000K  utf8
1100  $c2005
1500  eng
2050  urn:nbn:de:gbv:8-diss-12832
3000  Macrander, Andreas
4000  Variability and prcesses of the Denmark Strait overflow$hChristian-Albrechts-Universität zu Kiel  [Macrander, Andreas]
4030  Kiel$nChristian-Albrechts-Universität zu Kiel
4209  The Atlantic Meridional Overturning Circulation (AMOC) is considered as an important part of the global climate system. The densest component of the AMOC is the Denmark Strait Overflow Water, entering the deep Atlantic across the sill between Greenland and Iceland. Here, four years of overflow measurements in Denmark Strait are analyzed. The data suggest, that the overflow consists of a density driven, hydraulically controlled part, and a barotropic, wind stress forced component. The observed overflow transport reduction of 20% from 1999 (3.7 Sv) to 2003 (3.1 Sv) is likely caused by both a dense water reservoir height decrease in the Iceland Sea, and a reduction of the local wind stress forcing. The interannual fluctuations are consistent with a reduction of the North Atlantic Oscillation (NAO). Interannual temperature variability of 0.5 °C is linked to variable upstream entrainment rates and/or variable percentages of different water masses rather than changes of the individual sources. Further, an anticorrelation with the Faroe Bank Channel Overflow is found, with the total dense water outflow from the Nordic Seas being almost constant at 5.5 Sv from 1999 to 2003.
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-12832$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/diss_mods_00001283
5051  550
5550  Denmark Strait Overflow
5550  hydraulic control
5550  interannual fluctuations
5550  Meridional Overturning Circulation
5550  North Atl
5550  wind stress