000K  utf8
1100  $c2005
1500  ger
2050  urn:nbn:de:gbv:8-diss-13723
3000  Kirch, Anja
4000  Untersuchungen zur Rekonstruktion des Partialdruckes von Kohlendioxid anhand von Coccolithophoridenblüten im Nordatlantik : Biomarker Alkenone und deren Kohlenstoffisotopie$hChristian-Albrechts-Universität zu Kiel  [Kirch, Anja]
4030  Kiel$nChristian-Albrechts-Universität zu Kiel
4209  The dissertation deals with methodological and field studies of alkenones and their carbon isotopes in the North Atlantic (Madeira Basin). The methodological studies focussed on comparison of measurements with gas chromatography with flame ionisation detection and gas chromatography coupled to mass spectrometry. It was possible to separate and detect three C37-, five C38- und five C39-alkenones with a single measurement, even at low concentrations. A goal of the field studies was to determine the original carbon isotope values in alkenones at the time of synthesis during blooms of coccolithophorids. 1)Modifications of this primary delta13C- alkenones-values in the water column were followed up to the sediment traps at 2,000 m and 3,050 m. 2)The values of the underlying sediments were considered. The controversial use of the delta13C-alkenones-values for paleoreconstruction of the partial pressure of carbondioxid was critically examined. Parallel behaviour in the development of temperature and delta13C-alkenones-values were observed for all measured alkenones. Dependencies of different delta13C- alkenones-indices of the temperature were established.
4950  https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-13723$xR$3Volltext$534
4961  https://macau.uni-kiel.de/receive/diss_mods_00001372
5051  550
5550  alkenone
5550  Biomarker
5550  C02
5550  carbon isotopes
5550  coccolithophorid
5550  Coccolithophoridae
5550  delta13C
5550  Enone
5550  Klimaänderung
5550  Kohlendioxid
5550  Kohlenstoffisotop
5550  North Atlantic
5550  Partialdruck
5550  partial pressure of carbondioxid
5550  sediment
5550  sediment trap
5550  surface water
5550  Wasserblüte