrients

in Corsicain CorsicaK. 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 CorsicaDeposition Measurements in Corsica

•Pre-acidification with pure HCl •Rinse with 60mL of 0.2M HCl solution

Deposition Measurements in CorsicaDeposition 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: ResultsDeposition measurement: Results

3.5 years of total deposition measurement of nutrients and trace metals in Corsica

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120P Si N

Deposition measurement: ResultsDeposition measurement: Results

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P fl

uxe

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P: 87-210 mg.m-2.y-1

N: 30-124 mg.m-2.y-1

Si: 150-270 mg.m-2.y-1

Deposition measurement: ResultsDeposition measurement: Results

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120.00Al P Si N

Si flux is mainly associated with Saharan dust deposition

y = 2.3533x + 0.3385

R2 = 0.9569

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Al flux (mg.m-2.w-1)

Si fl

ux (m

g.m

-2.w

-1)

0.88 ±0.34

2.92 ±0.28

Sud 30°N

0.67 ±0.05

2.67 ±0.11

Maroc W-Algérie

0.52 ±0.06

2.20 ±0.12

Tunisie

Est-Algérie

Fe/AlSi/Al

0.88 ±0.34

2.92 ±0.28

Sud 30°N

0.67 ±0.05

2.67 ±0.11

Maroc W-Algérie

0.52 ±0.06

2.20 ±0.12

Tunisie

Est-Algérie

Fe/AlSi/Al

Bergametti et al., 1989

Deposition measurement: ResultsDeposition 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: ResultsDeposition measurement: Results

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Dus

t flu

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Deposition measurement: ResultsDeposition measurement: Results

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JAN

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Dus

t flu

xes

(g/m

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onth

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0102030405060708090

JAN

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MARAPR MAY

JUN JU

LAUG

SEP

OCTNOV

DEC

Rain

(mm

/mon

th)

(Moulin et al., JGR, 1998)

Deposition measurement: ResultsDeposition measurement: ResultsCase 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

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dust

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an)

The lowest fluxes since eighties, in agreement with no intense event recorded during the sampling period

Deposition measurement: ResultsDeposition 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: ResultsDeposition measurement: ResultsCase of dust mass flux

Identification of event of dust deposition is based on :

- Dust is visible on the filter and dust flux > 8 mg/m2/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 AODSEVIRI

TERRA

Deposition measurement: ResultsDeposition measurement: ResultsCase 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 depositionLarge part of other sources?

y = 0.1086x

R2 = 0.9727

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P flux (mg.m-2.w-1)

S flu

x (m

g.m

-2.w

-1)

y = 0.69x - 1.10

R2 = 0.96

y = 7.97x + 3.92

R2 = 0.96

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0 10 20 30 40 50 60 70P flux (mg.m-2.w-1)

Knss

flux

(mg.

m-2

.w-1

)

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: ConclusionDeposition 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