Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data
Abstract Passive microwave satellite observations are used to identify the presence of surface meltwater across Antarctica at daily intervals from July 1979 to June 2020, with a focus on ice shelves. Antarctic Peninsula ice shelves have the highest number of annual days of melt, with a maximum of 89...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1017/jog.2021.112 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302100112X |
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crcambridgeupr:10.1017/jog.2021.112 2024-06-23T07:47:02+00:00 Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data Johnson, Andrew Hock, Regine Fahnestock, Mark National Aeronautics and Space Administration National Science Foundation 2021 http://dx.doi.org/10.1017/jog.2021.112 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302100112X en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 68, issue 269, page 533-546 ISSN 0022-1430 1727-5652 journal-article 2021 crcambridgeupr https://doi.org/10.1017/jog.2021.112 2024-06-12T04:05:01Z Abstract Passive microwave satellite observations are used to identify the presence of surface meltwater across Antarctica at daily intervals from July 1979 to June 2020, with a focus on ice shelves. Antarctic Peninsula ice shelves have the highest number of annual days of melt, with a maximum of 89 days. Over the entire time period, there are few significant linear trends in days of melt per year. High melt years can be split into two distinct categories, those with high melt days in Dronning Maud Land and Wilkes Land, and those with high melt days in the Antarctic Peninsula and the Bellingshausen Sea sector of West Antarctica. The first pattern coincides with significant negative correlations between melt days and spring and summer Southern Annular Mode. Both patterns also form the primary modes of spatial and annual variability in the dataset observed by Principal Component Analysis. Areas experiencing extended melt for the first time in years tend to show large decreases in subsequent winter microwave emissions due to structural changes in the firn. We use this to identify the impact of novel melt events, particularly over the austral summers of 1991/92 and 2015/16 on the Ross Ice Shelf. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Dronning Maud Land Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf West Antarctica Wilkes Land Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Austral Dronning Maud Land West Antarctica Bellingshausen Sea Ross Ice Shelf Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Journal of Glaciology 1 14 |
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Cambridge University Press |
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English |
description |
Abstract Passive microwave satellite observations are used to identify the presence of surface meltwater across Antarctica at daily intervals from July 1979 to June 2020, with a focus on ice shelves. Antarctic Peninsula ice shelves have the highest number of annual days of melt, with a maximum of 89 days. Over the entire time period, there are few significant linear trends in days of melt per year. High melt years can be split into two distinct categories, those with high melt days in Dronning Maud Land and Wilkes Land, and those with high melt days in the Antarctic Peninsula and the Bellingshausen Sea sector of West Antarctica. The first pattern coincides with significant negative correlations between melt days and spring and summer Southern Annular Mode. Both patterns also form the primary modes of spatial and annual variability in the dataset observed by Principal Component Analysis. Areas experiencing extended melt for the first time in years tend to show large decreases in subsequent winter microwave emissions due to structural changes in the firn. We use this to identify the impact of novel melt events, particularly over the austral summers of 1991/92 and 2015/16 on the Ross Ice Shelf. |
author2 |
National Aeronautics and Space Administration National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Johnson, Andrew Hock, Regine Fahnestock, Mark |
spellingShingle |
Johnson, Andrew Hock, Regine Fahnestock, Mark Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
author_facet |
Johnson, Andrew Hock, Regine Fahnestock, Mark |
author_sort |
Johnson, Andrew |
title |
Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
title_short |
Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
title_full |
Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
title_fullStr |
Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
title_full_unstemmed |
Spatial variability and regional trends of Antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
title_sort |
spatial variability and regional trends of antarctic ice shelf surface melt duration over 1979–2020 derived from passive microwave data |
publisher |
Cambridge University Press (CUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1017/jog.2021.112 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002214302100112X |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Austral Dronning Maud Land West Antarctica Bellingshausen Sea Ross Ice Shelf Wilkes Land |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Austral Dronning Maud Land West Antarctica Bellingshausen Sea Ross Ice Shelf Wilkes Land |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Dronning Maud Land Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf West Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Bellingshausen Sea Dronning Maud Land Ice Shelf Ice Shelves Journal of Glaciology Ross Ice Shelf West Antarctica Wilkes Land |
op_source |
Journal of Glaciology volume 68, issue 269, page 533-546 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2021.112 |
container_title |
Journal of Glaciology |
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1 |
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14 |
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1802650389384790016 |