1. 1 Passive samplers on moorings at three deep-ocean sites Royal Netherlands Institute for Sea Research Kees Booij, Ronald van Bommel, Hendrik M. van Aken, Hans van Haren, Geert-Jan Brummer, Herman Ridderinkhof

2. 2 75 0 30 60 45 -30 -45 -60 0 306090120 150 180 -30-60-90-120-150 Irminger Sea Canary Basin Strait Mozambique

3. 3

4. 4 cable feed POM support plate anodised aluminium screen

5. 5 LOCO18LOCO17 LOCO16LOCO15 LOCO 3 3 km 200 km Mooring scheme Irminger Sea

6. 6 Mooring scheme Strait Mozambique 2.7 km 170 km

7. 7

8. 8

9. 9

10. 10 0.0 0.2 0.4 0.6 0.8 1.0 1.2 45678 logK sw retained PRC PRCs 5.5 L d -1 3.2 L d -1 IS2003-0.3

11. 11 4 2 8 1 16 0.0 0.2 0.4 0.6 0.8 1.0 1.2 45678 logK sw retained PRC Estimate R s by curve fitting Foppe Smedes, RIKZ, NL

12. 12 0 1 2 3 0246810 R s (L/d) 0 1 2 3 4 0246810 R s (L/d) Irminger Sea depth (km) 0 2 4 6 0246810 R s (L/d) Canary Basin Strait Mozambique PRC-based sampling rates

13. 13 Irminger Sea Canary Basin Strait Mozambique hexachlorobenzene 0 1 2 3 0204060 C (pg/L) depth (km) 0 1 2 3 4 5 6 0204060 C (pg/L) 0 1 2 3 0204060 C (pg/L)

14. 14 C (pg/L) 0 1 2 3 0102030 depth (km) 0 1 2 3 4 5 6 0102030 C (pg/L) 0 1 2 3 0102030 C (pg/L) Irminger Sea Canary Basin Strait Mozambique 4,4’-DDE

15. 15 0 1 2 3 012 C (pg/L) depth (km) 0 1 2 3 4 5 6 012 C (pg/L) 0 1 2 3 012 Irminger Sea Canary Basin Strait Mozambique PCB153

16. 16 0 1 2 3 4 0200400 C (pg/L) depth (km) 0 1 2 3 4 5 6 0200400 C (pg/L) 0 1 2 3 0200400 C (pg/L) Irminger Sea Canary Basin Strait Mozambique fluoranthene

17. 17 Conclusions SPMDs can withstand > 1-y exposures in open ocean sampling rates ~ 6 L/d (460 cm 2 normalised) extracted water volumes ~ 1 m 3 curve fitting of N/N 0 vs K sw reduces subjective judgement Irminger Sea : moderate increase of Cw with depth Canary Basin: sharp decrease with depth Str. Mozamb.: low C w for HCB, DDE, PCB, PAH Pretty high PAH concentrations in Canary Basin and Irminger Sea