the north icelandic jet and its contribution to the ... · 20.06.2013 a. sterl; argo workshop,...
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The North Icelandic Jet and its contribution to the
Denmark Strait overflow water in a high-resolution
ocean model
Carlo Corsaro, Univ. Catania (IT)Andreas Sterl, KNMI (NL)
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1. open-ocean convection in Nordic Seas => overflow
2. via EGC; derived from boundary current
Våge et.al, (2011): large and densest part from NIJ
Mixing (no mass transport) in interior Nordic Seas => NIJ
Sinking (mass transport): NIIC => NIJ
Origin of DSOW
Våge et.al, 2011
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The model● NEMO in ORCA025 config (0.25 deg, but higher in Nordic Seas)● 46 layers● Stand-alone● Sub-surface restoring● 45 years (ERA-40 period)● Here: last 25 years● DFS3 forcing (derived from ERA-40)● Output: 5-day averages● Here: monthly-means
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9 m452 m
EGCRim current
NIJ
NIIC
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Transports
observation model
NIIC 0.75 / 1.5 1.2 – 1.35
NIJ (20ºW) 1.5 ± 0.2 1.2 ± 0.3
DSOW 2.9 – 3.7 3.2 ± 0.7
... are well reproduced by the model
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Atl origin: > 0 C, Norwegian continental slopeArctic origin: < 0 C, interior GIN Sea
Våge et.al, 2011
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Transports along path of NIIC and NIJ
NIIC
― NIJ (σθ > 27.8 kg/m3)
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+0.45 Sv
+ 0.16 Sv
+0.41 Sv
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NIIC● Flows eastward along north coast of Iceland● Depth range 100 – 200 m● Joins Nordic Seas rim current at the NE corner of Iceland● Cools/densifies at surface, but not at depth● Hardly looses mass (0.1 Sv sinking)● No interaction with NIJ (no correlations)
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NIJ● Flows westward along north coast of Iceland● Depth range surface to bottom, but maximum around 400 m● Does not exist east of 14-15 ºW● Increases from 0.1 to 1 Sv● Hardly any densification● Is fed by Nordic Seas rim current● Contributes about 1/3 of DSOW
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Where does DSOW come from?
1. intermediate depth (400 m), western slope
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Where does DSOW come from?
2. deep (534 m), eastern slope
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What feeds the NIJ and where does it go to?
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NIJ at 17.5˚W
NIJ at 20˚W
EGC
NIJ(20˚W)+EGC
DSOW
σθ > 27.8 kg/m3
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Summary
● No interaction between NIIC and NIJ (diff from Våge et al., 2011)
● NIJ is fed by Nordic Seas rim current - kind of loop- water from interior mixed in?
● 1/3 of DSOW from NIJ, other 2/3 from EGC