Temperature reconstruction based on stable nitrogen and argon isotope measurements on Greenland ice cores ...

• Main Author: Döring, Michael
• Format: Thesis
• Language: unknown
• Published: :unas 2020
• Subjects: 530 Physics; Greenland; Greenland ice cores
• Online Access: https://dx.doi.org/10.48350/197938; https://boris.unibe.ch/197938/

Stable isotopes of the inert gases nitrogen (δ15N) and argon (δ40Ar) measured on ancient air extracted from polar ice cores provides the opportunity to reconstruct past temperature variations. Thereby, the temperature reconstruction is conducted by inverting firn densification and heat diffusion models to fit the δ15N and δ40Ar data. The main focus of this work is to develop automated procedures for solving that inverse problem. Automated fitting procedures have the advantage that manual tuning of parameters is avoided which leads to a better reproducibility and comparability between different studies. Furthermore, the use of automated algorithm saves working hours, which should not be underestimated. Another aim of this thesis is the reconstruction of the Holocene temperature history of Greenland summit using one of the automated methods developed in this study. First, an introduction into the topic is given in Chapter 1 containing a motivation of Holocene climate reconstructions, and an overview about a ...