Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores
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 tha...
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ftunivtasmania:oai:eprints.utas.edu.au:35716 2023-05-15T18:17:19+02:00 Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores Cimoli, E Lucieer, V Meiners, KM Chennu, A Castrisios, K Ryan, KG Lund-Hansen, LC Martin, A Kennedy, F Lucieer, A 2020 application/pdf https://eprints.utas.edu.au/35716/ https://eprints.utas.edu.au/35716/1/142129%20-%20Mapping%20the%20in%20situ%20microspatial%20distribution%20of%20ice%20algal%20biomass.pdf en eng Nature Publishing Group https://eprints.utas.edu.au/35716/1/142129%20-%20Mapping%20the%20in%20situ%20microspatial%20distribution%20of%20ice%20algal%20biomass.pdf Cimoli, E orcid:0000-0001-7964-2716 , Lucieer, V orcid:0000-0001-7531-5750 , Meiners, KM, Chennu, A, Castrisios, K, Ryan, KG, Lund-Hansen, LC, Martin, A orcid:0000-0001-8260-5529 , Kennedy, F orcid:0000-0003-1796-0764 and Lucieer, A orcid:0000-0002-9468-4516 2020 , 'Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores' , Scientific Reports, vol. 10, no. 1 , pp. 1-17 , doi:10.1038/s41598-020-79084-6 <http://dx.doi.org/10.1038/s41598-020-79084-6>. hyperspectral sea-ice Article PeerReviewed 2020 ftunivtasmania https://doi.org/10.1038/s41598-020-79084-6 2021-02-22T23:16:27Z 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 (R2 ≤ 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 University of Tasmania: UTas ePrints Scientific Reports 10 1 |
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Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
hyperspectral sea-ice |
spellingShingle |
hyperspectral sea-ice Cimoli, E Lucieer, V Meiners, KM Chennu, A Castrisios, K Ryan, KG Lund-Hansen, LC Martin, A Kennedy, F Lucieer, A Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores |
topic_facet |
hyperspectral sea-ice |
description |
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 (R2 ≤ 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. |
format |
Article in Journal/Newspaper |
author |
Cimoli, E Lucieer, V Meiners, KM Chennu, A Castrisios, K Ryan, KG Lund-Hansen, LC Martin, A Kennedy, F Lucieer, A |
author_facet |
Cimoli, E Lucieer, V Meiners, KM Chennu, A Castrisios, K Ryan, KG Lund-Hansen, LC Martin, A Kennedy, F Lucieer, A |
author_sort |
Cimoli, E |
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 |
Nature Publishing Group |
publishDate |
2020 |
url |
https://eprints.utas.edu.au/35716/ https://eprints.utas.edu.au/35716/1/142129%20-%20Mapping%20the%20in%20situ%20microspatial%20distribution%20of%20ice%20algal%20biomass.pdf |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://eprints.utas.edu.au/35716/1/142129%20-%20Mapping%20the%20in%20situ%20microspatial%20distribution%20of%20ice%20algal%20biomass.pdf Cimoli, E orcid:0000-0001-7964-2716 , Lucieer, V orcid:0000-0001-7531-5750 , Meiners, KM, Chennu, A, Castrisios, K, Ryan, KG, Lund-Hansen, LC, Martin, A orcid:0000-0001-8260-5529 , Kennedy, F orcid:0000-0003-1796-0764 and Lucieer, A orcid:0000-0002-9468-4516 2020 , 'Mapping the in situ microspatial distribution of ice algal biomass through hyperspectral imaging of sea-ice cores' , Scientific Reports, vol. 10, no. 1 , pp. 1-17 , doi:10.1038/s41598-020-79084-6 <http://dx.doi.org/10.1038/s41598-020-79084-6>. |
op_doi |
https://doi.org/10.1038/s41598-020-79084-6 |
container_title |
Scientific Reports |
container_volume |
10 |
container_issue |
1 |
_version_ |
1766191463949926400 |