DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip
The increasing mass loss from the Greenland ice sheet is becoming growingly important to present-day global sea level rise. Meltwater export to the ocean may be amplified by near-surface ice layers in firn (i.e., snow that has survived at least one melt season) which prevent infiltration. Such ice l...
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Online Access: | https://doi.org/10.3389/feart.2022.938246.s001 https://figshare.com/articles/dataset/DataSheet1_Local-scale_spatial_variability_in_firn_properties_in_Southwest_Greenland_zip/21376815 |
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ftfrontimediafig:oai:figshare.com:article/21376815 2024-09-09T19:42:56+00:00 DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip Jing Xiao Åsa K. Rennermalm Federico Covi Regine Hock Sasha Z. Leidman Clément Miège Michael J. MacFerrin Samira Samimi 2022-10-21T04:27:24Z https://doi.org/10.3389/feart.2022.938246.s001 https://figshare.com/articles/dataset/DataSheet1_Local-scale_spatial_variability_in_firn_properties_in_Southwest_Greenland_zip/21376815 unknown doi:10.3389/feart.2022.938246.s001 https://figshare.com/articles/dataset/DataSheet1_Local-scale_spatial_variability_in_firn_properties_in_Southwest_Greenland_zip/21376815 CC BY 4.0 Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice and climate ice core ice-sheet mass balance polar firn Greenland local-scale variability Dataset 2022 ftfrontimediafig https://doi.org/10.3389/feart.2022.938246.s001 2024-08-19T06:19:50Z The increasing mass loss from the Greenland ice sheet is becoming growingly important to present-day global sea level rise. Meltwater export to the ocean may be amplified by near-surface ice layers in firn (i.e., snow that has survived at least one melt season) which prevent infiltration. Such ice layers have been documented at various sites in southwest Greenland, but little is known about the local-scale (less than 1 km) variability in firn and ice properties. Here we investigate the local variability in firn density and ice content (ice layer thickness fraction) by analyzing 45 shallow firn cores retrieved from 15 sites in southwest Greenland between 2012 and 2019. The core dataset contains groups of cores that were collected at the same site (1–632 m apart from each other) and in the same year (here referred to as same site/year cores). The two-sided Mann-Whitney U-tests suggest that most same site/year cores do not have statistically significant differences in median density or ice content over the upper 0–4.5, 4.5–9, and 9–13.5 m sections below the winter snow layer. That said, the same site/year cores still exhibit substantial density and ice content differences as well as variable ice layer stratigraphy (especially the distribution of centimeters-thick ice lenses) not explainable by measurement uncertainties. The local-scale variability in density and ice content (calculated from the same site/year cores) over the three 4.5-m sections is 4% and 19–29%, respectively. The variability is comparable to the regional gradient in our study area within an elevation difference of up to ∼200 m. The local variability is non-negligible particularly at mid- to high-elevation sites (>2,000 m a.s.l.), where firn structure changes such as ice layer formation are more recent phenomena compared to lower elevations. This study confirms that single cores can provide representative bulk statistics such as mean density and ice content of one site. However, these mean values mask substantial local variability which can ... Dataset Greenland ice core Ice Sheet Frontiers: Figshare Greenland |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice and climate ice core ice-sheet mass balance polar firn Greenland local-scale variability |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice and climate ice core ice-sheet mass balance polar firn Greenland local-scale variability Jing Xiao Åsa K. Rennermalm Federico Covi Regine Hock Sasha Z. Leidman Clément Miège Michael J. MacFerrin Samira Samimi DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice and climate ice core ice-sheet mass balance polar firn Greenland local-scale variability |
description |
The increasing mass loss from the Greenland ice sheet is becoming growingly important to present-day global sea level rise. Meltwater export to the ocean may be amplified by near-surface ice layers in firn (i.e., snow that has survived at least one melt season) which prevent infiltration. Such ice layers have been documented at various sites in southwest Greenland, but little is known about the local-scale (less than 1 km) variability in firn and ice properties. Here we investigate the local variability in firn density and ice content (ice layer thickness fraction) by analyzing 45 shallow firn cores retrieved from 15 sites in southwest Greenland between 2012 and 2019. The core dataset contains groups of cores that were collected at the same site (1–632 m apart from each other) and in the same year (here referred to as same site/year cores). The two-sided Mann-Whitney U-tests suggest that most same site/year cores do not have statistically significant differences in median density or ice content over the upper 0–4.5, 4.5–9, and 9–13.5 m sections below the winter snow layer. That said, the same site/year cores still exhibit substantial density and ice content differences as well as variable ice layer stratigraphy (especially the distribution of centimeters-thick ice lenses) not explainable by measurement uncertainties. The local-scale variability in density and ice content (calculated from the same site/year cores) over the three 4.5-m sections is 4% and 19–29%, respectively. The variability is comparable to the regional gradient in our study area within an elevation difference of up to ∼200 m. The local variability is non-negligible particularly at mid- to high-elevation sites (>2,000 m a.s.l.), where firn structure changes such as ice layer formation are more recent phenomena compared to lower elevations. This study confirms that single cores can provide representative bulk statistics such as mean density and ice content of one site. However, these mean values mask substantial local variability which can ... |
format |
Dataset |
author |
Jing Xiao Åsa K. Rennermalm Federico Covi Regine Hock Sasha Z. Leidman Clément Miège Michael J. MacFerrin Samira Samimi |
author_facet |
Jing Xiao Åsa K. Rennermalm Federico Covi Regine Hock Sasha Z. Leidman Clément Miège Michael J. MacFerrin Samira Samimi |
author_sort |
Jing Xiao |
title |
DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
title_short |
DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
title_full |
DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
title_fullStr |
DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
title_full_unstemmed |
DataSheet1_Local-scale spatial variability in firn properties in Southwest Greenland.zip |
title_sort |
datasheet1_local-scale spatial variability in firn properties in southwest greenland.zip |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.938246.s001 https://figshare.com/articles/dataset/DataSheet1_Local-scale_spatial_variability_in_firn_properties_in_Southwest_Greenland_zip/21376815 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet |
genre_facet |
Greenland ice core Ice Sheet |
op_relation |
doi:10.3389/feart.2022.938246.s001 https://figshare.com/articles/dataset/DataSheet1_Local-scale_spatial_variability_in_firn_properties_in_Southwest_Greenland_zip/21376815 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/feart.2022.938246.s001 |
_version_ |
1809912247945789440 |