Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer
Platelet ice is a sea ice type found near an ice shelf. Platelet crystals, which originate in the water column, rise to the surface and deposit under the sea ice cover in a loose layer forming a subice platelet layer. There they grow in the near-surface supercooled water to become frozen into the ic...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Thesis |
Language: | English |
Published: |
University of Otago
2014
|
Subjects: | |
Online Access: | http://hdl.handle.net/10523/4794 |
id |
ftunivotagoour:oai:ourarchive.otago.ac.nz:10523/4794 |
---|---|
record_format |
openpolar |
spelling |
ftunivotagoour:oai:ourarchive.otago.ac.nz:10523/4794 2023-05-15T13:52:08+02:00 Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer Wongpan, Pat Langhorne, Patricia Sun, Zhifa 2014-04-30T04:47:35Z http://hdl.handle.net/10523/4794 en eng University of Otago http://hdl.handle.net/10523/4794 All items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated. Sea Ice Solid fraction Voronoi dynamics Platelet ice Heat and mass transfer Simulation Antarctica Thesis or Dissertation 2014 ftunivotagoour 2022-05-11T19:16:57Z Platelet ice is a sea ice type found near an ice shelf. Platelet crystals, which originate in the water column, rise to the surface and deposit under the sea ice cover in a loose layer forming a subice platelet layer. There they grow in the near-surface supercooled water to become frozen into the ice cover as incorporated platelet ice. Several Antarctic field campaigns have collected ice cores, measured crystallographic and physical properties and simultaneously recorded oceanographic conditions. However, some in situ measurements are difficult to acquire experimentally, in particular the solid fraction of subice platelet layer which is required in this region to obtain sea-ice thickness from remote-sensing measurements. Voronoi dynamics is a simple but efficient grain growth technique. By integrating this with mechanical stability and heat and mass transfer by diffusion, virtual ice cores are simulated in three dimensions. This model shows topological similarity with incorporated platelet ice from real sea ice cores. The calibrated spatial-temporal distributions of porosity, salinity, temperature and crystallographic c-axes are extracted and compared with the observations. The solid fraction of the subice platelet layer obtained from our simulation due to the local growth of platelet crystals within this layer is 0.22 ± 0.01. In order to account for the flux of new crystals deposited into the sub- ice platelet layer, this must be combined with a packing efficiency of the deposition of platelet crystals 0.06 ± 0.01 (Dempsey et al., 2010). The total solid fraction is 0.28 ± 0.01 which is in good agreement with 0.25 ± 0.06 reported by Gough et al. (2012). Thesis Antarc* Antarctic Antarctica Ice Shelf Sea ice University of Otago: Research Archive (OUR Archive) Antarctic Gough ENVELOPE(159.367,159.367,-81.633,-81.633) |
institution |
Open Polar |
collection |
University of Otago: Research Archive (OUR Archive) |
op_collection_id |
ftunivotagoour |
language |
English |
topic |
Sea Ice Solid fraction Voronoi dynamics Platelet ice Heat and mass transfer Simulation Antarctica |
spellingShingle |
Sea Ice Solid fraction Voronoi dynamics Platelet ice Heat and mass transfer Simulation Antarctica Wongpan, Pat Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
topic_facet |
Sea Ice Solid fraction Voronoi dynamics Platelet ice Heat and mass transfer Simulation Antarctica |
description |
Platelet ice is a sea ice type found near an ice shelf. Platelet crystals, which originate in the water column, rise to the surface and deposit under the sea ice cover in a loose layer forming a subice platelet layer. There they grow in the near-surface supercooled water to become frozen into the ice cover as incorporated platelet ice. Several Antarctic field campaigns have collected ice cores, measured crystallographic and physical properties and simultaneously recorded oceanographic conditions. However, some in situ measurements are difficult to acquire experimentally, in particular the solid fraction of subice platelet layer which is required in this region to obtain sea-ice thickness from remote-sensing measurements. Voronoi dynamics is a simple but efficient grain growth technique. By integrating this with mechanical stability and heat and mass transfer by diffusion, virtual ice cores are simulated in three dimensions. This model shows topological similarity with incorporated platelet ice from real sea ice cores. The calibrated spatial-temporal distributions of porosity, salinity, temperature and crystallographic c-axes are extracted and compared with the observations. The solid fraction of the subice platelet layer obtained from our simulation due to the local growth of platelet crystals within this layer is 0.22 ± 0.01. In order to account for the flux of new crystals deposited into the sub- ice platelet layer, this must be combined with a packing efficiency of the deposition of platelet crystals 0.06 ± 0.01 (Dempsey et al., 2010). The total solid fraction is 0.28 ± 0.01 which is in good agreement with 0.25 ± 0.06 reported by Gough et al. (2012). |
author2 |
Langhorne, Patricia Sun, Zhifa |
format |
Thesis |
author |
Wongpan, Pat |
author_facet |
Wongpan, Pat |
author_sort |
Wongpan, Pat |
title |
Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
title_short |
Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
title_full |
Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
title_fullStr |
Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
title_full_unstemmed |
Voronoi Dynamics Simulation of Platelet Sea Ice Growth with Diffusive Heat and Mass Transfer |
title_sort |
voronoi dynamics simulation of platelet sea ice growth with diffusive heat and mass transfer |
publisher |
University of Otago |
publishDate |
2014 |
url |
http://hdl.handle.net/10523/4794 |
long_lat |
ENVELOPE(159.367,159.367,-81.633,-81.633) |
geographic |
Antarctic Gough |
geographic_facet |
Antarctic Gough |
genre |
Antarc* Antarctic Antarctica Ice Shelf Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Sea ice |
op_relation |
http://hdl.handle.net/10523/4794 |
op_rights |
All items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1766256381685399552 |