An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures
Arctic river deltas define the interface between the terrestrial Arctic and the Arctic Ocean. They are the site of sediment, nutrient, and soil organic carbon discharge to the Arctic Ocean. Arctic deltas are unique globally because they are underlain by permafrost and acted on by river and sea ice,...
Published in: | Earth Surface Dynamics |
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Language: | English |
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Copernicus Publications
2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00065855 2023-06-11T04:08:05+02:00 An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures Chan, Ngai-Ham Langer, Moritz Juhls, Bennet Rettelbach, Tabea Overduin, Paul Huppert, Kimberly Braun, Jean 2023-04 electronic https://doi.org/10.5194/esurf-11-259-2023 https://noa.gwlb.de/receive/cop_mods_00065855 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064365/esurf-11-259-2023.pdf https://esurf.copernicus.org/articles/11/259/2023/esurf-11-259-2023.pdf eng eng Copernicus Publications Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-11-259-2023 https://noa.gwlb.de/receive/cop_mods_00065855 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064365/esurf-11-259-2023.pdf https://esurf.copernicus.org/articles/11/259/2023/esurf-11-259-2023.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/esurf-11-259-2023 2023-04-23T23:20:00Z Arctic river deltas define the interface between the terrestrial Arctic and the Arctic Ocean. They are the site of sediment, nutrient, and soil organic carbon discharge to the Arctic Ocean. Arctic deltas are unique globally because they are underlain by permafrost and acted on by river and sea ice, and many are surrounded by a broad shallow ramp. Such ramps may buffer the delta from waves, but as the climate warms and permafrost thaws, the evolution of Arctic deltas will likely take a different course, with implications for both the local scale and the wider Arctic Ocean. One important way to understand and predict the evolution of Arctic deltas is through numerical models. Here we present ArcDelRCM.jl, an improved reduced-complexity model (RCM) of arctic delta evolution based on the DeltaRCM-Arctic model (Lauzon et al., 2019), which we have reconstructed in Julia language using published information. Unlike previous models, ArcDelRCM.jl is able to replicate the ramp around the delta. We have found that the delayed breakup of the so-called “bottom-fast ice” (i.e. ice that is in direct contact with the bed of the channel or the sea, also known as “bed-fast ice”) on and around the deltas is ultimately responsible for the appearance of the ramp feature in our models. However, changes made to the modelling of permafrost erosion and the protective effects of bottom-fast ice are also important contributors. Graph analyses of the delta network performed on ensemble runs show that deltas produced by ArcDelRCM.jl have more interconnected channels and contain less abandoned subnetworks. This may suggest a more even feeding of sediments to all sections of the delta shoreline, supporting ramp growth. Moreover, we showed that the morphodynamic processes during the summer months remain active enough to contribute significant sediment input to the growth and evolution of Arctic deltas and thus should not be neglected in simulations gauging the multi-year evolution of delta features. Finally, we tested a strong climate-warming ... Article in Journal/Newspaper Arctic Arctic Ocean Ice permafrost Sea ice Niedersächsisches Online-Archiv NOA Arctic Arctic Ocean The Ramp ENVELOPE(-38.305,-38.305,-53.990,-53.990) Earth Surface Dynamics 11 2 259 285 |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Chan, Ngai-Ham Langer, Moritz Juhls, Bennet Rettelbach, Tabea Overduin, Paul Huppert, Kimberly Braun, Jean An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
topic_facet |
article Verlagsveröffentlichung |
description |
Arctic river deltas define the interface between the terrestrial Arctic and the Arctic Ocean. They are the site of sediment, nutrient, and soil organic carbon discharge to the Arctic Ocean. Arctic deltas are unique globally because they are underlain by permafrost and acted on by river and sea ice, and many are surrounded by a broad shallow ramp. Such ramps may buffer the delta from waves, but as the climate warms and permafrost thaws, the evolution of Arctic deltas will likely take a different course, with implications for both the local scale and the wider Arctic Ocean. One important way to understand and predict the evolution of Arctic deltas is through numerical models. Here we present ArcDelRCM.jl, an improved reduced-complexity model (RCM) of arctic delta evolution based on the DeltaRCM-Arctic model (Lauzon et al., 2019), which we have reconstructed in Julia language using published information. Unlike previous models, ArcDelRCM.jl is able to replicate the ramp around the delta. We have found that the delayed breakup of the so-called “bottom-fast ice” (i.e. ice that is in direct contact with the bed of the channel or the sea, also known as “bed-fast ice”) on and around the deltas is ultimately responsible for the appearance of the ramp feature in our models. However, changes made to the modelling of permafrost erosion and the protective effects of bottom-fast ice are also important contributors. Graph analyses of the delta network performed on ensemble runs show that deltas produced by ArcDelRCM.jl have more interconnected channels and contain less abandoned subnetworks. This may suggest a more even feeding of sediments to all sections of the delta shoreline, supporting ramp growth. Moreover, we showed that the morphodynamic processes during the summer months remain active enough to contribute significant sediment input to the growth and evolution of Arctic deltas and thus should not be neglected in simulations gauging the multi-year evolution of delta features. Finally, we tested a strong climate-warming ... |
format |
Article in Journal/Newspaper |
author |
Chan, Ngai-Ham Langer, Moritz Juhls, Bennet Rettelbach, Tabea Overduin, Paul Huppert, Kimberly Braun, Jean |
author_facet |
Chan, Ngai-Ham Langer, Moritz Juhls, Bennet Rettelbach, Tabea Overduin, Paul Huppert, Kimberly Braun, Jean |
author_sort |
Chan, Ngai-Ham |
title |
An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
title_short |
An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
title_full |
An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
title_fullStr |
An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
title_full_unstemmed |
An Arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
title_sort |
arctic delta reduced-complexity model and its reproduction of key geomorphological structures |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/esurf-11-259-2023 https://noa.gwlb.de/receive/cop_mods_00065855 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064365/esurf-11-259-2023.pdf https://esurf.copernicus.org/articles/11/259/2023/esurf-11-259-2023.pdf |
long_lat |
ENVELOPE(-38.305,-38.305,-53.990,-53.990) |
geographic |
Arctic Arctic Ocean The Ramp |
geographic_facet |
Arctic Arctic Ocean The Ramp |
genre |
Arctic Arctic Ocean Ice permafrost Sea ice |
genre_facet |
Arctic Arctic Ocean Ice permafrost Sea ice |
op_relation |
Earth Surface Dynamics -- http://www.earth-surf-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2736054 -- 2196-632X https://doi.org/10.5194/esurf-11-259-2023 https://noa.gwlb.de/receive/cop_mods_00065855 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00064365/esurf-11-259-2023.pdf https://esurf.copernicus.org/articles/11/259/2023/esurf-11-259-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esurf-11-259-2023 |
container_title |
Earth Surface Dynamics |
container_volume |
11 |
container_issue |
2 |
container_start_page |
259 |
op_container_end_page |
285 |
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1768381204210384896 |