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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

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

Mozambique

-60

-150

-120

-90

-60

-30

150

0

30

60

90

120

180


POM support plate

anodised

aluminium

screen

cable feed


Mooring scheme Irminger Sea

LOCO 3

LOCO18

LOCO17

LOCO16

LOCO15

3 km

200 km


Mooring scheme Strait Mozambique

2.7 km

170 km


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


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


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


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


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)


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


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


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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