Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores
Abstract Ice-associated microalgae make a significant seasonal contribution to primary production and biogeochemical cycling in polar regions. However, the distribution of algal cells is driven by strong physicochemical gradients which lead to a degree of microspatial variability in the microbial bi...
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Springer Science and Business Media LLC
2020
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Online Access: | http://dx.doi.org/10.1038/s41598-020-79084-6 http://www.nature.com/articles/s41598-020-79084-6.pdf http://www.nature.com/articles/s41598-020-79084-6 |
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crspringernat:10.1038/s41598-020-79084-6 2023-05-15T18:17:32+02:00 Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores Cimoli, Emiliano Lucieer, Vanessa Meiners, Klaus M. Chennu, Arjun Castrisios, Katerina Ryan, Ken G. Lund-Hansen, Lars Chresten Martin, Andrew Kennedy, Fraser Lucieer, Arko Australian Research Council New Zealand Antarctic Research Institute 2020 http://dx.doi.org/10.1038/s41598-020-79084-6 http://www.nature.com/articles/s41598-020-79084-6.pdf http://www.nature.com/articles/s41598-020-79084-6 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 10, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2020 crspringernat https://doi.org/10.1038/s41598-020-79084-6 2022-01-04T12:32:24Z Abstract Ice-associated microalgae make a significant seasonal contribution to primary production and biogeochemical cycling in polar regions. However, the distribution of algal cells is driven by strong physicochemical gradients which lead to a degree of microspatial variability in the microbial biomass that is significant, but difficult to quantify. We address this methodological gap by employing a field-deployable hyperspectral scanning and photogrammetric approach to study sea-ice cores. The optical set-up facilitated unsupervised mapping of the vertical and horizontal distribution of phototrophic biomass in sea-ice cores at mm-scale resolution (using chlorophyll a [Chl a ] as proxy), and enabled the development of novel spectral indices to be tested against extracted Chl a (R 2 ≤ 0.84). The modelled bio-optical relationships were applied to hyperspectral imagery captured both in situ (using an under-ice sliding platform) and ex situ (on the extracted cores) to quantitatively map Chl a in mg m −2 at high-resolution (≤ 2.4 mm). The optical quantification of Chl a on a per-pixel basis represents a step-change in characterising microspatial variation in the distribution of ice-associated algae. This study highlights the need to increase the resolution at which we monitor under-ice biophysical systems, and the emerging capability of hyperspectral imaging technologies to deliver on this research goal. Article in Journal/Newspaper Sea ice Springer Nature (via Crossref) Scientific Reports 10 1 |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Multidisciplinary |
spellingShingle |
Multidisciplinary Cimoli, Emiliano Lucieer, Vanessa Meiners, Klaus M. Chennu, Arjun Castrisios, Katerina Ryan, Ken G. Lund-Hansen, Lars Chresten Martin, Andrew Kennedy, Fraser Lucieer, Arko Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
topic_facet |
Multidisciplinary |
description |
Abstract Ice-associated microalgae make a significant seasonal contribution to primary production and biogeochemical cycling in polar regions. However, the distribution of algal cells is driven by strong physicochemical gradients which lead to a degree of microspatial variability in the microbial biomass that is significant, but difficult to quantify. We address this methodological gap by employing a field-deployable hyperspectral scanning and photogrammetric approach to study sea-ice cores. The optical set-up facilitated unsupervised mapping of the vertical and horizontal distribution of phototrophic biomass in sea-ice cores at mm-scale resolution (using chlorophyll a [Chl a ] as proxy), and enabled the development of novel spectral indices to be tested against extracted Chl a (R 2 ≤ 0.84). The modelled bio-optical relationships were applied to hyperspectral imagery captured both in situ (using an under-ice sliding platform) and ex situ (on the extracted cores) to quantitatively map Chl a in mg m −2 at high-resolution (≤ 2.4 mm). The optical quantification of Chl a on a per-pixel basis represents a step-change in characterising microspatial variation in the distribution of ice-associated algae. This study highlights the need to increase the resolution at which we monitor under-ice biophysical systems, and the emerging capability of hyperspectral imaging technologies to deliver on this research goal. |
author2 |
Australian Research Council New Zealand Antarctic Research Institute |
format |
Article in Journal/Newspaper |
author |
Cimoli, Emiliano Lucieer, Vanessa Meiners, Klaus M. Chennu, Arjun Castrisios, Katerina Ryan, Ken G. Lund-Hansen, Lars Chresten Martin, Andrew Kennedy, Fraser Lucieer, Arko |
author_facet |
Cimoli, Emiliano Lucieer, Vanessa Meiners, Klaus M. Chennu, Arjun Castrisios, Katerina Ryan, Ken G. Lund-Hansen, Lars Chresten Martin, Andrew Kennedy, Fraser Lucieer, Arko |
author_sort |
Cimoli, Emiliano |
title |
Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
title_short |
Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
title_full |
Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
title_fullStr |
Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
title_full_unstemmed |
Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
title_sort |
mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
http://dx.doi.org/10.1038/s41598-020-79084-6 http://www.nature.com/articles/s41598-020-79084-6.pdf http://www.nature.com/articles/s41598-020-79084-6 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Scientific Reports volume 10, issue 1 ISSN 2045-2322 |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41598-020-79084-6 |
container_title |
Scientific Reports |
container_volume |
10 |
container_issue |
1 |
_version_ |
1766191831627857920 |