Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A
Firn simulations are essential for understanding Antarctic ice sheet mass change, as they enable us to convert satellite altimetry observed volume changes to mass changes and column thickness to ice thickness and to quantify the meltwater buffering capacity of firn. Here, we present and evaluate a s...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/428200 2023-07-23T04:14:58+02:00 Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A Veldhuijsen, Sanne van de Berg, Willem Jan Brils, Max Kuipers Munneke, Peter van den Broeke, Michiel Sub Dynamics Meteorology Marine and Atmospheric Research 2023-04-17 application/pdf https://dspace.library.uu.nl/handle/1874/428200 en eng 1994-0424 https://dspace.library.uu.nl/handle/1874/428200 info:eu-repo/semantics/OpenAccess Article 2023 ftunivutrecht 2023-07-02T03:56:11Z Firn simulations are essential for understanding Antarctic ice sheet mass change, as they enable us to convert satellite altimetry observed volume changes to mass changes and column thickness to ice thickness and to quantify the meltwater buffering capacity of firn. Here, we present and evaluate a simulation of the contemporary Antarctic firn layer using the updated semi-empirical IMAU Firn Densification Model (IMAU-FDM) for the period 1979–2020. We have improved previous fresh-snow density and firn compaction parameterizations and used updated atmospheric forcing. In addition, the model has been calibrated and evaluated using 112 firn core density observations across the ice sheet. We found that 62 % of the seasonal and 67 % of the decadal surface height variability are due to variations in firn air content rather than firn mass. Comparison of simulated surface elevation change with a previously published multi-mission altimetry product for the period 2003–2015 shows that performance of the updated model has improved, notably in Dronning Maud Land and Wilkes Land. However, a substantial trend difference (>10 cm yr−1) remains in the Antarctic Peninsula and Ellsworth Land, mainly caused by uncertainties in the spin-up forcing. By estimating previous climatic conditions from ice core data, these trend differences can be reduced by 38 %. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Dronning Maud Land ice core Ice Sheet Wilkes Land Utrecht University Repository Antarctic Antarctic Peninsula Dronning Maud Land Ellsworth Land ENVELOPE(-85.000,-85.000,-75.000,-75.000) The Antarctic Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) |
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Open Polar |
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Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
description |
Firn simulations are essential for understanding Antarctic ice sheet mass change, as they enable us to convert satellite altimetry observed volume changes to mass changes and column thickness to ice thickness and to quantify the meltwater buffering capacity of firn. Here, we present and evaluate a simulation of the contemporary Antarctic firn layer using the updated semi-empirical IMAU Firn Densification Model (IMAU-FDM) for the period 1979–2020. We have improved previous fresh-snow density and firn compaction parameterizations and used updated atmospheric forcing. In addition, the model has been calibrated and evaluated using 112 firn core density observations across the ice sheet. We found that 62 % of the seasonal and 67 % of the decadal surface height variability are due to variations in firn air content rather than firn mass. Comparison of simulated surface elevation change with a previously published multi-mission altimetry product for the period 2003–2015 shows that performance of the updated model has improved, notably in Dronning Maud Land and Wilkes Land. However, a substantial trend difference (>10 cm yr−1) remains in the Antarctic Peninsula and Ellsworth Land, mainly caused by uncertainties in the spin-up forcing. By estimating previous climatic conditions from ice core data, these trend differences can be reduced by 38 %. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Veldhuijsen, Sanne van de Berg, Willem Jan Brils, Max Kuipers Munneke, Peter van den Broeke, Michiel |
spellingShingle |
Veldhuijsen, Sanne van de Berg, Willem Jan Brils, Max Kuipers Munneke, Peter van den Broeke, Michiel Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
author_facet |
Veldhuijsen, Sanne van de Berg, Willem Jan Brils, Max Kuipers Munneke, Peter van den Broeke, Michiel |
author_sort |
Veldhuijsen, Sanne |
title |
Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
title_short |
Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
title_full |
Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
title_fullStr |
Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
title_full_unstemmed |
Characteristics of the 1979–2020 Antarctic firn layer simulated with IMAU-FDM v1.2A |
title_sort |
characteristics of the 1979–2020 antarctic firn layer simulated with imau-fdm v1.2a |
publishDate |
2023 |
url |
https://dspace.library.uu.nl/handle/1874/428200 |
long_lat |
ENVELOPE(-85.000,-85.000,-75.000,-75.000) ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic Antarctic Peninsula Dronning Maud Land Ellsworth Land The Antarctic Wilkes Land |
geographic_facet |
Antarctic Antarctic Peninsula Dronning Maud Land Ellsworth Land The Antarctic Wilkes Land |
genre |
Antarc* Antarctic Antarctic Peninsula Dronning Maud Land ice core Ice Sheet Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Dronning Maud Land ice core Ice Sheet Wilkes Land |
op_relation |
1994-0424 https://dspace.library.uu.nl/handle/1874/428200 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772188748649332736 |