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Passive samplers on moorings at three deep-ocean sites

Passive samplers on moorings at three deep-ocean sites. Kees Booij, Ronald van Bommel, Hendrik M. van Aken, Hans van Haren, Geert-Jan Brummer, Herman Ridderinkhof. Royal Netherlands Institute for Sea Research. 75. Irminger Sea. 60. 45. 30. 0. Canary Basin. -30. -45. Strait

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Passive samplers on moorings at three deep-ocean sites

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

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

  3. POM support plate anodised aluminium screen cable feed

  4. Mooring scheme Irminger Sea LOCO 3 LOCO18 LOCO17 LOCO16 LOCO15 3 km 200 km

  5. Mooring scheme Strait Mozambique 2.7 km 170 km

  6. 1.2 1.0 0.8 0.6 retained PRC 0.4 0.2 0.0 4 5 6 7 8 log K sw PRCs 5.5 L d-1 3.2 L d-1 IS2003-0.3

  7. 1.2 1.0 0.8 1 0.6 2 retained PRC 4 8 0.4 16 0.2 0.0 4 5 6 7 8 log K sw Estimate Rs by curve fitting Foppe Smedes, RIKZ, NL

  8. Canary Basin Irminger Sea R (L/d) s 0 2 4 6 8 10 0 R (L/d) R (L/d) s s 0 2 4 6 8 10 0 2 4 6 8 10 1 0 0 2 1 2 depth (km) 2 3 4 3 6 4 PRC-based sampling rates Strait Mozambique

  9. hexachlorobenzene Canary Basin Irminger Sea Strait Mozambique C (pg/L) C (pg/L) C (pg/L) 0 20 40 60 0 20 40 60 0 20 40 60 0 0 0 1 1 2 1 depth (km) 3 2 4 2 5 3 6 3

  10. 0 10 20 30 0 C (pg/L) 0 10 20 30 1 depth (km) 0 2 1 C (pg/L) 2 0 10 20 30 3 3 0 4 5 1 6 2 3 4,4’-DDE Canary Basin Irminger Sea Strait Mozambique C (pg/L)

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

  12. C (pg/L) 0 200 400 0 1 depth (km) 2 3 4 C (pg/L) C (pg/L) 0 200 400 0 200 400 0 0 1 2 1 3 4 2 5 6 3 fluoranthene Canary Basin Irminger Sea Strait Mozambique

  13. Conclusions • SPMDs can withstand > 1-y exposures in open ocean • sampling rates ~ 6 L/d (460 cm2 normalised) • extracted water volumes ~ 1 m3 • curve fitting of N/N0 vs Ksw reduces subjective judgement • Irminger Sea : moderate increase of Cw with depth • Canary Basin: sharp decrease with depth • Str. Mozamb.: low Cw for HCB, DDE, PCB, PAH • Pretty high PAH concentrations in Canary Basin and Irminger Sea

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