Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing
Changes in iceberg calving fluxes and oceanographic conditions around Antarctica have likely influenced the spatial and temporal distribution of iceberg fresh water fluxes to the surrounding ocean basins. However, Antarctic iceberg melt rate estimates have been limited to very large icebergs in the...
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ftdoajarticles:oai:doaj.org/article:1c8f9076989349f9a4116f5716d79e11 2023-09-05T13:14:09+02:00 Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing Ellyn M. Enderlin Carlos Moffat Emily Miller Adam Dickson Caitlin Oliver Mariama C. Dryák-Vallies Rainey Aberle https://doi.org/10.1017/jog.2023.54 https://doaj.org/article/1c8f9076989349f9a4116f5716d79e11 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143023000540/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.54 0022-1430 1727-5652 https://doaj.org/article/1c8f9076989349f9a4116f5716d79e11 Journal of Glaciology, Pp 1-11 Antarctic glaciology icebergs ice/ocean interactions polar and subpolar oceans remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/jog.2023.54 2023-08-20T00:35:49Z Changes in iceberg calving fluxes and oceanographic conditions around Antarctica have likely influenced the spatial and temporal distribution of iceberg fresh water fluxes to the surrounding ocean basins. However, Antarctic iceberg melt rate estimates have been limited to very large icebergs in the open ocean. Here we use a remote-sensing approach to estimate iceberg melt rates from 2011 to 2022 for 15 study sites around Antarctica. Melt rates generally increase with iceberg draft and follow large-scale variations in ocean temperature: maximum melt rates for the western peninsula, western ice sheet, eastern ice sheet and eastern peninsula are ~50, ~40, ~5 and ~5 m a−1, respectively. Iceberg melt sensitivity to thermal forcing varies widely, with a best-estimate increase in melting of ~24 m a−1°C−1 and range from near-zero to ~100 m a−1°C−1. Variations in water shear likely contribute to the apparent spread in thermal forcing sensitivity across sites. Although the sensitivity of iceberg melt rates to water shear prevents the use of melt rates as a proxy to infer coastal water mass temperature variability, additional coastal iceberg melt observations will likely improve models of Southern Ocean fresh water fluxes and have potential for subglacial discharge plume mapping. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Iceberg* Journal of Glaciology Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Journal of Glaciology 1 11 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology icebergs ice/ocean interactions polar and subpolar oceans remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology icebergs ice/ocean interactions polar and subpolar oceans remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Ellyn M. Enderlin Carlos Moffat Emily Miller Adam Dickson Caitlin Oliver Mariama C. Dryák-Vallies Rainey Aberle Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
topic_facet |
Antarctic glaciology icebergs ice/ocean interactions polar and subpolar oceans remote sensing Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Changes in iceberg calving fluxes and oceanographic conditions around Antarctica have likely influenced the spatial and temporal distribution of iceberg fresh water fluxes to the surrounding ocean basins. However, Antarctic iceberg melt rate estimates have been limited to very large icebergs in the open ocean. Here we use a remote-sensing approach to estimate iceberg melt rates from 2011 to 2022 for 15 study sites around Antarctica. Melt rates generally increase with iceberg draft and follow large-scale variations in ocean temperature: maximum melt rates for the western peninsula, western ice sheet, eastern ice sheet and eastern peninsula are ~50, ~40, ~5 and ~5 m a−1, respectively. Iceberg melt sensitivity to thermal forcing varies widely, with a best-estimate increase in melting of ~24 m a−1°C−1 and range from near-zero to ~100 m a−1°C−1. Variations in water shear likely contribute to the apparent spread in thermal forcing sensitivity across sites. Although the sensitivity of iceberg melt rates to water shear prevents the use of melt rates as a proxy to infer coastal water mass temperature variability, additional coastal iceberg melt observations will likely improve models of Southern Ocean fresh water fluxes and have potential for subglacial discharge plume mapping. |
format |
Article in Journal/Newspaper |
author |
Ellyn M. Enderlin Carlos Moffat Emily Miller Adam Dickson Caitlin Oliver Mariama C. Dryák-Vallies Rainey Aberle |
author_facet |
Ellyn M. Enderlin Carlos Moffat Emily Miller Adam Dickson Caitlin Oliver Mariama C. Dryák-Vallies Rainey Aberle |
author_sort |
Ellyn M. Enderlin |
title |
Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
title_short |
Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
title_full |
Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
title_fullStr |
Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
title_full_unstemmed |
Antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
title_sort |
antarctic iceberg melt rate variability and sensitivity to ocean thermal forcing |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/jog.2023.54 https://doaj.org/article/1c8f9076989349f9a4116f5716d79e11 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* Journal of Glaciology Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* Journal of Glaciology Southern Ocean |
op_source |
Journal of Glaciology, Pp 1-11 |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143023000540/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.54 0022-1430 1727-5652 https://doaj.org/article/1c8f9076989349f9a4116f5716d79e11 |
op_doi |
https://doi.org/10.1017/jog.2023.54 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
11 |
_version_ |
1776205203777781760 |