Direkt zum Inhalt
  1. Publizieren |
  2. Suche |
  3. Browsen |
  4. Neuzugänge rss |
  5. Open Access |
  6. Rechtsfragen |
  7. EnglishCookie löschen - von nun an wird die Spracheinstellung Ihres Browsers verwendet.

The principles of growth and isotopic fractionation of stalagmites : A numerical model to reconstruct temperature and precipitation records from stalagmites grown under disequilibrium conditions

Mühlinghaus, Christian

Deutsche Übersetzung des Titels: Grundlagen des Wachstums und der isotopischen Fraktionierung von Stalagmiten : Ein numerisches Modell zur Rekonstruktion von Temperatur und Niederschlag anhand von Stalagmiten

[thumbnail of Muehlinghaus_PhD_Thesis.pdf]
Vorschau
PDF, Englisch
Download (4MB) | Nutzungsbedingungen

Zitieren von Dokumenten: Bitte verwenden Sie für Zitate nicht die URL in der Adresszeile Ihres Webbrowsers, sondern entweder die angegebene DOI, URN oder die persistente URL, deren langfristige Verfügbarkeit wir garantieren. [mehr ...]

Abstract

Speleothems and stalagmites in particular are frequently used as archives of paleoclimate. Their growth, isotopic carbon and oxygen profiles and the possibility of an exact dating provide time series in a high temporal resolution. However, the interpretation of these profiles is difficult since the isotopic signal in stalagmites underlies several influences outside and inside the cave. In this study the basic principles of stalagmite growth and isotopic enrichment under equilibrium and disequilibrium conditions in dependence on climate related parameters are described quantitatively using numerical models. In a final step these basics are used to develop a combined model, which enables the reconstruction of temperature and drip interval records from isotopic profiles of kinetically grown stalagmites. In contrast to former models, which have been limited in their application to samples developed under equilibrium conditions, this model is able to cope with kinetically grown samples and hence extends the number of stalagmites, which might be investigated. Furthermore the model exceeds the results of former models by yielding drip intervals in addition to temperature records. The model is applied to two stalagmites from Southern Chile and reveals first temperature and drip interval records obtained by stalagmites from extremely low latitudes. The study was carried out in the framework of the daphne Forschergruppe in Heidelberg.

Übersetzung des Abstracts (Englisch)

Speleothems and stalagmites in particular are frequently used as archives of paleoclimate. Their growth, isotopic carbon and oxygen profiles and the possibility of an exact dating provide time series in a high temporal resolution. However, the interpretation of these profiles is difficult since the isotopic signal in stalagmites underlies several influences outside and inside the cave. In this study the basic principles of stalagmite growth and isotopic enrichment under equilibrium and disequilibrium conditions in dependence on climate related parameters are described quantitatively using numerical models. In a final step these basics are used to develop a combined model, which enables the reconstruction of temperature and drip interval records from isotopic profiles of kinetically grown stalagmites. In contrast to former models, which have been limited in their application to samples developed under equilibrium conditions, this model is able to cope with kinetically grown samples and hence extends the number of stalagmites, which might be investigated. Furthermore the model exceeds the results of former models by yielding drip intervals in addition to temperature records. The model is applied to two stalagmites from Southern Chile and reveals first temperature and drip interval records obtained by stalagmites from extremely low latitudes. The study was carried out in the framework of the daphne Forschergruppe in Heidelberg.

Dokumententyp: Dissertation
Erstgutachter: Mangini, Prof. Augusto
Tag der Prüfung: 2 Juli 2008
Erstellungsdatum: 05 Aug. 2008 11:27
Erscheinungsjahr: 2008
Institute/Einrichtungen: Zentrale und Sonstige Einrichtungen > Heidelberger Akademie der Wissenschaften
DDC-Sachgruppe: 530 Physik
Normierte Schlagwörter: Paläoklima, Stalagmit, Rekonstruktion
Freie Schlagwörter: paleoclimate , stalagmite , reconstruction
Leitlinien | Häufige Fragen | Kontakt | Impressum |
OA-LogoDINI-Zertifikat 2013Logo der Open-Archives-Initiative