Spatio-Temporal Assessment of the PCB Sediment Contamination in the Four Main French River Basins (1945–2018)” by André-Marie Dendievel Et Al

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Discussions Earth Syst. Sci. Data Discuss., Earth System https://doi.org/10.5194/essd-2019-167-AC1, 2020 Science ESSDD © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Access Open Data Interactive comment

Interactive comment on “Spatio-temporal assessment of the PCB sediment contamination in the four main French River Basins (1945–2018)” by André-Marie Dendievel et al.

André-Marie Dendievel et al. [email protected]

Received and published: 27 February 2020

Many thanks to RC1 for his comments and critiques, which allowed to improve the quality of the manuscript. Based on your comments, major changes will be made to clarify and better explain the methodology of data collection and the handling of values below the quantification levels (in parts 2.2 and 2.4). The title of the paper will be modified as follows: "Spatio-temporal assessment of the PCB sediment contamination Printer-friendly version in four major French river corridors (1945-2018)". We will revise the design of the study regarding the presentation of socio-environmental data by summarizing or improving Discussion paper the elements of the new version of fig. 2 - spatial comparison of PCBs concentrations

C1 with geographical and socio-environmental drivers (former fig. 3 of the draft; see figure 1 attached to this answer). We will prepare a new version of fig. 5 – PCBi specific fluxes ESSDD and load histograms (former fig. 6 of the draft; see figure 2 attached to this answer). In parallel, we will review part 3 (results) of the draft. The former fig. 1 will be converted into a supplementary figure (suppl. Fig. 1 - see figure 3 attached). We also propose to Interactive develop and add more references about the interpretations of the pollution sources on comment the Lower Seine River. We will revise the text dealing with the interpretations of PCBs production and emission along the Rhône River. Then, we will rewrite the second part of the discussion (part 4.2) to include a comparison between the contamination of the sediment by PCBs and the implications for biota from the source to the estuary on the studied rivers.

Interactive comment on Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2019-167, 2019.

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Discussion paper

C2 ESSDD Seine River Rhône River Upper Seine Paris Lower & Estuarine Seine (f) Upper Rhône Middle Rhône Lower Rhône Eure Drôme Flow rate - Q (a) Marne 1600 Isère 600 Oise ) Seine Flow rate - Q Durance -1 Yonne ) 1200 Gier -1 s Source Saône

3 400 s Population Population 3 Ain 12 20 800 Arve

Q (m 200 Interactive Q (m 10 M inhab. 400 AVIGNON 6 M 0 inhab. 0 VALENCE (b) LYON 0 comment (g) ARLES TROYES ROUEN LE 75 Chemical 75 2012 Corridor 2012 HAVRE 50 Land 50 (c) Industrial PARIS Industrial Land Urban Megacity 25 Use (h) Urban 25 Use (%) (%) 0 0 700 600 500 400 300 200 100 0 km (i) 500 450 400 350 300 250 200 150 100 50 0 km (d) Core Bed and PARIS ROUEN 5000 5000 Core Bed & Flood Sediments Sediments Flood Sediments VALENCE

Dredged Sediments 1000 ) ) 1000 Dredged

-1 -1 SPM Sediments 500 500 Sediments LYON ARLES

100 100 Σ PCBi (µg kg Σ PCBi (µg kg 10 10

100 300 200 (n) (e) Referenced PCB Polluted sites PARIS 100 AVIGNON (n) 0 (j) Referenced PCB Polluted sites LYON 0 700 600 500 400 300 200 100 0 500 450 400 350 300 250 200 150 100 50 0 Distance Upstream of Estuarine Areas (km) Distance Upstream of Estuarine Areas (km) Loire River Garonne River Upper Loire Middle Loire Lower Loire Pyrenees and foothills Middle Garonne Lower and Marine Garonne (k) Maine (p) Vienne 800 Lot Flow rate - Q 800 Loire Allier ) Indre Flow rate - Q ) -1 Sources 600

15 -1 Gironde Estuary s 600 Cher 3 Ondaine- s Tarn Arroux 3 400 Ariège 400 Furan Population 10 6 Q (m

Q (m 200 200 NANTES M 4 5 inhab. M ANGERS 2 inhab. 0 0 BORDEAUX TOURS 0 (l) Population DIGOIN 0 (q) NEVERS ORLEANS 50 TOULOUSE Industrial ST ETIENNE 2012 Industrial 50 2012 (m) Urban 25 Land Urban Land Use (r) 25 Use 0 (%) 0 (%) 1000 900 800 700 600 500 400 300 200 100 0 km (s) 500 450 400 350 300 250 200 150 100 50 0 km 5000 5000 Core Bed & Flood Core NANTES SPM (n) Sediments ST ETIENNE Sediments Sediments Bed & Flood 1000 1000 500 ) ) 500 Lot Sediments -1 -1 TOULOUSE Con uence BORDEAUX SPM 100 100

10 10 Σ PCBi (µg kg Σ PCBi (µg kg

TOURS 1 1 NEVERS 100 BORDEAUX NANTES TOULOUSE 20 DIGOIN 50 (n) Referenced PCB ST ETIENNE Referenced PCB (n) Polluted sites Polluted sites 0 (o) 0 (t) 1000 900 800 700 600 500 400 300 200 100 0 500 450 400 350 300 250 200 150 100 50 0 Printer-friendly version Distance Upstream of Estuarine Areas (km) Distance Upstream of Estuarine Areas (km)

Discussion paper Fig. 1.

C3 ESSDD (a) 14 ) -1 12 Interactive yr -2 10 comment

4 ΣPCBi Fluxes (μg m 2

0 1977-1987 1987-1997 1997-2007 2007-2017

(b) 1400

1200

1000 ) -1 800

600

400 ΣPCBi load (kg yr 200

0 1977-1987 1987-1997 1997-2007 2007-2017

Rhône River Loire River Seine River Garonne River (48.5 km UEA) (103 km UEA) (148 km UEA) (94 km UEA) Printer-friendly version

Discussion paper Fig. 2.

C4 ESSDD

Estuarine Seine (50 km UEA) Rhône - All River 1992 - 2018 2011 - 2018 Interactive comment 150 p > 0.8 100 p = 0.5

dw) dw) 80 -1 -1 100 60 40 50 20 ∑PCBi (µg kg ∑PCBi (µg kg 0 0 Mobile Stored Mobile Stored n = 72 n = 19 n = 167 n = 455

Upper Loire (1012 - 750 km UEA) Lower Garonne (100 km UEA) 1991 - 2017 1954 - 2017

1000 p = 0.1 100 p = 0.5 dw) dw) -1 800 -1 80 600 60 400 40 200 20 ∑PCBi (µg kg 0 ∑PCBi (µg kg 0 Mobile Stored Mobile Stored n = 5 n = 54 n = 4 n = 26 Printer-friendly version

Fig. 3. Discussion paper