1. Atlantic water transports to the Arctic and their impact on sea ice
C. Herbaut, M.-N. Houssais, A.-C. Blaizot and S. Close
LOCEAN, UPMC

2. Atlantic Water pathways in the Arctic
Polyakov et al., 2012

3. Barents Sea
Sea ice extent
Surface circulation

4. Winter Sea Ice Concentration (SSMR - SSM-I)
Northern mode and Eastern mode
SIC standard deviation ( )
Northern Mode
Eastern Mode
Sea ice area
R= 0.38

5. Regression of the SIC on Northern and Eastern modes
Eastern Mode Index
Northern Mode Index

6. ORCA025 Arctic-Atlantic configuration ERA-I forcing (1979-2011)
Lag 0
Wind stress
Sea ice production
Northern Mode
 Northerly winds
Eastern Mode
 Easterly winds

7. Ocean impact on the Northern mode
Climatology
Correlation BSO heat transport on Northern Mode
Regression on the Northern mode
Lag 0
Ouflow
Inflow
Net

8. Reemergence of the AW temperature anomalies
Regression of temperature at 110 meters
on the northern mode at lag -1 year
Lag -1 year
Correlation BSO heat content on Northern Mode
Ocean heat content
Divergence of heat transport
Surface heat flux

9. Regression of winter SLP
Impact of the SST anomalies on the atmosphere (and SIC) ?
Regression of winter SLP
on October SST
Regression of OND SST
on the Northern Mode

10. Atlantic Water pathways in the Arctic

11. Fram Strait Temperature Observations Model Fram Strait Longitude

12. Atlantic Water proprerties in Fram Strait in winter (JFM)
Eof1 temperature 38%
Eof1 Velocity 34%
Eof1 heat transport 48%
PC1s
Temperature
Velocity
Heat transport
Correlation:
Velocity – Heat transport = 0.88
Temperature - Heat transport = 0.50

13. Atlantic Water circulation
Regression on PC1 of velocity at Fram Strait
Currents at 230 meters JFM
SLP DJF
Cyclonic circulation over the Nordic Seas + Arctic Ocean
Arctic Oscillation

14. localized circulation in the Barents Sea
Regression the current at 230 meters on PC2 of velocity in the WSC
localized circulation in the Barents Sea

15. Atlantic Water temperature (230 m)
Regression on PC1 of temperature in Fram Strait
Lag -1 year
Lag 0
Temperature anomalies over the Barents Sea + Fram Strait Branch

16. Constant passive tracer sources : BSO Fram Strait (0-800 m)
Distribution of passive tracers at 230 meters
Fram Strait Branch
Barents Sea Branch
2008

17. Variability of the Atlantic Water
Interannual variability at Kola Section
Model
Observations
Seasonal variability if the fram Strait Branch
North of Svalbard
off Laptev Sea

18. Vertical distribution of passive tracers and temperature
Fram Strait Branch
Barents Sea Branch
Off Laptev Sea
2008
Core of the FSB tracer coïncides with the temperature maximum
Maximum of the BSB tracer along the coast

19. Propagation of two strong warming events
Hovmoeller of Temperature along the slope of the Eurasien Basin
Propagation of two strong warming events
Strong decrease of temperature and tracer east of St Anna Trough

20. West of St Anna Trough
Off Laptev Sea
FSB Tracer
BSB Tracer
Temperature
Correlation: 0.78
Correlation: -0.78
Correlation: 0.48
Variability of the temperature in the core of the Atlantic branch linked with
the variability of the exchange between the Barents and Fram Strait Branches.

21. Impact of the temperature variability in the FSB on sea ice properties
Climatological sea ice melt
in winter (cm/d)
Regression of the sea ice melt
in winter on PC1 of T in Fram Strait
Hints of influence north of the Barents Sea

22. Next
Analyse the covariability of the AW branches in FS and BS
Diagnose ocean vertical heat fluxes and their impact on sea ice
Analyse the atmospheric modes linked to sea ice/SST variability
Other seasons …

23. The research leading to these results has received funding from the European Union 7th Framework Programme (FP ), under grant agreement n NACLIM