New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data
The effect that sea ice topography has on the momentum transfer between ice and atmosphere is not fully quantified due to the vast extent of the Arctic and limitations of current measurement techniques. Here we present a method to estimate pan-Arctic momentum transfer via a parameterization that lin...
Published in: | The Cryosphere |
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ftcopernicus:oai:publications.copernicus.org:tc109419 2023-10-25T01:28:17+02:00 New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data Mchedlishvili, Alexander Lüpkes, Christof Petty, Alek Tsamados, Michel Spreen, Gunnar 2023-09-21 application/pdf https://doi.org/10.5194/tc-17-4103-2023 https://tc.copernicus.org/articles/17/4103/2023/ eng eng doi:10.5194/tc-17-4103-2023 https://tc.copernicus.org/articles/17/4103/2023/ eISSN: 1994-0424 Text 2023 ftcopernicus https://doi.org/10.5194/tc-17-4103-2023 2023-09-25T16:24:15Z The effect that sea ice topography has on the momentum transfer between ice and atmosphere is not fully quantified due to the vast extent of the Arctic and limitations of current measurement techniques. Here we present a method to estimate pan-Arctic momentum transfer via a parameterization that links sea ice–atmosphere form drag coefficients with surface feature height and spacing. We measure these sea ice surface feature parameters using the Ice, Cloud and land Elevation Satellite-2 (ICESat-2). Though ICESat-2 is unable to resolve as well as airborne surveys, it has a higher along-track spatial resolution than other contemporary altimeter satellites. As some narrow obstacles are effectively smoothed out by the ICESat-2 ATL07 spatial resolution, we use near-coincident high-resolution Airborne Topographic Mapper (ATM) elevation data from NASA's Operation IceBridge (OIB) mission to scale up the regional ICESat-2 drag estimates. By also incorporating drag due to open water, floe edges and sea ice skin drag, we produced a time series of average total pan-Arctic neutral atmospheric drag coefficient estimates from November 2018 to May 2022. Here we have observed its temporal evolution to be unique and not directly tied to sea ice extent. By also mapping 3-month aggregates for the years 2019, 2020 and 2021 for better regional analysis, we found the thick multiyear ice area directly north of the Canadian Archipelago and Greenland to be consistently above 2.0 × 10 - 3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="51pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="5e5ce4c8526479d3b8b800a7ecedd868"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-4103-2023-ie00001.svg" width="51pt" height="14pt" src="tc-17-4103-2023-ie00001.png"/></svg:svg> , while most of the multiyear ice portion of the Arctic is typically around ∼ 1.5 × 10 - 3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="61pt" height="14pt" class="svg-formula" dspmath="mathimg" ... Text Airborne Topographic Mapper Arctic Canadian Archipelago Greenland Sea ice Copernicus Publications: E-Journals Arctic Greenland The Cryosphere 17 9 4103 4131 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The effect that sea ice topography has on the momentum transfer between ice and atmosphere is not fully quantified due to the vast extent of the Arctic and limitations of current measurement techniques. Here we present a method to estimate pan-Arctic momentum transfer via a parameterization that links sea ice–atmosphere form drag coefficients with surface feature height and spacing. We measure these sea ice surface feature parameters using the Ice, Cloud and land Elevation Satellite-2 (ICESat-2). Though ICESat-2 is unable to resolve as well as airborne surveys, it has a higher along-track spatial resolution than other contemporary altimeter satellites. As some narrow obstacles are effectively smoothed out by the ICESat-2 ATL07 spatial resolution, we use near-coincident high-resolution Airborne Topographic Mapper (ATM) elevation data from NASA's Operation IceBridge (OIB) mission to scale up the regional ICESat-2 drag estimates. By also incorporating drag due to open water, floe edges and sea ice skin drag, we produced a time series of average total pan-Arctic neutral atmospheric drag coefficient estimates from November 2018 to May 2022. Here we have observed its temporal evolution to be unique and not directly tied to sea ice extent. By also mapping 3-month aggregates for the years 2019, 2020 and 2021 for better regional analysis, we found the thick multiyear ice area directly north of the Canadian Archipelago and Greenland to be consistently above 2.0 × 10 - 3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="51pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="5e5ce4c8526479d3b8b800a7ecedd868"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-17-4103-2023-ie00001.svg" width="51pt" height="14pt" src="tc-17-4103-2023-ie00001.png"/></svg:svg> , while most of the multiyear ice portion of the Arctic is typically around ∼ 1.5 × 10 - 3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="61pt" height="14pt" class="svg-formula" dspmath="mathimg" ... |
format |
Text |
author |
Mchedlishvili, Alexander Lüpkes, Christof Petty, Alek Tsamados, Michel Spreen, Gunnar |
spellingShingle |
Mchedlishvili, Alexander Lüpkes, Christof Petty, Alek Tsamados, Michel Spreen, Gunnar New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
author_facet |
Mchedlishvili, Alexander Lüpkes, Christof Petty, Alek Tsamados, Michel Spreen, Gunnar |
author_sort |
Mchedlishvili, Alexander |
title |
New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
title_short |
New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
title_full |
New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
title_fullStr |
New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
title_full_unstemmed |
New estimates of pan-Arctic sea ice–atmosphere neutral drag coefficients from ICESat-2 elevation data |
title_sort |
new estimates of pan-arctic sea ice–atmosphere neutral drag coefficients from icesat-2 elevation data |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-4103-2023 https://tc.copernicus.org/articles/17/4103/2023/ |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Airborne Topographic Mapper Arctic Canadian Archipelago Greenland Sea ice |
genre_facet |
Airborne Topographic Mapper Arctic Canadian Archipelago Greenland Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-17-4103-2023 https://tc.copernicus.org/articles/17/4103/2023/ |
op_doi |
https://doi.org/10.5194/tc-17-4103-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
9 |
container_start_page |
4103 |
op_container_end_page |
4131 |
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1780738964328546304 |