Significant contribution of small icebergs to the freshwater budget in Greenland fjords
Icebergs represent nearly half of the mass loss from the Greenland Ice Sheet and provide a distributed source of freshwater along fjords which can alter fjord circulation, nutrient levels, and ultimately the Meridional Overturning Circulation. Here we present analyses of high resolution optical sate...
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ftpubmed:oai:pubmedcentral.nih.gov:7594622 2023-05-15T16:03:44+02:00 Significant contribution of small icebergs to the freshwater budget in Greenland fjords Rezvanbehbahani, Soroush Stearns, Leigh A. Keramati, Ramtin Shankar, Siddharth van der Veen, C. J. 2020-10-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594622/ https://doi.org/10.1038/s43247-020-00032-3 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594622/ http://dx.doi.org/10.1038/s43247-020-00032-3 © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Commun Earth Environ Article Text 2020 ftpubmed https://doi.org/10.1038/s43247-020-00032-3 2020-11-15T01:31:21Z Icebergs represent nearly half of the mass loss from the Greenland Ice Sheet and provide a distributed source of freshwater along fjords which can alter fjord circulation, nutrient levels, and ultimately the Meridional Overturning Circulation. Here we present analyses of high resolution optical satellite imagery using convolutional neural networks to accurately delineate iceberg edges in two East Greenland fjords. We find that a significant portion of icebergs in fjords are comprised of small icebergs that were not detected in previously-available coarser resolution satellite images. We show that the preponderance of small icebergs results in high freshwater delivery, as well as a short life span of icebergs in fjords. We conclude that an inability to identify small icebergs leads to inaccurate frequency-size distribution of icebergs in Greenland fjords, an underestimation of iceberg area (specifically for small icebergs), and an overestimation of iceberg life span. Text East Greenland Greenland Ice Sheet PubMed Central (PMC) Greenland Communications Earth & Environment 1 1 |
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Article Rezvanbehbahani, Soroush Stearns, Leigh A. Keramati, Ramtin Shankar, Siddharth van der Veen, C. J. Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
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Article |
description |
Icebergs represent nearly half of the mass loss from the Greenland Ice Sheet and provide a distributed source of freshwater along fjords which can alter fjord circulation, nutrient levels, and ultimately the Meridional Overturning Circulation. Here we present analyses of high resolution optical satellite imagery using convolutional neural networks to accurately delineate iceberg edges in two East Greenland fjords. We find that a significant portion of icebergs in fjords are comprised of small icebergs that were not detected in previously-available coarser resolution satellite images. We show that the preponderance of small icebergs results in high freshwater delivery, as well as a short life span of icebergs in fjords. We conclude that an inability to identify small icebergs leads to inaccurate frequency-size distribution of icebergs in Greenland fjords, an underestimation of iceberg area (specifically for small icebergs), and an overestimation of iceberg life span. |
format |
Text |
author |
Rezvanbehbahani, Soroush Stearns, Leigh A. Keramati, Ramtin Shankar, Siddharth van der Veen, C. J. |
author_facet |
Rezvanbehbahani, Soroush Stearns, Leigh A. Keramati, Ramtin Shankar, Siddharth van der Veen, C. J. |
author_sort |
Rezvanbehbahani, Soroush |
title |
Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
title_short |
Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
title_full |
Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
title_fullStr |
Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
title_full_unstemmed |
Significant contribution of small icebergs to the freshwater budget in Greenland fjords |
title_sort |
significant contribution of small icebergs to the freshwater budget in greenland fjords |
publisher |
Nature Publishing Group UK |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594622/ https://doi.org/10.1038/s43247-020-00032-3 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Ice Sheet |
genre_facet |
East Greenland Greenland Ice Sheet |
op_source |
Commun Earth Environ |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7594622/ http://dx.doi.org/10.1038/s43247-020-00032-3 |
op_rights |
© The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s43247-020-00032-3 |
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Communications Earth & Environment |
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