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Flow of Atlantic water to the North Icelandic shelf in relation to drift of cod larvae

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Title: Flow of Atlantic water to the North Icelandic shelf in relation to drift of cod larvae


1
Flow of Atlantic water to the North Icelandic
shelf in relation to drift of cod larvae
  • Steingrímur Jónsson1,2 and Héðinn Valdimarsson1
  • 1Marine Research Institute and
  • 2University of Akureyri

2
Valdimarsson and Malmberg (1999)
3
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4
Spawning areas (green) and main patterns of egg
and larval transport (arrows) at Iceland and
Greenland
5
Begg and Marteinsdóttir 2000
Mean (1970-1998) spatial distribution of relative
abundance (number/nm) of pelagic juvenile cod
6
Map of the area. The red dots denote current
meter positions and the blue denote CTD stations.
Depth contours are 100, 200, 500 and 1000 meters.
7
Salinity on the Hornbanki section. Also shown is
the position of the current meters as yellow dots.
8
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9
Nov 2001
Nov 2002
Nov 2003
10
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11
Salinity on the Hornbanki section. Also shown is
the position of the current meters as yellow dots.
12
Time series of temperature from the current
meters. Also shown is the average of the E-W
component of the velocity at mooring H3 at 84m
depth (black line). Each tick on the x-axis
denotes the beginning of the corresponding month.
The yellow lines indicate the times when CTD
sections were taken. Data are weekly running
averages.
13
Map of the area. The red dots denote current
meter positions and the blue denote CTD stations.
Depth contours are 100, 200, 500 and 1000 meters.
14
Potential temperature across the Denmark Strait
at the sill, Sep. 1997.
15
PW
AW
AIW
DW
16
LB6 80m
KG6 80m
17
LB6 80m
HB2 80m
KG6 80m
18
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19
3.5 Sv 124 TW
0.75 Sv 19 TW
3.2 Sv 123 TW
Hansen et al. (2003)
Turrell et al. (2003)
0.75 Sv 10 of the total transport to the
Nordic Seas
19 TW 7 of the total heat transport to the
Nordic Seas
20
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21
Transport associated with AW Transport associated with AW Transport associated with AW Transport associated with AW
Period Transport (Sv) Proportion of AW () Heat transport (TW)
1994-2000 0.75 66 19
1994-1995 0.56 51 14
1997-2000 0.84 68 22
There was 50 more flow of AW and 57 more heat
transport during 1997-2000 than in 1994-1995
probably leading to a greater 0-group during
1997-2000 than in the previous period
22
Drifters deployed on Selvogsbanki in spring 1999
Transit times to Hornbanki section 2-3 months
23
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24
Seasonal variations in transport
  • Amplitude of 0.2 Sv
  • Minimum in February/March
  • Maximum in late spring and summer

1994-2000
1999-2000
25
CONCLUSIONS
  1. The transport of AW within the NIIC is 0.75 Sv
    and the associated heat transport is 19 TW
  2. This is 10 and 7 of the total transport and
    heat transport to the Nordic Seas respectively
  3. A seasonal variation in the transport with an
    amplitude of 0.2 Sv is observed with a minimum
    in February/March a maximum in late spring and
    summer
  4. There is considerable interannual variability in
    the flow
  5. There was 50 more flow during 1997-2000 than in
    1994-1995 which probably lead to a greater
    0-group during 1997-2000 than in the previous
    period
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