Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021"
Greenland glaciers have three primary seasonal ice flow patterns, or “types:” terminus driven, runoff driven, and runoff adapting. To date, glacier types have been identified by analyzing flow at a single location near the terminus; information at all other locations is discarded. Here, we use princ...
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ftunivbuffalo:oai:ubir.buffalo.edu:10477/84288 2023-07-23T04:19:21+02:00 Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" Poinar, Kristin 2022-08-26 application/mat http://hdl.handle.net/10477/84288 eng eng Poinar, K. (2022, September 8). Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016–2021 [preprint]. Earth ArXiv. https://doi.org/10.31223/X5R93G http://hdl.handle.net/10477/84288 glaciology Greenland remote sensing Dataset 2022 ftunivbuffalo https://doi.org/10.31223/X5R93G 2023-07-02T16:27:08Z Greenland glaciers have three primary seasonal ice flow patterns, or “types:” terminus driven, runoff driven, and runoff adapting. To date, glacier types have been identified by analyzing flow at a single location near the terminus; information at all other locations is discarded. Here, we use principal component (PC) / empirical orthogonal function (EOF) analysis to decompose multi-year time series of glacier speed, combined from three satellite-derived products at four glaciers feeding Sermilik Fjord, Greenland. This improves on single-point methods by yielding temporal patterns (PCs), which allow identification of glacier type, and associated spatial patterns (EOFs), which ensure the result reflects data at all locations on the glacier. We find that the leading mode is uniformly signed over the entire glacier domain, that this mode explains the majority of the variance in speed, and therefore that glacier type can be inferred from the leading PC. We find that Helheim Glacier was terminus-driven, Fenris Glacier and Midgard Glacier were runoff-adapting, and Pourquoi-Pas Glacier was runoff-driven over 2016-2021. Our classification agrees with previous work for Helheim and Midgard Glaciers, but differs at the other two. At all but Fenris Glacier, the leading PC correlates significantly with the speed pattern observed at the single point used in previous analyses. Thus, Fenris Glacier has more complex flow patterns than single-point analysis can capture, and wider spatial analysis techniques such as EOF/PC are required. We suggest that, due to its low computational cost and inclusion in standard analysis packages, EOF/PC analysis should be used for assessing glacier type. Heising-Simons Foundation Dataset glacier Greenland Sermilik UBIR Repository (University at Buffalo Institutional Repository) Greenland Midgard ENVELOPE(7.702,7.702,62.526,62.526) Pourquoi Pas ENVELOPE(135.783,135.783,-66.083,-66.083) Pourquoi Pas Glacier ENVELOPE(135.917,135.917,-66.250,-66.250) Pourquoi Pas? Glacier ENVELOPE(135.917,135.917,-66.250,-66.250) Pourquoi-Pas ENVELOPE(-67.450,-67.450,-67.700,-67.700) Pourquoi-Pas? ENVELOPE(135.750,135.750,-66.200,-66.200) Pourquoi-Pas? Glacier ENVELOPE(135.750,135.750,-66.200,-66.200) |
institution |
Open Polar |
collection |
UBIR Repository (University at Buffalo Institutional Repository) |
op_collection_id |
ftunivbuffalo |
language |
English |
topic |
glaciology Greenland remote sensing |
spellingShingle |
glaciology Greenland remote sensing Poinar, Kristin Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
topic_facet |
glaciology Greenland remote sensing |
description |
Greenland glaciers have three primary seasonal ice flow patterns, or “types:” terminus driven, runoff driven, and runoff adapting. To date, glacier types have been identified by analyzing flow at a single location near the terminus; information at all other locations is discarded. Here, we use principal component (PC) / empirical orthogonal function (EOF) analysis to decompose multi-year time series of glacier speed, combined from three satellite-derived products at four glaciers feeding Sermilik Fjord, Greenland. This improves on single-point methods by yielding temporal patterns (PCs), which allow identification of glacier type, and associated spatial patterns (EOFs), which ensure the result reflects data at all locations on the glacier. We find that the leading mode is uniformly signed over the entire glacier domain, that this mode explains the majority of the variance in speed, and therefore that glacier type can be inferred from the leading PC. We find that Helheim Glacier was terminus-driven, Fenris Glacier and Midgard Glacier were runoff-adapting, and Pourquoi-Pas Glacier was runoff-driven over 2016-2021. Our classification agrees with previous work for Helheim and Midgard Glaciers, but differs at the other two. At all but Fenris Glacier, the leading PC correlates significantly with the speed pattern observed at the single point used in previous analyses. Thus, Fenris Glacier has more complex flow patterns than single-point analysis can capture, and wider spatial analysis techniques such as EOF/PC are required. We suggest that, due to its low computational cost and inclusion in standard analysis packages, EOF/PC analysis should be used for assessing glacier type. Heising-Simons Foundation |
format |
Dataset |
author |
Poinar, Kristin |
author_facet |
Poinar, Kristin |
author_sort |
Poinar, Kristin |
title |
Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
title_short |
Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
title_full |
Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
title_fullStr |
Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
title_full_unstemmed |
Data supporting "Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016-2021" |
title_sort |
data supporting "seasonal flow types of glaciers in sermilik fjord, greenland, over 2016-2021" |
publishDate |
2022 |
url |
http://hdl.handle.net/10477/84288 |
long_lat |
ENVELOPE(7.702,7.702,62.526,62.526) ENVELOPE(135.783,135.783,-66.083,-66.083) ENVELOPE(135.917,135.917,-66.250,-66.250) ENVELOPE(135.917,135.917,-66.250,-66.250) ENVELOPE(-67.450,-67.450,-67.700,-67.700) ENVELOPE(135.750,135.750,-66.200,-66.200) ENVELOPE(135.750,135.750,-66.200,-66.200) |
geographic |
Greenland Midgard Pourquoi Pas Pourquoi Pas Glacier Pourquoi Pas? Glacier Pourquoi-Pas Pourquoi-Pas? Pourquoi-Pas? Glacier |
geographic_facet |
Greenland Midgard Pourquoi Pas Pourquoi Pas Glacier Pourquoi Pas? Glacier Pourquoi-Pas Pourquoi-Pas? Pourquoi-Pas? Glacier |
genre |
glacier Greenland Sermilik |
genre_facet |
glacier Greenland Sermilik |
op_relation |
Poinar, K. (2022, September 8). Seasonal flow types of glaciers in Sermilik Fjord, Greenland, over 2016–2021 [preprint]. Earth ArXiv. https://doi.org/10.31223/X5R93G http://hdl.handle.net/10477/84288 |
op_doi |
https://doi.org/10.31223/X5R93G |
_version_ |
1772182346894671872 |