Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe
As part of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC), the HELiX uncrewed aircraft system (UAS) was deployed over the sea ice in the central Arctic Ocean during summer 2020. Albedo measurements were obtained with stabilized pyranometers, and melt pond fractio...
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crunicaliforniap:10.1525/elementa.2023.00001 2024-09-15T17:35:44+00:00 Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe Calmer, Radiance de Boer, Gijs Hamilton, Jonathan Lawrence, Dale Webster, Melinda A. Wright, Nicholas Shupe, Matthew D. Cox, Christopher J. Cassano, John J. 2023 http://dx.doi.org/10.1525/elementa.2023.00001 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2023.00001/781401/elementa.2023.00001.pdf en eng University of California Press http://creativecommons.org/licenses/by/4.0/ Elem Sci Anth volume 11, issue 1 ISSN 2325-1026 journal-article 2023 crunicaliforniap https://doi.org/10.1525/elementa.2023.00001 2024-08-22T04:14:21Z As part of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC), the HELiX uncrewed aircraft system (UAS) was deployed over the sea ice in the central Arctic Ocean during summer 2020. Albedo measurements were obtained with stabilized pyranometers, and melt pond fraction was calculated from orthomosaic imagery from a surface-imaging multispectral camera. This study analyzed HELiX flight data to provide insights on the temporal and spatial evolution of albedo and melt pond fraction of the MOSAiC floe during the melt season as it drifted south through Fram Strait. The surface albedo distributions showed peak values changing from high albedo (0.55–0.6) to lower values (0.3) as the season advanced. Inspired by methods developed for satellite data, an algorithm was established to retrieve melt pond fraction from the orthomosaic images. We demonstrate that the near-surface observations of melt pond fraction were highly dependent on sample area, offering insight into the influence of subgrid scale features and spatial heterogeneity in satellite observations. Vertical observations conducted with the HELiX were used to quantify the influence of melt pond scales on observed surface albedo as a function of sensor footprint. These scaling results were used to link surface-based measurements collected during MOSAiC to broader-scale satellite data to investigate the influence of surface features on observed albedo. Albedo values blend underlying features within the sensor footprint, as determined by the melt pond size and concentration. This study framed the downscaling (upscaling) problem related to the airborne (surface) observations of surface albedo across a variety of spatial scales. Article in Journal/Newspaper albedo Arctic Ocean Fram Strait Sea ice University of California Press Elem Sci Anth 11 1 |
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Open Polar |
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University of California Press |
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crunicaliforniap |
language |
English |
description |
As part of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC), the HELiX uncrewed aircraft system (UAS) was deployed over the sea ice in the central Arctic Ocean during summer 2020. Albedo measurements were obtained with stabilized pyranometers, and melt pond fraction was calculated from orthomosaic imagery from a surface-imaging multispectral camera. This study analyzed HELiX flight data to provide insights on the temporal and spatial evolution of albedo and melt pond fraction of the MOSAiC floe during the melt season as it drifted south through Fram Strait. The surface albedo distributions showed peak values changing from high albedo (0.55–0.6) to lower values (0.3) as the season advanced. Inspired by methods developed for satellite data, an algorithm was established to retrieve melt pond fraction from the orthomosaic images. We demonstrate that the near-surface observations of melt pond fraction were highly dependent on sample area, offering insight into the influence of subgrid scale features and spatial heterogeneity in satellite observations. Vertical observations conducted with the HELiX were used to quantify the influence of melt pond scales on observed surface albedo as a function of sensor footprint. These scaling results were used to link surface-based measurements collected during MOSAiC to broader-scale satellite data to investigate the influence of surface features on observed albedo. Albedo values blend underlying features within the sensor footprint, as determined by the melt pond size and concentration. This study framed the downscaling (upscaling) problem related to the airborne (surface) observations of surface albedo across a variety of spatial scales. |
format |
Article in Journal/Newspaper |
author |
Calmer, Radiance de Boer, Gijs Hamilton, Jonathan Lawrence, Dale Webster, Melinda A. Wright, Nicholas Shupe, Matthew D. Cox, Christopher J. Cassano, John J. |
spellingShingle |
Calmer, Radiance de Boer, Gijs Hamilton, Jonathan Lawrence, Dale Webster, Melinda A. Wright, Nicholas Shupe, Matthew D. Cox, Christopher J. Cassano, John J. Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
author_facet |
Calmer, Radiance de Boer, Gijs Hamilton, Jonathan Lawrence, Dale Webster, Melinda A. Wright, Nicholas Shupe, Matthew D. Cox, Christopher J. Cassano, John J. |
author_sort |
Calmer, Radiance |
title |
Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
title_short |
Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
title_full |
Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
title_fullStr |
Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
title_full_unstemmed |
Relationships between summertime surface albedo and melt pond fraction in the central Arctic Ocean: The aggregate scale of albedo obtained on the MOSAiC floe |
title_sort |
relationships between summertime surface albedo and melt pond fraction in the central arctic ocean: the aggregate scale of albedo obtained on the mosaic floe |
publisher |
University of California Press |
publishDate |
2023 |
url |
http://dx.doi.org/10.1525/elementa.2023.00001 https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2023.00001/781401/elementa.2023.00001.pdf |
genre |
albedo Arctic Ocean Fram Strait Sea ice |
genre_facet |
albedo Arctic Ocean Fram Strait Sea ice |
op_source |
Elem Sci Anth volume 11, issue 1 ISSN 2325-1026 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1525/elementa.2023.00001 |
container_title |
Elem Sci Anth |
container_volume |
11 |
container_issue |
1 |
_version_ |
1810476186087718912 |