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25th International Meeting on Organic Geochemistry IMOG 2011

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P-390<br />

A three-year survey of fluorescent dissolved organic matter in<br />

the Arcach<strong>on</strong> Bay (South Western France)<br />

Edith Parlanti, Marie-Ange Cordier, Fabienne Ibalot<br />

Université de Bordeaux, UMR 5805 CNRS, EPOC - LPTC, Talence, France (corresp<strong>on</strong>ding<br />

author:e.parlanti@epoc.u-bordeaux1.fr)<br />

Transiti<strong>on</strong>al and 0.8 coastal 0.8<br />

0.8 0.8envir<strong>on</strong>ments<br />

represent Fig. 1: HIX and BIX variati<strong>on</strong>s for water samples<br />

complex systems<br />

0.8<br />

submitted 0.8<br />

0.8 0.8 to high tidal c<strong>on</strong>diti<strong>on</strong>s, collected in Arcach<strong>on</strong> Bay sites in 2010.<br />

intensive exchange 0.8<br />

0.8<br />

0.8 0.8<br />

0.8<br />

0.8 and 0.8 mixing 0.8 between fresh water<br />

inputs and seawater. 0.8 The 0.8<br />

0.8 0.8aim<br />

of this work was to No marked seas<strong>on</strong>ality was shown for the tributaries;<br />

apply fluorescence 0.7<br />

0.7<br />

spectroscopy 0.7<br />

0.7<br />

0.8<br />

0.7<br />

for tracing dissolved <strong>on</strong> the other hand a specific FDOM from each<br />

organic matter 0.7 0.7(DOM)<br />

sources 0.7<br />

0.7<br />

and cycling in an tributary site was observed (Fig 2.)<br />

ec<strong>on</strong>omically 0.7<br />

0.7<br />

important 0.7<br />

0.7<br />

coastal<br />

0.7<br />

area: the Arcach<strong>on</strong><br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

Bay (French Atlantic 0.6 coast). 0.7 0.6This<br />

site is well known for<br />

BIX La Leyre<br />

0.6<br />

0.7 0.6<br />

BIX La Leyre<br />

0.6 0.7<br />

BIX Banc d‘Arguin BIX Lant<strong>on</strong><br />

tourism and 0.6 0.6French<br />

0.6<br />

BIX<br />

oyster producti<strong>on</strong> and is<br />

Bélisaire<br />

BIX Canal des étangs<br />

0.6 0.6<br />

BIX Grand Banc BIX Cirès<br />

particularly sensitive 0.6 to 0.6 envir<strong>on</strong>mental degradati<strong>on</strong><br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7 0.7<br />

0.7<br />

0.7<br />

0.7<br />

BIX Ile aux Oiseaux BIX Bourg<br />

0.6 0.6<br />

BIX Eyrac<br />

BIX La Hume<br />

and to anthropogenic 0.6 inputs 0.6 mainly due to urban,<br />

BIX Le Tès<br />

BIX Craste de Nezer<br />

agricultural, tourism 0.5<br />

0.6 0.5<br />

BIX Betey<br />

0.5<br />

0.6 0.5<br />

BIX Betey<br />

and harbour activities.<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6 0.6<br />

0.6<br />

0.6<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

0.5<br />

0.5 0.6<br />

BIX P<strong>on</strong>teils<br />

0.6<br />

0.5<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6 0.6<br />

0.6<br />

0.6<br />

0.6<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

0.5<br />

0.5 0.6<br />

BIX P<strong>on</strong>teils<br />

0.5 0.6<br />

BIX P<strong>on</strong>teils<br />

0.5<br />

0.5 0.5<br />

A three-year survey<br />

0.5 0.5<br />

0.5 of fluorescent 0.5 dissolved organic<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

matter (FDOM) 0.5 0.5was<br />

undertaken<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

<strong>on</strong> 15 stati<strong>on</strong>s of the<br />

0.4 0.5 0.4<br />

Arcach<strong>on</strong> Bay 0.4from<br />

2008 0.4 0.5<br />

0.4<br />

0.4 0.5<br />

until 2010. Surface water<br />

samples were<br />

0.4<br />

0.4<br />

collected 0 0.4 from 5 0<br />

the Arcach<strong>on</strong> 105 1510 Bay (6 2015 2520 3025 3530<br />

35<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4 0.4<br />

0.4<br />

0.4<br />

0.4 0.4<br />

0.4 0.4<br />

0 0.4 5<br />

0 10 5<br />

10<br />

5 15 10<br />

15<br />

10 20 15<br />

20<br />

15 25 20<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

25<br />

20 30 25<br />

30<br />

25 35 30 35<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4 0.4<br />

0.4<br />

0.4<br />

0.4 0.4<br />

0.4 0.4<br />

0 0.4<br />

0.4<br />

35<br />

30 35<br />

stati<strong>on</strong>s) with 0.4a<br />

step 0<br />

5<br />

0<br />

of 0.4 sampling 5<br />

0 10<br />

of 10<br />

5 15<br />

3-4 m<strong>on</strong>ths 15<br />

10 20<br />

HIX for 20<br />

15<br />

HIX<br />

25<br />

25<br />

20 30<br />

0 0 0 0 0 0 0 0 0 0 0 5 5 5 5 5 5 5 5 5 5 5 30<br />

25 35<br />

10 10 10 10 10 10 10 10 10 10 35<br />

30 35<br />

0.4 0 15 15 15 15 15 15 15 15 15 15 15 20 20 20 20 20 20 20 20 20 20 20 25 25 25 25 25 25 25 25 25 25 25 25 30 30 30 30 30 30 30 30 30 30 30 35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

35 35<br />

35<br />

35<br />

35<br />

0.4<br />

0 5 10 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 020 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 25 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 30 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 35 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

35 35<br />

35<br />

35<br />

35<br />

35<br />

0 0.4<br />

5<br />

0 10<br />

5<br />

10<br />

5 15<br />

10<br />

15<br />

10 20<br />

15<br />

5 0 10 5 1510HIX 20<br />

25<br />

25<br />

30<br />

30<br />

35<br />

35<br />

0.4 0<br />

FDOM screening. On the other hand, the 9 HIX<br />

2015 HIX2520<br />

3025 3530<br />

35<br />

0 0.4<br />

5 10 15 HIX 20<br />

15<br />

20<br />

0.4<br />

HIX25<br />

20<br />

25<br />

30<br />

25<br />

30<br />

35<br />

30<br />

35<br />

0.4<br />

0 5 10 15 35<br />

0.4<br />

0 5 10 15 HIX<br />

20 25 30 35<br />

0 0.4 0 5 10 15 20 25 30 35<br />

5 0 10 5 15 10<br />

5 0 10 5 1510main HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX 2015 HIX25<br />

30 35<br />

tributaries of the Bay<br />

0<br />

0.4<br />

HIX<br />

20 25 30 35<br />

0 5<br />

were<br />

5 0 10<br />

m<strong>on</strong>thly sampled.<br />

10 5 15 HIX<br />

20 15 HIX2520<br />

3025 3530<br />

35<br />

0 0.4<br />

HIX 20 25 30 35<br />

0.4 5 0 10 5 1510 15 10<br />

HIX 2015 HIX<br />

HIX 20 25 30 HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX 20 25 35<br />

2520 30<br />

3025 35<br />

0 5 3530<br />

35<br />

0<br />

10<br />

0<br />

5<br />

15 HIX 2015 HIX25<br />

30 35<br />

0<br />

0.4 0.40<br />

HIX<br />

5 0<br />

5<br />

10 5<br />

10<br />

15 10<br />

15<br />

5<br />

10 HIX 20 15 HIX 20 25 30 35<br />

10<br />

15 HIX<br />

HIX 20<br />

25 2520 FIG. 2: 20<br />

30 3025 HIX and 25<br />

35 3530<br />

35<br />

0<br />

0<br />

5<br />

5<br />

10<br />

10<br />

15 HIX 20<br />

25<br />

25<br />

30<br />

30<br />

35<br />

35<br />

0<br />

0<br />

5<br />

5<br />

10<br />

10<br />

15 BIX variati<strong>on</strong>s 30 - Arcach<strong>on</strong> 35 Bay and<br />

EEM fluorescence spectra were recorded using<br />

HIX 15<br />

20<br />

HIX 20<br />

25<br />

25<br />

30<br />

30<br />

35<br />

HIX 20 25 30 35<br />

HIX HIXa<br />

HIX<br />

tributaries. HIX<br />

Fluorolog FL3-22 SPEX – JOBIN YVON fluorometer. HIX<br />

Spatial and temporal variati<strong>on</strong>s of DOM fluorescence<br />

properties were observed. We observed seas<strong>on</strong>al<br />

effects and different trends in compositi<strong>on</strong> as well as<br />

in behaviour or producti<strong>on</strong> of FDOM.<br />

Fluorescence indices were also calculated and<br />

discussed (HIX -humificati<strong>on</strong> index, and BIX -<br />

biological autochth<strong>on</strong>ous input index). These two<br />

indices showed spatial and seas<strong>on</strong>al variati<strong>on</strong>s of the<br />

quality of FDOM from the Arcach<strong>on</strong> Bay as shown as<br />

an example in Fig. 1 for samples collected in 2010.<br />

BIX BIX<br />

BIX BIX<br />

BIX BIX<br />

BIX BIX<br />

BIX BIX<br />

BIX BIX<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.8<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.7<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.6<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

0.5<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

SUMMER<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

BIX BIX BIX<br />

JULY-<br />

OCTOBER<br />

MARCH<br />

WINTER<br />

JANUARY<br />

15 20 25 30 35<br />

15 20 25 30 35<br />

BIX Banc d‘Arguin<br />

BIX Bélisaire<br />

BIX Grand Banc<br />

BIX Ile aux Oiseaux<br />

BIX Eyrac<br />

BIX Le Tès<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

0.4<br />

15 HIX 20 0 0 0 0 0 0 5 5 5 5 5 5 25 10 10 10 10 10 10 30 15 15 15 15 15 15 20 20 20 20 20 20 35 25 25 25 25 25 25 30 30 30 30 30 30 35<br />

35<br />

35<br />

35<br />

35<br />

35<br />

15 HIX 20 25 30 35<br />

15<br />

HIX<br />

20 25 30 35<br />

15 HIX<br />

20 25 30 35<br />

15 20 25 30 HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX<br />

HIX 35<br />

15 HIX<br />

HIX 20 25 30 35<br />

HIX<br />

HIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX<br />

BIX BIX BIX BIX BIX BIX<br />

The analysis of FDOM of waters from the Arcach<strong>on</strong><br />

Bay and from its main tributaries during a three-year<br />

survey allowed to discriminate between various<br />

sources of colloidal organic matter and showed the<br />

spatial and temporal variability of the signatures of the<br />

various sources.<br />

519

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