3. Wochenbericht FS POSEIDON Reise POS503

Reykjavik - Tórhavn - Tórshavn, 01. – 19. August 201

2. Wochenbericht FS POSEIDON Reise POS503

Reykjavik - Tórhavn - Tórshavn, 01. – 19. August 201

3. Wochenbericht FS POSEIDON Reise POS503

Reykjavik - Tórhavn - Tórshavn, 01. – 19. August 201

1. Wochenbericht FS POSEIDON Reise POS503

Reykjavik - Tórhavn - Tórshavn, 01. – 19. August 201

Present-day manifestation of the Nordic Seas Overflows

Dense Nordic waters enter the North Atlantic through passages in the Greenland-Scotland Ridge at a mean rate of 6 Sv. Subsequent entrainment of ambient water into the sinking plumes downstream of the sills approximately double this flux. Decade-long observations show these fluxes to be stable with no discernible trends. Hydraulic control of the overflows and the buffering effect of the Nordic basins effectively filter out short-term variability of dense water production associated with white noise North Atlantic Oscillation forcing. Simulations with directly forced and coupled atmosphere-ocean models show, under present climate conditions, overflow variability on multi-decadal time scales but no longterm trends

Über den Monsunresponse der Zirkulation im westlichen äquatorialen Indischen Ozean

TIB: RN 3292 (99) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

On simultaneous measurements with rotor, wing and acoustic current meters, moored in shallow water

In two closely spaced moorings in the Kiel Bight, four different current meterstwo rotor current meters (Aanderaa and Vector averaging), an acoustic current meter (designed by Gytre), and a pendulum current meter (designed by Niskin) were moored for 22 days. The Vector averaging current meter (VACM) was used as reference instrument on one mooring with the floatation at 7 m depth. The floatation of the second mooring was at 5 m depth in the first 17 days of the experiment, but in 2.7 m depth in the last 5 days to make their mooring more effected by surface waves. The Niskin wing current meter was most effected by wave-induced mooring motion. The Gytre instrument showed the smallest surface-wave effects. The vector variances of this instrument in 7.4 m depth on the surface-wave effected mooring and those of the VACM in 10 m depth on the reference mooring were about equal