Dynamic time warping to quantify age distortion in firn cores impacted by melt processes
As warming intensifies across the Greenland ice sheet, an increasing number of shallow coring and radar studies are targeting the melt-impacted firn column to investigate meltwater processes. Highly inhomogeneous infiltration and refreezing, however, redistributes mass, distorting age–depth relation...
Published in: | Annals of Glaciology |
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Online Access: | https://doi.org/10.1017/aog.2023.52 https://doaj.org/article/b50b5c3addc640e6a0a696eb0c820169 |
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ftdoajarticles:oai:doaj.org/article:b50b5c3addc640e6a0a696eb0c820169 2023-09-05T13:12:03+02:00 Dynamic time warping to quantify age distortion in firn cores impacted by melt processes Cedric J. Hagen Joel T. Harper https://doi.org/10.1017/aog.2023.52 https://doaj.org/article/b50b5c3addc640e6a0a696eb0c820169 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305523000526/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2023.52 0260-3055 1727-5644 https://doaj.org/article/b50b5c3addc640e6a0a696eb0c820169 Annals of Glaciology, Pp 1-9 Ice and climate melt – surface polar firn Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/aog.2023.52 2023-08-20T00:34:37Z As warming intensifies across the Greenland ice sheet, an increasing number of shallow coring and radar studies are targeting the melt-impacted firn column to investigate meltwater processes. Highly inhomogeneous infiltration and refreezing, however, redistributes mass, distorting age–depth relationships and confounding comparisons between different cores. Here, we utilize a dynamic time warping algorithm for time series alignment to investigate and quantify the heterogeneous impact of melt processes on nine closely spaced (within 50 m) firn core-density profiles. The 10 m cores were collected relatively high in Greenland's percolation zone, where melt alteration is minimal compared to lower elevation. Our analysis demonstrates the effectiveness of dynamic time warping as a tool for assessing heterogeneity between ice core records. We find that the optimal alignment of density profiles in the nine cores requires vertical stretching and compression of individual profiles, ranging from, on average, <1 to ~16% of the core lengths. We identified four depth zones of mass redistribution that appear to coincide with observed ice layers. Further, ~75% of density measurements from each core do not align with an age model-derived density profile that assumes no mass redistribution of meltwater, indicating the pervasive impact of melt processes. Article in Journal/Newspaper Annals of Glaciology Greenland ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Annals of Glaciology 1 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice and climate melt – surface polar firn Meteorology. Climatology QC851-999 |
spellingShingle |
Ice and climate melt – surface polar firn Meteorology. Climatology QC851-999 Cedric J. Hagen Joel T. Harper Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
topic_facet |
Ice and climate melt – surface polar firn Meteorology. Climatology QC851-999 |
description |
As warming intensifies across the Greenland ice sheet, an increasing number of shallow coring and radar studies are targeting the melt-impacted firn column to investigate meltwater processes. Highly inhomogeneous infiltration and refreezing, however, redistributes mass, distorting age–depth relationships and confounding comparisons between different cores. Here, we utilize a dynamic time warping algorithm for time series alignment to investigate and quantify the heterogeneous impact of melt processes on nine closely spaced (within 50 m) firn core-density profiles. The 10 m cores were collected relatively high in Greenland's percolation zone, where melt alteration is minimal compared to lower elevation. Our analysis demonstrates the effectiveness of dynamic time warping as a tool for assessing heterogeneity between ice core records. We find that the optimal alignment of density profiles in the nine cores requires vertical stretching and compression of individual profiles, ranging from, on average, <1 to ~16% of the core lengths. We identified four depth zones of mass redistribution that appear to coincide with observed ice layers. Further, ~75% of density measurements from each core do not align with an age model-derived density profile that assumes no mass redistribution of meltwater, indicating the pervasive impact of melt processes. |
format |
Article in Journal/Newspaper |
author |
Cedric J. Hagen Joel T. Harper |
author_facet |
Cedric J. Hagen Joel T. Harper |
author_sort |
Cedric J. Hagen |
title |
Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
title_short |
Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
title_full |
Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
title_fullStr |
Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
title_full_unstemmed |
Dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
title_sort |
dynamic time warping to quantify age distortion in firn cores impacted by melt processes |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/aog.2023.52 https://doaj.org/article/b50b5c3addc640e6a0a696eb0c820169 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Annals of Glaciology Greenland ice core Ice Sheet |
genre_facet |
Annals of Glaciology Greenland ice core Ice Sheet |
op_source |
Annals of Glaciology, Pp 1-9 |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305523000526/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2023.52 0260-3055 1727-5644 https://doaj.org/article/b50b5c3addc640e6a0a696eb0c820169 |
op_doi |
https://doi.org/10.1017/aog.2023.52 |
container_title |
Annals of Glaciology |
container_start_page |
1 |
op_container_end_page |
9 |
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1776198706796691456 |