Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition
Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic firstyear sea-ice ridge, from its formation to advanced melt. Initially the mean keel dep...
Published in: | Elem Sci Anth |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
University of California Press
2023
|
Subjects: | |
Online Access: | https://hdl.handle.net/10037/29890 https://doi.org/10.1525/elementa.2023.00008 |
id |
ftunivtroemsoe:oai:munin.uit.no:10037/29890 |
---|---|
record_format |
openpolar |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/29890 2023-09-05T13:15:48+02:00 Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition Salganik, Evgenii Lange, Benjamin Itkin, Polona Divine, Dmitry Katlein, Christian Nicolaus, Marcel Hoppmann, Mario Neckel, Niklas Ricker, Robert Høyland, Knut Vilhelm Granskog, Mats 2023-06-22 https://hdl.handle.net/10037/29890 https://doi.org/10.1525/elementa.2023.00008 eng eng University of California Press Elementa: Science of the Anthropocene Salganik, Lange, Itkin, Divine, Katlein, Nicolaus, Hoppmann, Neckel, Ricker, Høyland, Granskog. Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition. Elementa: Science of the Anthropocene. 2023;11(1) FRIDAID 2157529 doi:10.1525/elementa.2023.00008 2325-1026 https://hdl.handle.net/10037/29890 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Other geosciences: 469 Arktis / Arctic Polhavet / Arctic ocean Sjøis / Sea ice Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.1525/elementa.2023.00008 2023-08-16T23:06:45Z Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic firstyear sea-ice ridge, from its formation to advanced melt. Initially the mean keel depth was 5.6 m and mean sail height was 0.7 m. The initial rubble macroporosity (fraction of seawater filled voids) was estimated at 29% from ice drilling and 43%–46% from buoy temperature. From January until mid-April, the ridge consolidated slowly by heat loss to the atmosphere and the total consolidated layer growth during this phase was 0.7 m. From mid-April to mid-June, there was a sudden increase of ridge consolidation rate despite no increase in conductive heat flux. We surmise this change was related to decreased macroporosity due to transport of snow-slush to the ridge keel rubble via adjacent open leads. In this period, the mean thickness of the consolidated layer increased by 2.1 m. At the peak of melt in June–July we suggest that the consolidation was related to the refreezing of surface snow and ice meltwater and of ridge keel meltwater (the latter only about 15% of total consolidation). We used the morphology parameters of the ridge to calculate its hydrostatic equilibrium and obtained a more accurate estimate of the actual consolidation of the keel, correcting from 2.2 m to 2.8 m for average keel consolidation. This approach also allowed us to estimate that the average keel melt of 0.3 m, in June–July, was accompanied by a decrease in ridge draft of 0.9 m. An ice mass balance buoy in the ridge indicated total consolidation of 2.8 m, of which 2.1 m was related to the rapid mode of consolidation from April to June. By mid-June, consolidation resulted in a drastic decrease of the macroporosity of the interior of keel while the flanks had little or no change in macroporosity. These results are important to understanding the role of ridge keels as meltwater sources and sinks and as sanctuary for ice-associated ... Article in Journal/Newspaper Arctic Arctic Arctic Ocean Arktis Arktis* Polhav* Polhavet Sea ice University of Tromsø: Munin Open Research Archive Arctic Arctic Ocean Elem Sci Anth 11 1 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Other geosciences: 469 Arktis / Arctic Polhavet / Arctic ocean Sjøis / Sea ice |
spellingShingle |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Other geosciences: 469 Arktis / Arctic Polhavet / Arctic ocean Sjøis / Sea ice Salganik, Evgenii Lange, Benjamin Itkin, Polona Divine, Dmitry Katlein, Christian Nicolaus, Marcel Hoppmann, Mario Neckel, Niklas Ricker, Robert Høyland, Knut Vilhelm Granskog, Mats Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
topic_facet |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Andre geofag: 469 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Other geosciences: 469 Arktis / Arctic Polhavet / Arctic ocean Sjøis / Sea ice |
description |
Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic firstyear sea-ice ridge, from its formation to advanced melt. Initially the mean keel depth was 5.6 m and mean sail height was 0.7 m. The initial rubble macroporosity (fraction of seawater filled voids) was estimated at 29% from ice drilling and 43%–46% from buoy temperature. From January until mid-April, the ridge consolidated slowly by heat loss to the atmosphere and the total consolidated layer growth during this phase was 0.7 m. From mid-April to mid-June, there was a sudden increase of ridge consolidation rate despite no increase in conductive heat flux. We surmise this change was related to decreased macroporosity due to transport of snow-slush to the ridge keel rubble via adjacent open leads. In this period, the mean thickness of the consolidated layer increased by 2.1 m. At the peak of melt in June–July we suggest that the consolidation was related to the refreezing of surface snow and ice meltwater and of ridge keel meltwater (the latter only about 15% of total consolidation). We used the morphology parameters of the ridge to calculate its hydrostatic equilibrium and obtained a more accurate estimate of the actual consolidation of the keel, correcting from 2.2 m to 2.8 m for average keel consolidation. This approach also allowed us to estimate that the average keel melt of 0.3 m, in June–July, was accompanied by a decrease in ridge draft of 0.9 m. An ice mass balance buoy in the ridge indicated total consolidation of 2.8 m, of which 2.1 m was related to the rapid mode of consolidation from April to June. By mid-June, consolidation resulted in a drastic decrease of the macroporosity of the interior of keel while the flanks had little or no change in macroporosity. These results are important to understanding the role of ridge keels as meltwater sources and sinks and as sanctuary for ice-associated ... |
format |
Article in Journal/Newspaper |
author |
Salganik, Evgenii Lange, Benjamin Itkin, Polona Divine, Dmitry Katlein, Christian Nicolaus, Marcel Hoppmann, Mario Neckel, Niklas Ricker, Robert Høyland, Knut Vilhelm Granskog, Mats |
author_facet |
Salganik, Evgenii Lange, Benjamin Itkin, Polona Divine, Dmitry Katlein, Christian Nicolaus, Marcel Hoppmann, Mario Neckel, Niklas Ricker, Robert Høyland, Knut Vilhelm Granskog, Mats |
author_sort |
Salganik, Evgenii |
title |
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
title_short |
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
title_full |
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
title_fullStr |
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
title_full_unstemmed |
Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition |
title_sort |
different mechanisms of arctic first-year sea-ice ridge consolidation observed during the mosaic expedition |
publisher |
University of California Press |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/29890 https://doi.org/10.1525/elementa.2023.00008 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Arktis Arktis* Polhav* Polhavet Sea ice |
genre_facet |
Arctic Arctic Arctic Ocean Arktis Arktis* Polhav* Polhavet Sea ice |
op_relation |
Elementa: Science of the Anthropocene Salganik, Lange, Itkin, Divine, Katlein, Nicolaus, Hoppmann, Neckel, Ricker, Høyland, Granskog. Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition. Elementa: Science of the Anthropocene. 2023;11(1) FRIDAID 2157529 doi:10.1525/elementa.2023.00008 2325-1026 https://hdl.handle.net/10037/29890 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.1525/elementa.2023.00008 |
container_title |
Elem Sci Anth |
container_volume |
11 |
container_issue |
1 |
_version_ |
1776197615559376896 |