Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics
The state of the sea ice cover results from an interplay between thermodynamics and dynamics. Changes in the ice cover further affect the way in which the ice responds to forcing, both thermodynamic and dynamic. This thesis discusses several aspects of sea ice thermodynamics and dynamics, and their...
Main Author: | |
---|---|
Other Authors: | , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Helsingin yliopisto
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/10138/225271 |
id |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/225271 |
---|---|
record_format |
openpolar |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/225271 2023-08-20T04:04:27+02:00 Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics Oikkonen, Annu Weiss, Jerome University of Helsinki, Faculty of Science, Department of Physics Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Haapala, Jari Leppäranta, Matti Lensu, Mikko 2017-10-10T11:27:26Z application/pdf http://hdl.handle.net/10138/225271 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-336-034-1 0782-6117 http://hdl.handle.net/10138/225271 URN:ISBN:978-952-336-035-8 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2017 ftunivhelsihelda 2023-07-28T06:19:14Z The state of the sea ice cover results from an interplay between thermodynamics and dynamics. Changes in the ice cover further affect the way in which the ice responds to forcing, both thermodynamic and dynamic. This thesis discusses several aspects of sea ice thermodynamics and dynamics, and their contribution to the evolution of ice pack, and particularly to changes in the Arctic sea ice cover. The main focus is on the ice dynamics in different types of ice zones and under different conditions, which also enables the examination of the impact of thermodynamic forcing on sea ice dynamics. Changes in the Arctic sea ice thickness distribution during the period 1975-2000 are studied in detail, and the contribution of thermodynamics and dynamics as driving forcing is discussed. The results show that the shape of the sea ice thickness distribution has changed: the peak of the distribution has generally narrowed and shifted towards thinner ice. A prevalent feature is the loss of thick, mostly deformed ice, which has had a significant role in the decrease in the mean and modal ice thickness. The results also show a decrease in the seasonal variability of the mean ice thickness, but with strong regional differences. Also, the regional variability of the sea ice thickness has decreased, since the thinning has been the most pronounced in regions which formerly had the thickest ice cover. The observed changes in the regional ice draft distributions cannot be explained by local warming of the atmosphere, but changes in the ice drift patterns have had an essential impact. These results emphasize the importance of the description of sea ice dynamics in the models. Sea ice dynamics, and especially deformation, strongly affect the evolution of ice volume and properties of ice cover. There has still been a need for better understanding of the highly local and intermittent deformation process, as well as its variability that rises from different types of conditions and regions. Several aspects of these questions are covered in ... Doctoral or Postdoctoral Thesis Arctic ice pack Sea ice Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
description |
The state of the sea ice cover results from an interplay between thermodynamics and dynamics. Changes in the ice cover further affect the way in which the ice responds to forcing, both thermodynamic and dynamic. This thesis discusses several aspects of sea ice thermodynamics and dynamics, and their contribution to the evolution of ice pack, and particularly to changes in the Arctic sea ice cover. The main focus is on the ice dynamics in different types of ice zones and under different conditions, which also enables the examination of the impact of thermodynamic forcing on sea ice dynamics. Changes in the Arctic sea ice thickness distribution during the period 1975-2000 are studied in detail, and the contribution of thermodynamics and dynamics as driving forcing is discussed. The results show that the shape of the sea ice thickness distribution has changed: the peak of the distribution has generally narrowed and shifted towards thinner ice. A prevalent feature is the loss of thick, mostly deformed ice, which has had a significant role in the decrease in the mean and modal ice thickness. The results also show a decrease in the seasonal variability of the mean ice thickness, but with strong regional differences. Also, the regional variability of the sea ice thickness has decreased, since the thinning has been the most pronounced in regions which formerly had the thickest ice cover. The observed changes in the regional ice draft distributions cannot be explained by local warming of the atmosphere, but changes in the ice drift patterns have had an essential impact. These results emphasize the importance of the description of sea ice dynamics in the models. Sea ice dynamics, and especially deformation, strongly affect the evolution of ice volume and properties of ice cover. There has still been a need for better understanding of the highly local and intermittent deformation process, as well as its variability that rises from different types of conditions and regions. Several aspects of these questions are covered in ... |
author2 |
Weiss, Jerome University of Helsinki, Faculty of Science, Department of Physics Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Haapala, Jari Leppäranta, Matti Lensu, Mikko |
format |
Doctoral or Postdoctoral Thesis |
author |
Oikkonen, Annu |
spellingShingle |
Oikkonen, Annu Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
author_facet |
Oikkonen, Annu |
author_sort |
Oikkonen, Annu |
title |
Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
title_short |
Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
title_full |
Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
title_fullStr |
Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
title_full_unstemmed |
Evolution of sea ice cover : Result of interplay between dynamics and thermodynamics |
title_sort |
evolution of sea ice cover : result of interplay between dynamics and thermodynamics |
publisher |
Helsingin yliopisto |
publishDate |
2017 |
url |
http://hdl.handle.net/10138/225271 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic ice pack Sea ice |
genre_facet |
Arctic ice pack Sea ice |
op_relation |
URN:ISBN:978-952-336-034-1 0782-6117 http://hdl.handle.net/10138/225271 URN:ISBN:978-952-336-035-8 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1774714827220975616 |