Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement

Greenland ice cores offer a unique opportunity to investigate the climate system behaviour. The objective of this PhD project is to investigate isotope modelling of present- day conditions and conduct model-data comparison using Greenland ice cores. Thus this thesis investigates how the integration...

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Main Author: Faber, Anne-Katrine
Format: Book
Language:English
Published: The Niels Bohr Institute, Faculty of Science, University of Copenhagen 2016
Subjects:
Online Access:https://curis.ku.dk/portal/da/publications/isotopes-in-greenland-precipitation(96b7ae17-51a9-42a0-b3be-58ba9583736e).html
https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734794305763
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spelling ftcopenhagenunip:oai:pure.atira.dk:publications/96b7ae17-51a9-42a0-b3be-58ba9583736e 2023-05-15T14:59:09+02:00 Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement Faber, Anne-Katrine 2016 https://curis.ku.dk/portal/da/publications/isotopes-in-greenland-precipitation(96b7ae17-51a9-42a0-b3be-58ba9583736e).html https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734794305763 eng eng The Niels Bohr Institute, Faculty of Science, University of Copenhagen info:eu-repo/semantics/closedAccess Faber , A-K 2016 , Isotopes in Greenland Precipitation : Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement . The Niels Bohr Institute, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734794305763 > book 2016 ftcopenhagenunip 2021-09-23T17:52:23Z Greenland ice cores offer a unique opportunity to investigate the climate system behaviour. The objective of this PhD project is to investigate isotope modelling of present- day conditions and conduct model-data comparison using Greenland ice cores. Thus this thesis investigates how the integration of model and data can be used to improve the understanding of climate changes. This is done through analysis of isotope modelling, observations and ice core measurements. This dissertation comprises three projects: (1) Modelling the isotopic response to changes in Arctic sea surface conditions, (2) Constructing a new Greenland database of observations and present-day ice core measurements, and (3) Performance test of isotope-enabled CAM5 for Greenland. The recent decades of rapid Arctic sea ice decline are used as a basis for an observational-based model experiment using the isotope-enabled CAM model 3, isoCAM3. Results show that δ18O of precipitation is sensitive to local changes of sea ice concentration and sea surface conditions. It is found that the distribution of the sea ice cover and sea surface conditions is essential for the spatial distribution of the simulated changes in δ18O over the Arctic Ocean. A comprehensive database is created based on ice core and weather station data from Greenland within the period 1890-2014. Present day annual and seasonal mean values are computed for 326 locations in Greenland. Parameterization of the spatial distribution of temperature and δ18O are used to create the first observational-based gridded map of δ18O of precipitation for Greenland and the first gridded map of Greenland temperature, where ice core borehole temperatures are included. The database and gridded maps create a framework for conducting model-data comparison of isotope-enabled GCMs. The simulation of Greenland isotopes is tested for the isotope-enabled model CAM5. Here the importance of model resolution is investigated. A positive bias of 6-10 ‰ is found for the annual mean δ18O on the central part of the Greenland Ice Sheet. The amplitude of the seasonal cycle of Greenland δ18O is highly dependent on model resolution. This is attributed to a complex interaction of local and large scale processes associated with changes in the intensity and position of large scale atmospheric circulation and synoptic systems in the North Atlantic. Book Arctic Arctic Ocean Greenland Greenland ice cores ice core Ice Sheet North Atlantic Sea ice University of Copenhagen: Research Arctic Arctic Ocean Greenland
institution Open Polar
collection University of Copenhagen: Research
op_collection_id ftcopenhagenunip
language English
description Greenland ice cores offer a unique opportunity to investigate the climate system behaviour. The objective of this PhD project is to investigate isotope modelling of present- day conditions and conduct model-data comparison using Greenland ice cores. Thus this thesis investigates how the integration of model and data can be used to improve the understanding of climate changes. This is done through analysis of isotope modelling, observations and ice core measurements. This dissertation comprises three projects: (1) Modelling the isotopic response to changes in Arctic sea surface conditions, (2) Constructing a new Greenland database of observations and present-day ice core measurements, and (3) Performance test of isotope-enabled CAM5 for Greenland. The recent decades of rapid Arctic sea ice decline are used as a basis for an observational-based model experiment using the isotope-enabled CAM model 3, isoCAM3. Results show that δ18O of precipitation is sensitive to local changes of sea ice concentration and sea surface conditions. It is found that the distribution of the sea ice cover and sea surface conditions is essential for the spatial distribution of the simulated changes in δ18O over the Arctic Ocean. A comprehensive database is created based on ice core and weather station data from Greenland within the period 1890-2014. Present day annual and seasonal mean values are computed for 326 locations in Greenland. Parameterization of the spatial distribution of temperature and δ18O are used to create the first observational-based gridded map of δ18O of precipitation for Greenland and the first gridded map of Greenland temperature, where ice core borehole temperatures are included. The database and gridded maps create a framework for conducting model-data comparison of isotope-enabled GCMs. The simulation of Greenland isotopes is tested for the isotope-enabled model CAM5. Here the importance of model resolution is investigated. A positive bias of 6-10 ‰ is found for the annual mean δ18O on the central part of the Greenland Ice Sheet. The amplitude of the seasonal cycle of Greenland δ18O is highly dependent on model resolution. This is attributed to a complex interaction of local and large scale processes associated with changes in the intensity and position of large scale atmospheric circulation and synoptic systems in the North Atlantic.
format Book
author Faber, Anne-Katrine
spellingShingle Faber, Anne-Katrine
Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
author_facet Faber, Anne-Katrine
author_sort Faber, Anne-Katrine
title Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
title_short Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
title_full Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
title_fullStr Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
title_full_unstemmed Isotopes in Greenland Precipitation:Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement
title_sort isotopes in greenland precipitation:isotope-enabled agcm modelling and a new greenland database of observations and ice core measurement
publisher The Niels Bohr Institute, Faculty of Science, University of Copenhagen
publishDate 2016
url https://curis.ku.dk/portal/da/publications/isotopes-in-greenland-precipitation(96b7ae17-51a9-42a0-b3be-58ba9583736e).html
https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734794305763
geographic Arctic
Arctic Ocean
Greenland
geographic_facet Arctic
Arctic Ocean
Greenland
genre Arctic
Arctic Ocean
Greenland
Greenland ice cores
ice core
Ice Sheet
North Atlantic
Sea ice
genre_facet Arctic
Arctic Ocean
Greenland
Greenland ice cores
ice core
Ice Sheet
North Atlantic
Sea ice
op_source Faber , A-K 2016 , Isotopes in Greenland Precipitation : Isotope-Enabled AGCM Modelling and a New Greenland Database of Observations and Ice Core Measurement . The Niels Bohr Institute, Faculty of Science, University of Copenhagen . < https://soeg.kb.dk/permalink/45KBDK_KGL/fbp0ps/alma99122734794305763 >
op_rights info:eu-repo/semantics/closedAccess
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