In Situ Observations of the Thermal Strain Coefficient of Sea Ice
Abstract We conduct observations of sea ice thermal strain using a laser theodolite in situ (0.3–1 km distances) and InSAR remote sensing (1–22 km). We capture the thermal strain relationship of sea ice at geophysical scales never before measured. Net strain was, unexpectedly, observable only in coo...
| 發表在: | Geophysical Research Letters |
|---|---|
| Main Authors: | , , , , |
| 格式: | Article |
| 語言: | 英语 |
| 出版: |
Wiley
2025-04-01
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| 主題: | |
| 在線閱讀: | https://doi.org/10.1029/2024GL111434 |
| _version_ | 1849571144218181632 |
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| author | L. Kaidel C. Polashenski N. Wright E. R. Fedders A. R. Mahoney |
| author_facet | L. Kaidel C. Polashenski N. Wright E. R. Fedders A. R. Mahoney |
| author_sort | L. Kaidel |
| collection | DOAJ |
| container_title | Geophysical Research Letters |
| description | Abstract We conduct observations of sea ice thermal strain using a laser theodolite in situ (0.3–1 km distances) and InSAR remote sensing (1–22 km). We capture the thermal strain relationship of sea ice at geophysical scales never before measured. Net strain was, unexpectedly, observable only in cooling First Year Ice below −11°C and found to be dependent on cumulative, as opposed to net, temperature decrease. Prior work, at smaller scales, shows other behaviors. Analysis in the context of prior work and theory indicates multiple processes driving sea ice thermal strain. Strain is a combination of (a) solid ice matrix expansion/contraction, (b) expansion/contraction due to brine inclusion phase changes, (c) apparent mass exchange of brine from non‐enclaved inclusions, (d) apparent internal void formation, and (e) internal stress state. We hypothesize that differential thermal strain in First Year and Multi‐Year Ice contributes to changing ice strength and deformation rates observed in the Arctic. |
| format | Article |
| id | doaj-art-e09a58cb34a74b6697d18abb9402e05d |
| institution | Directory of Open Access Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| spelling | doaj-art-e09a58cb34a74b6697d18abb9402e05d2025-08-20T02:30:59ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01527n/an/a10.1029/2024GL111434In Situ Observations of the Thermal Strain Coefficient of Sea IceL. Kaidel0C. Polashenski1N. Wright2E. R. Fedders3A. R. Mahoney4Thayer College of Engineering Dartmouth College. Thayer School of Engineering Dartmouth College Hanover NH USAThayer College of Engineering Dartmouth College. Thayer School of Engineering Dartmouth College Hanover NH USAThayer College of Engineering Dartmouth College. Thayer School of Engineering Dartmouth College Hanover NH USAGeophysical Institute University of Alaska Fairbanks Fairbanks AK USAGeophysical Institute University of Alaska Fairbanks Fairbanks AK USAAbstract We conduct observations of sea ice thermal strain using a laser theodolite in situ (0.3–1 km distances) and InSAR remote sensing (1–22 km). We capture the thermal strain relationship of sea ice at geophysical scales never before measured. Net strain was, unexpectedly, observable only in cooling First Year Ice below −11°C and found to be dependent on cumulative, as opposed to net, temperature decrease. Prior work, at smaller scales, shows other behaviors. Analysis in the context of prior work and theory indicates multiple processes driving sea ice thermal strain. Strain is a combination of (a) solid ice matrix expansion/contraction, (b) expansion/contraction due to brine inclusion phase changes, (c) apparent mass exchange of brine from non‐enclaved inclusions, (d) apparent internal void formation, and (e) internal stress state. We hypothesize that differential thermal strain in First Year and Multi‐Year Ice contributes to changing ice strength and deformation rates observed in the Arctic.https://doi.org/10.1029/2024GL111434thermal expansion coefficientin situ sea iceremote sensing |
| spellingShingle | L. Kaidel C. Polashenski N. Wright E. R. Fedders A. R. Mahoney In Situ Observations of the Thermal Strain Coefficient of Sea Ice thermal expansion coefficient in situ sea ice remote sensing |
| title | In Situ Observations of the Thermal Strain Coefficient of Sea Ice |
| title_full | In Situ Observations of the Thermal Strain Coefficient of Sea Ice |
| title_fullStr | In Situ Observations of the Thermal Strain Coefficient of Sea Ice |
| title_full_unstemmed | In Situ Observations of the Thermal Strain Coefficient of Sea Ice |
| title_short | In Situ Observations of the Thermal Strain Coefficient of Sea Ice |
| title_sort | in situ observations of the thermal strain coefficient of sea ice |
| topic | thermal expansion coefficient in situ sea ice remote sensing |
| url | https://doi.org/10.1029/2024GL111434 |
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