Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica
Cryoconite holes are structures characteristic of the glacierised ablation areas, formed from dark sediment deposition which melt the glacier ice leading to their cylindrical structure formation. The present study focuses on an unstudied blue ice area of East Antarctica over the Hells Gate Ice Shelf...
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ftdoajarticles:oai:doaj.org/article:a04ed42eeb1042dbaf9844194ae8febe 2024-09-15T17:39:55+00:00 Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica Giacomo Traversa Riccardo Scipinotti Samuele Pierattini Gianluca Bianchi Fasani Biagio Di Mauro https://doi.org/10.1017/aog.2024.20 https://doaj.org/article/a04ed42eeb1042dbaf9844194ae8febe EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S026030552400020X/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2024.20 0260-3055 1727-5644 https://doaj.org/article/a04ed42eeb1042dbaf9844194ae8febe Annals of Glaciology, Pp 1-10 Antarctic glaciology blue ice ice shelves remote sensing Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/aog.2024.20 2024-08-05T17:49:23Z Cryoconite holes are structures characteristic of the glacierised ablation areas, formed from dark sediment deposition which melt the glacier ice leading to their cylindrical structure formation. The present study focuses on an unstudied blue ice area of East Antarctica over the Hells Gate Ice Shelf in Northern Victoria Land. Taking advantage of neural network methodology applied on drone acquisitions, an automatic detection of cryoconite holes was carried out (88% of accuracy), mapping ~3500 m2 (0.4% fractional cover) of cryoconite holes over an area of 900 000 m2. The surveyed area showed heterogeneity in cryoconite hole distribution, with some regions showing an area fraction of holes (regions exhibiting frozen ponds and ice bands) as high as 8%. Thanks to this detection, the spatially integrated radiative forcing of cryoconite holes over blue ice surface was estimated to be almost 1 Wm−2. This estimation was based on the measured albedo difference between the two surfaces, which averages 0.31. However, the radiative forcing is strongly increased if calculated at a single cryoconite hole scale, showing an average of ~200 Wm−2. In conclusion, the present research represents a first attempt of analysing cryoconite holes as factors impacting the blue ice in Northern Victoria Land, deepening our understanding of their glaciological role at the margins of the East Antarctic Ice Sheet. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Victoria Land Directory of Open Access Journals: DOAJ Articles Annals of Glaciology 1 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology blue ice ice shelves remote sensing Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology blue ice ice shelves remote sensing Meteorology. Climatology QC851-999 Giacomo Traversa Riccardo Scipinotti Samuele Pierattini Gianluca Bianchi Fasani Biagio Di Mauro Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
topic_facet |
Antarctic glaciology blue ice ice shelves remote sensing Meteorology. Climatology QC851-999 |
description |
Cryoconite holes are structures characteristic of the glacierised ablation areas, formed from dark sediment deposition which melt the glacier ice leading to their cylindrical structure formation. The present study focuses on an unstudied blue ice area of East Antarctica over the Hells Gate Ice Shelf in Northern Victoria Land. Taking advantage of neural network methodology applied on drone acquisitions, an automatic detection of cryoconite holes was carried out (88% of accuracy), mapping ~3500 m2 (0.4% fractional cover) of cryoconite holes over an area of 900 000 m2. The surveyed area showed heterogeneity in cryoconite hole distribution, with some regions showing an area fraction of holes (regions exhibiting frozen ponds and ice bands) as high as 8%. Thanks to this detection, the spatially integrated radiative forcing of cryoconite holes over blue ice surface was estimated to be almost 1 Wm−2. This estimation was based on the measured albedo difference between the two surfaces, which averages 0.31. However, the radiative forcing is strongly increased if calculated at a single cryoconite hole scale, showing an average of ~200 Wm−2. In conclusion, the present research represents a first attempt of analysing cryoconite holes as factors impacting the blue ice in Northern Victoria Land, deepening our understanding of their glaciological role at the margins of the East Antarctic Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Giacomo Traversa Riccardo Scipinotti Samuele Pierattini Gianluca Bianchi Fasani Biagio Di Mauro |
author_facet |
Giacomo Traversa Riccardo Scipinotti Samuele Pierattini Gianluca Bianchi Fasani Biagio Di Mauro |
author_sort |
Giacomo Traversa |
title |
Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
title_short |
Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
title_full |
Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
title_fullStr |
Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
title_full_unstemmed |
Cryoconite holes geomorphometry, spatial distribution and radiative impact over the Hells Gate Ice Shelf, East Antarctica |
title_sort |
cryoconite holes geomorphometry, spatial distribution and radiative impact over the hells gate ice shelf, east antarctica |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/aog.2024.20 https://doaj.org/article/a04ed42eeb1042dbaf9844194ae8febe |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Victoria Land |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Victoria Land |
op_source |
Annals of Glaciology, Pp 1-10 |
op_relation |
https://www.cambridge.org/core/product/identifier/S026030552400020X/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2024.20 0260-3055 1727-5644 https://doaj.org/article/a04ed42eeb1042dbaf9844194ae8febe |
op_doi |
https://doi.org/10.1017/aog.2024.20 |
container_title |
Annals of Glaciology |
container_start_page |
1 |
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10 |
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1810483409604050944 |