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