Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm
Retreat and advance of ice sheets perturb the gravitational field, solid surface and rotation of the Earth, leading to spatially variable sea-level changes over a range of timescales O (10 0−6 years), which in turn feed back onto ice-sheet dynamics. Coupled ice-sheet–sea-level models have been devel...
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ftdoajarticles:oai:doaj.org/article:edd486a4c3854fd4b2fc4212488d7171 2023-05-15T13:56:11+02:00 Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm H. K. Han N. Gomez J. X. W. Wan 2022-02-01T00:00:00Z https://doi.org/10.5194/gmd-15-1355-2022 https://doaj.org/article/edd486a4c3854fd4b2fc4212488d7171 EN eng Copernicus Publications https://gmd.copernicus.org/articles/15/1355/2022/gmd-15-1355-2022.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-15-1355-2022 1991-959X 1991-9603 https://doaj.org/article/edd486a4c3854fd4b2fc4212488d7171 Geoscientific Model Development, Vol 15, Pp 1355-1373 (2022) Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/gmd-15-1355-2022 2022-12-31T15:08:50Z Retreat and advance of ice sheets perturb the gravitational field, solid surface and rotation of the Earth, leading to spatially variable sea-level changes over a range of timescales O (10 0−6 years), which in turn feed back onto ice-sheet dynamics. Coupled ice-sheet–sea-level models have been developed to capture the interactive processes between ice sheets, sea level and the solid Earth, but it is computationally challenging to capture short-term interactions O (10 0−2 years) precisely within longer O (10 3−6 years) simulations. The standard forward sea-level modelling algorithm assigns a uniform temporal resolution in the sea-level model, causing a quadratic increase in total CPU time with the total number of input ice history steps, which increases with either the length or temporal resolution of the simulation. In this study, we introduce a new “time window” algorithm for 1D pseudo-spectral sea-level models based on the normal mode method that enables users to define the temporal resolution at which the ice loading history is captured during different time intervals before the current simulation time. Utilizing the time window, we assign a fine temporal resolution O (10 0−2 years) for the period of ongoing and recent history of surface ice and ocean loading changes and a coarser temporal resolution O (10 3−6 years) for earlier periods in the simulation. This reduces the total CPU time and memory required per model time step while maintaining the precision of the model results. We explore the sensitivity of sea-level model results to the model temporal resolution and show how this sensitivity feeds back onto ice-sheet dynamics in coupled modelling. We apply the new algorithm to simulate sea-level changes in response to global ice-sheet evolution over two glacial cycles and the rapid collapse of marine sectors of the West Antarctic Ice Sheet in the coming centuries and provide appropriate time window profiles for each application. The time window algorithm reduces the total CPU time by ∼ 50 % in each of these ... Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic West Antarctic Ice Sheet Geoscientific Model Development 15 3 1355 1373 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 H. K. Han N. Gomez J. X. W. Wan Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
topic_facet |
Geology QE1-996.5 |
description |
Retreat and advance of ice sheets perturb the gravitational field, solid surface and rotation of the Earth, leading to spatially variable sea-level changes over a range of timescales O (10 0−6 years), which in turn feed back onto ice-sheet dynamics. Coupled ice-sheet–sea-level models have been developed to capture the interactive processes between ice sheets, sea level and the solid Earth, but it is computationally challenging to capture short-term interactions O (10 0−2 years) precisely within longer O (10 3−6 years) simulations. The standard forward sea-level modelling algorithm assigns a uniform temporal resolution in the sea-level model, causing a quadratic increase in total CPU time with the total number of input ice history steps, which increases with either the length or temporal resolution of the simulation. In this study, we introduce a new “time window” algorithm for 1D pseudo-spectral sea-level models based on the normal mode method that enables users to define the temporal resolution at which the ice loading history is captured during different time intervals before the current simulation time. Utilizing the time window, we assign a fine temporal resolution O (10 0−2 years) for the period of ongoing and recent history of surface ice and ocean loading changes and a coarser temporal resolution O (10 3−6 years) for earlier periods in the simulation. This reduces the total CPU time and memory required per model time step while maintaining the precision of the model results. We explore the sensitivity of sea-level model results to the model temporal resolution and show how this sensitivity feeds back onto ice-sheet dynamics in coupled modelling. We apply the new algorithm to simulate sea-level changes in response to global ice-sheet evolution over two glacial cycles and the rapid collapse of marine sectors of the West Antarctic Ice Sheet in the coming centuries and provide appropriate time window profiles for each application. The time window algorithm reduces the total CPU time by ∼ 50 % in each of these ... |
format |
Article in Journal/Newspaper |
author |
H. K. Han N. Gomez J. X. W. Wan |
author_facet |
H. K. Han N. Gomez J. X. W. Wan |
author_sort |
H. K. Han |
title |
Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
title_short |
Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
title_full |
Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
title_fullStr |
Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
title_full_unstemmed |
Capturing the interactions between ice sheets, sea level and the solid Earth on a range of timescales: a new “time window” algorithm |
title_sort |
capturing the interactions between ice sheets, sea level and the solid earth on a range of timescales: a new “time window” algorithm |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/gmd-15-1355-2022 https://doaj.org/article/edd486a4c3854fd4b2fc4212488d7171 |
geographic |
Antarctic West Antarctic Ice Sheet |
geographic_facet |
Antarctic West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Geoscientific Model Development, Vol 15, Pp 1355-1373 (2022) |
op_relation |
https://gmd.copernicus.org/articles/15/1355/2022/gmd-15-1355-2022.pdf https://doaj.org/toc/1991-959X https://doaj.org/toc/1991-9603 doi:10.5194/gmd-15-1355-2022 1991-959X 1991-9603 https://doaj.org/article/edd486a4c3854fd4b2fc4212488d7171 |
op_doi |
https://doi.org/10.5194/gmd-15-1355-2022 |
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Geoscientific Model Development |
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1373 |
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