| dc.description.abstract | Results from hydrographical and halocarbon tracer measurements during an oceanographic expedition
with the Norwegian R/V Johan Hjort to the Norwegian Sea, the Faroe Bank Channel, the Iceland and
the Irminger Basins and the Iceland Sea are presented. Special attention has been given the overflow
waters over the Iceland-Scotland ridge and through the Denmark Strait. While the Denmark Strait
overflow does not mix significantly with surrounding waters during its descent into the Irminger Basin,
the Iceland-Scotland overflow is signiticantly entrained by ambient waters within the Iceland Basin. By
multivariate analysis using Principal Component Analysis (PCA) and Partial Least Square (PLS)
calibration, it can be concluded that the overflow water masses contain onlv minor fractions of the
bottom waters in the Norwegian and the Iceland Seas, respectively, which means about one fourth
Norwegian Sea Deep Water (NSDW) over the Iceland-Faroe ridge, while, over the sill in the Denmark
Strait, the fraction of Iceland Sea Bottom Water (ISBW) is about one third. CFC tracers were used to
assign apparent ages of water masses, showing that the NSDW has an apparent age of about 30 years
and the ISBW has an apparent age of more than 25 years. Through the deepest parts of the Faroe Bank
Channel flows water with an apparent age of about 20 years with an origin at about 1000 m depth in
the Norwegian Sea. Labrador Sea Water (LSW) with an age of around 20 years was found in the
Iceland Basin, while the LSW in the Irminger Basin is significantly younger, two cores were found, one
of an age of 11-12 years underlain by a 6 years younger core. The Northeast Atlantic Bottom Water in
the lceland Basin, which has an Antarctic origin, was observed circulating cyclonically within the
basin. | no_NO |
