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

75

0

30

60

45

-30

-45

-60

0 30 60 90 120 150 180-30-60-90-120-150

Irminger Sea

Canary Basin

Strait Mozambique

3

4

losse pen

cable feed

POM support plate

anodised aluminium

screen

5

LOCO18 LOCO17 LOCO16 LOCO15

LOCO 3

3 km

200 km

Mooring scheme Irminger Sea

6

Mooring scheme Strait Mozambique

2.7 km

170 km

7

ACO U STIC RE LEAS ES

5200

6 M E TE R KETTIN G

611 kg

STRO O M M E TER AA NDERA A RCM 11 4460

STRO O M M E TER AA NDERA A RCM 11 3863

STRO O M M E TER AA NDERA A RCM 11 2364

BM TI 800/4000 + Long ranger BMT 1462

STRO O M M E TER VALEP ORT 1563

CRPCRP 1500/300 1662

STRO O M M E TER 3115AQ UA DO PP

8

9

10

0.0

0.2

0.4

0.6

0.8

1.0

1.2

4 5 6 7 8logKsw

reta

ined

PR

CPRCs

5.5 L d-1

3.2 L d-1

tN

N

k

0

s

e

ln

sswes VKkR

IS2003-0.3

11

42

8

1

16

0.0

0.2

0.4

0.6

0.8

1.0

1.2

4 5 6 7 8logKsw

reta

ined

PR

CEstimate Rs by curve fitting

ssw

s

0

s expVK

tRN

N

Foppe Smedes, RIKZ, NL

12

0

1

2

3

0 2 4 6 8 10

Rs (L/d)

0

1

2

3

4

0 2 4 6 8 10

Rs (L/d)

Irminger Sea

dept

h (k

m)

0

2

4

6

0 2 4 6 8 10

Rs (L/d)

Canary Basin

Strait Mozambique

PRC-based sampling rates

13

Irminger Sea

Canary Basin

Strait Mozambique

hexachlorobenzene

0

1

2

3

0 20 40 60

C (pg/L)

dept

h (k

m)

01

234

56

0 20 40 60

C (pg/L)

0

1

2

3

0 20 40 60C (pg/L)

14

C (pg/L)

0

1

2

3

0 10 20 30

dept

h (k

m)

0

12

3

45

6

0 10 20 30

C (pg/L)

0

1

2

3

0 10 20 30C (pg/L)

Irminger Sea

Canary Basin

Strait Mozambique

4,4’-DDE

15

0

1

2

3

0 1 2

C (pg/L)

dept

h (k

m)

0

1

23

4

5

6

0 1 2

C (pg/L)

0

1

2

3

0 1 2

C (pg/L)

Irminger Sea

Canary Basin

Strait Mozambique

PCB153

16

0

1

2

3

4

0 200 400C (pg/L)

dept

h (k

m)

0

1

2

3

4

5

6

0 200 400

C (pg/L)

0

1

2

3

0 200 400

C (pg/L)

Irminger Sea

Canary Basin

Strait Mozambique

fluoranthene

17

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