The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022
Constraining the onset of dynamic recrystallization and its effects on the mechanical properties of firn is crucial for modeling the firn densification process. To that end, experiments have been conducted on firn samples from 13 meter (m) depth in a Greenland firn core. Changes in the microstructur...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
Arctic Data Center
2023
|
Subjects: | |
Online Access: | https://search.dataone.org/view/urn:uuid:a3ace79a-9589-4feb-923d-e0a3d840bca9 |
id |
dataone:urn:uuid:a3ace79a-9589-4feb-923d-e0a3d840bca9 |
---|---|
record_format |
openpolar |
spelling |
dataone:urn:uuid:a3ace79a-9589-4feb-923d-e0a3d840bca9 2024-06-03T18:46:52+00:00 The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 Ayobami Ogunmolasuyi Andrii Murdza Ian Baker Summit, Greenland ENVELOPE(-38.416,-38.416,72.583,72.583) BEGINDATE: 2017-01-01T00:00:00Z ENDDATE: 2017-01-01T00:00:00Z 2023-01-01T00:00:00Z https://search.dataone.org/view/urn:uuid:a3ace79a-9589-4feb-923d-e0a3d840bca9 unknown Arctic Data Center Firn Densification Recrystallization Microstructural Evolution Rheology Dataset 2023 dataone:urn:node:ARCTIC 2024-06-03T18:20:08Z Constraining the onset of dynamic recrystallization and its effects on the mechanical properties of firn is crucial for modeling the firn densification process. To that end, experiments have been conducted on firn samples from 13 meter (m) depth in a Greenland firn core. Changes in the microstructural parameters were examined using a combination of polarized optical examination of thin sections and micro-computed tomography (micro-CT) of bulk samples. The mean grain diameter decreases rapidly at the early stage of deformation and levels off as the strain levels increase, while the grain area distribution indicates an increase in the frequency of smaller grains as the strain increases. Analyses of micro-CT reconstructions show an increase in density, due to a decrease in porosity and specific surface area. The results show that dynamic recrystallization occurs in firn under creep, with its onset occurring at a strain of ~12%. The recrystallization leads to both a reduction in grain size and a change in the fabric, indicating that recrystallization occurs by nucleation and growth. Dataset Greenland Arctic Data Center (via DataONE) Greenland ENVELOPE(-38.416,-38.416,72.583,72.583) |
institution |
Open Polar |
collection |
Arctic Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:ARCTIC |
language |
unknown |
topic |
Firn Densification Recrystallization Microstructural Evolution Rheology |
spellingShingle |
Firn Densification Recrystallization Microstructural Evolution Rheology Ayobami Ogunmolasuyi Andrii Murdza Ian Baker The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
topic_facet |
Firn Densification Recrystallization Microstructural Evolution Rheology |
description |
Constraining the onset of dynamic recrystallization and its effects on the mechanical properties of firn is crucial for modeling the firn densification process. To that end, experiments have been conducted on firn samples from 13 meter (m) depth in a Greenland firn core. Changes in the microstructural parameters were examined using a combination of polarized optical examination of thin sections and micro-computed tomography (micro-CT) of bulk samples. The mean grain diameter decreases rapidly at the early stage of deformation and levels off as the strain levels increase, while the grain area distribution indicates an increase in the frequency of smaller grains as the strain increases. Analyses of micro-CT reconstructions show an increase in density, due to a decrease in porosity and specific surface area. The results show that dynamic recrystallization occurs in firn under creep, with its onset occurring at a strain of ~12%. The recrystallization leads to both a reduction in grain size and a change in the fabric, indicating that recrystallization occurs by nucleation and growth. |
format |
Dataset |
author |
Ayobami Ogunmolasuyi Andrii Murdza Ian Baker |
author_facet |
Ayobami Ogunmolasuyi Andrii Murdza Ian Baker |
author_sort |
Ayobami Ogunmolasuyi |
title |
The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
title_short |
The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
title_full |
The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
title_fullStr |
The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
title_full_unstemmed |
The Onset of Recrystallization in Polar Firn, Summit, Greenland, 2022 |
title_sort |
onset of recrystallization in polar firn, summit, greenland, 2022 |
publisher |
Arctic Data Center |
publishDate |
2023 |
url |
https://search.dataone.org/view/urn:uuid:a3ace79a-9589-4feb-923d-e0a3d840bca9 |
op_coverage |
Summit, Greenland ENVELOPE(-38.416,-38.416,72.583,72.583) BEGINDATE: 2017-01-01T00:00:00Z ENDDATE: 2017-01-01T00:00:00Z |
long_lat |
ENVELOPE(-38.416,-38.416,72.583,72.583) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
_version_ |
1800872234104913920 |