Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade
In many Arctic regions marine coastlines change rapidly in the currently warming climate. In contrast, coastal rock cliffs on Svalbard are considered to be comparably stable, based on previous studies that considered only a few years and limited coastal reaches. Long-term trends of coastal retreat r...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00065585 2023-05-15T14:29:00+02:00 Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade Aga, Juditha Piermattei, Livia Girod, Luc Aalstad, Kristoffer Eiken, Trond Kääb, Andreas Westermann, Sebastian 2023-03 electronic https://doi.org/10.5194/egusphere-2023-321 https://noa.gwlb.de/receive/cop_mods_00065585 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064102/egusphere-2023-321.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-321/egusphere-2023-321.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-321 https://noa.gwlb.de/receive/cop_mods_00065585 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064102/egusphere-2023-321.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-321/egusphere-2023-321.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-321 2023-03-26T23:15:38Z In many Arctic regions marine coastlines change rapidly in the currently warming climate. In contrast, coastal rock cliffs on Svalbard are considered to be comparably stable, based on previous studies that considered only a few years and limited coastal reaches. Long-term trends of coastal retreat rates in rock cliffs on Svalbard are unknown so far, but their quantification could improve the understanding of coastal dynamics on the Arctic archipelago. This study presents coastal retreat rates in rock cliffs along several kilometers of the Brøgger peninsula, Svalbard. The work is based on high-resolution orthoimages from 1970, 1990, 2010, and 2021, corroborated by high-precision dGNSS measurements along selected segments of the coastline and by rock surface temperature measurements during the period 2020–2021. Our analysis shows that coastal retreat rates accelerate statistically significant along the Brøgger peninsula in the time period of 2010 to 2021. This is true for both the northeast facing coastline, with retreat rates increasing from 0.04 ± 0.06 m/a (1970–1990) and 0.04 ± 0.04 m/a (1990–2010) to 0.07 ± 0.08 m/a (2010–2021) and the southwest facing coastline, where retreat rates of 0.26 ± 0.06 m/a (1970–1990), 0.24 ± 0.04 m/a (1990–2010) and 0.30 ± 0.08 m/a (2010–2021) are measured. Furthermore, the parts of the coastline affected by erosion increase along the northeast facing coastline from 47 % (1970–1990) to 65 % (2010–2021), while they stay consistently above 90 % along the southwest facing coastline. Measurements of rock surface temperature show mean annual values close to the thaw threshold with −0.49 °C at the southwest facing coastline, while records at the northeast facing coastline are lower with −1.64 °C. The recently accelerated retreat rates coincide with increasing storminess and retreating sea ice, together with increasing ground temperatures, all factors that can enhance coastal erosion. Article in Journal/Newspaper Arctic Archipelago Arctic Sea ice Svalbard Niedersächsisches Online-Archiv NOA Arctic Svalbard |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Aga, Juditha Piermattei, Livia Girod, Luc Aalstad, Kristoffer Eiken, Trond Kääb, Andreas Westermann, Sebastian Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
topic_facet |
article Verlagsveröffentlichung |
description |
In many Arctic regions marine coastlines change rapidly in the currently warming climate. In contrast, coastal rock cliffs on Svalbard are considered to be comparably stable, based on previous studies that considered only a few years and limited coastal reaches. Long-term trends of coastal retreat rates in rock cliffs on Svalbard are unknown so far, but their quantification could improve the understanding of coastal dynamics on the Arctic archipelago. This study presents coastal retreat rates in rock cliffs along several kilometers of the Brøgger peninsula, Svalbard. The work is based on high-resolution orthoimages from 1970, 1990, 2010, and 2021, corroborated by high-precision dGNSS measurements along selected segments of the coastline and by rock surface temperature measurements during the period 2020–2021. Our analysis shows that coastal retreat rates accelerate statistically significant along the Brøgger peninsula in the time period of 2010 to 2021. This is true for both the northeast facing coastline, with retreat rates increasing from 0.04 ± 0.06 m/a (1970–1990) and 0.04 ± 0.04 m/a (1990–2010) to 0.07 ± 0.08 m/a (2010–2021) and the southwest facing coastline, where retreat rates of 0.26 ± 0.06 m/a (1970–1990), 0.24 ± 0.04 m/a (1990–2010) and 0.30 ± 0.08 m/a (2010–2021) are measured. Furthermore, the parts of the coastline affected by erosion increase along the northeast facing coastline from 47 % (1970–1990) to 65 % (2010–2021), while they stay consistently above 90 % along the southwest facing coastline. Measurements of rock surface temperature show mean annual values close to the thaw threshold with −0.49 °C at the southwest facing coastline, while records at the northeast facing coastline are lower with −1.64 °C. The recently accelerated retreat rates coincide with increasing storminess and retreating sea ice, together with increasing ground temperatures, all factors that can enhance coastal erosion. |
format |
Article in Journal/Newspaper |
author |
Aga, Juditha Piermattei, Livia Girod, Luc Aalstad, Kristoffer Eiken, Trond Kääb, Andreas Westermann, Sebastian |
author_facet |
Aga, Juditha Piermattei, Livia Girod, Luc Aalstad, Kristoffer Eiken, Trond Kääb, Andreas Westermann, Sebastian |
author_sort |
Aga, Juditha |
title |
Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
title_short |
Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
title_full |
Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
title_fullStr |
Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
title_full_unstemmed |
Coastal retreat rates of high-Arctic rock cliffs on Brøgger peninsula, Svalbard, accelerate during the past decade |
title_sort |
coastal retreat rates of high-arctic rock cliffs on brøgger peninsula, svalbard, accelerate during the past decade |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-321 https://noa.gwlb.de/receive/cop_mods_00065585 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064102/egusphere-2023-321.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-321/egusphere-2023-321.pdf |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Archipelago Arctic Sea ice Svalbard |
genre_facet |
Arctic Archipelago Arctic Sea ice Svalbard |
op_relation |
https://doi.org/10.5194/egusphere-2023-321 https://noa.gwlb.de/receive/cop_mods_00065585 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064102/egusphere-2023-321.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-321/egusphere-2023-321.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-321 |
_version_ |
1766303110964183040 |