observed and simulated variability of the north atlantic subpolar gyre helge drange & co g. c....
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Observed and simulated variability of the North Atlantic subpolar gyre
Helge Drange & CoG. C. Rieber Climate Institute, the Nansen Center, Bergen, Norway Bjerknes Centre for Climate Research, Bergen, Norway
Geophysical Institute, University of Bergen, Norway Nansen-Zhu International
Research Centre, Beijing, China
NOClim-cite
d:
Curry & Mauritz
en (2005); H
atun et al. (
2005)
NOClim-re
levant:
Orvik and Skagseth (2005); M
auritzen et a
l. (2006);
Siegismund et al. (
2006)
Essentially Curry & Mauritz
en, Science, 2005
~300.000 hydrogrphic profiles (NISE)
Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
Orv
ik, K
jell
Aril
d; S
kags
eth,
Øys
tein
(20
05),
Hea
t flu
x va
riatio
ns in
the
east
ern
Nor
weg
ian
Atla
ntic
Cur
rent
tow
ard
the
Arc
tic fr
om m
oore
d in
stru
men
ts, 1
995–
2005
. Geo
ph. R
es. L
ett.,
32,
No.
14,
L14
610
10.1
029/
2005
GL0
2348
7
“...The extreme temperature increase of 1 oC appears, however, to be independent of the current strength. A future challenge here will be to reveal
the cause of this extraordinary warming...”
R
I
F
Altimetry
MICOM
SSH EOF
I
I
F
F
R
R
The subpolar gyre influence
(Häkkinen and Rhines, Science, 2004)
RI
A longer term perspective
Observed and simulated salinity anomalies from about 1970 to present
Observed Simulated
Irminger (I) Faroe (F) Rockall (R)
(inverted)
WNAW
ENAW
Fresh Saline
The gyre shape and the Rockall Trough
Important: Relationship valid for temperature also!
EOF1 Wind stress curl (26%) EOF1 Buoyancy flux (19%)
Red: SSH PC1 Black: SLP PC1 Green: PC1 Wind stress Blue: PC1 Buoyancy flux
Volume of LSW in layers 15 and 16 and the GI
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
The dynamics of the N-Atl subpolar gyre is of key importance for the poleward transport of heat and salt
The dynamics of the N-Atl subpolar gyre is largely governed by winter time bouyancy forcing
Decadal-scale coupled atm-ocean mode possible - needs investigation! (coupled model system required)
Current generation of OGCMs is able to complement observations
NOClim has provided important insight into the variability of the (marine) climate of the N-Atl
Summary: