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Reanalysis of the Iceland-Faroe inflow Bogi Hansen, Karin Margretha H. Larsen, Hjálmar Hátún and Svein Østerhus NACLIM CT2, Hamburg, January 2015.

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Presentation on theme: "Reanalysis of the Iceland-Faroe inflow Bogi Hansen, Karin Margretha H. Larsen, Hjálmar Hátún and Svein Østerhus NACLIM CT2, Hamburg, January 2015."— Presentation transcript:

1 Reanalysis of the Iceland-Faroe inflow Bogi Hansen, Karin Margretha H. Larsen, Hjálmar Hátún and Svein Østerhus NACLIM CT2, Hamburg, January 2015

2 Iceland-Faroe inflow

3 Old method in situ CTD and ADCP (Hansen et al, 2003)

4 New method Combining Altimetry with CTD and ADCP Isoline (combined thermo and halo) CTD stations Altimetry points ADCPs Velocity profile

5 Average surface velocities Geostrophy Altimetry ADCP

6 The depth of the 4°C isotherm Temperature field is linked to the velocity field (Hátún et al, 2004) EOF analysis of the altimetry SLA – Modes 1 and 2 explain 95% of the variability Tried regression of observed isotherm depth on various combinations of surface velocities and PC1 and PC2 – Between 42 and 65% of variability explained by U k + PC1

7 Calculating transports Total transport: Konstant (to bottom or 500m) AW transport: To bottom or average isoline AW transport: To bottom or simulated isoline

8 AW transport Average transport: 3.9 Sv 12 week avg 1 week avg

9 Simulating the temperature distribution T res : variance mainly associated with thermocline movement T res simulated by multiple regression on: AW temperature and 4°C isotherm depth (N04 – N11) AW temperature and altimetry principal component (N02 – N03)

10 Explained var. Using observed AW tmp and isotherm depth Using simulated AW tmp and isotherm depth

11 Heat transport (relative to 0°C) AW volume transport (Sv) 1 yr avg 3 yr r.avg Increase in Relative Heat Transport ≥ 10%

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


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