Pigment signatures of algal communities and their implications for glacier surface darkening
Blooms of pigmented algae darken the surface of glaciers and ice sheets, thereby enhancing solar energy absorption and amplifying ice and snow melt. The impacts of algal pigment and community composition on surface darkening are still poorly understood. Here, we characterise glacier ice and snow alg...
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ftpubmed:oai:pubmedcentral.nih.gov:9587043 2023-05-15T16:21:14+02:00 Pigment signatures of algal communities and their implications for glacier surface darkening Halbach, Laura Chevrollier, Lou-Anne Doting, Eva L. Cook, Joseph M. Jensen, Marie B. Benning, Liane G. Bradley, James A. Hansen, Martin Lund-Hansen, Lars C. Markager, Stiig Sorrell, Brian K. Tranter, Martyn Trivedi, Christopher B. Winkel, Matthias Anesio, Alexandre M. 2022-10-21 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9587043/ http://www.ncbi.nlm.nih.gov/pubmed/36271236 https://doi.org/10.1038/s41598-022-22271-4 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9587043/ http://www.ncbi.nlm.nih.gov/pubmed/36271236 http://dx.doi.org/10.1038/s41598-022-22271-4 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Sci Rep Article Text 2022 ftpubmed https://doi.org/10.1038/s41598-022-22271-4 2022-10-30T00:37:37Z Blooms of pigmented algae darken the surface of glaciers and ice sheets, thereby enhancing solar energy absorption and amplifying ice and snow melt. The impacts of algal pigment and community composition on surface darkening are still poorly understood. Here, we characterise glacier ice and snow algal pigment signatures on snow and bare ice surfaces and study their role in photophysiology and energy absorption on three glaciers in Southeast Greenland. Purpurogallin and astaxanthin esters dominated the glacier ice and snow algal pigment pools (mass ratios to chlorophyll a of 32 and 56, respectively). Algal biomass and pigments impacted chromophoric dissolved organic matter concentrations. Despite the effective absorption of astaxanthin esters at wavelengths where incoming irradiance peaks, the cellular energy absorption of snow algae was 95% lower than anticipated from their pigmentation, due to pigment packaging. The energy absorption of glacier ice algae was consequently ~ 5 × higher. On bare ice, snow algae may have locally contributed up to 13% to total biological radiative forcing, despite contributing 44% to total biomass. Our results give new insights into the impact of algal community composition on bare ice energy absorption and biomass accumulation during snow melt. Text glacier Greenland ice algae PubMed Central (PMC) Greenland Scientific Reports 12 1 |
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Article Halbach, Laura Chevrollier, Lou-Anne Doting, Eva L. Cook, Joseph M. Jensen, Marie B. Benning, Liane G. Bradley, James A. Hansen, Martin Lund-Hansen, Lars C. Markager, Stiig Sorrell, Brian K. Tranter, Martyn Trivedi, Christopher B. Winkel, Matthias Anesio, Alexandre M. Pigment signatures of algal communities and their implications for glacier surface darkening |
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description |
Blooms of pigmented algae darken the surface of glaciers and ice sheets, thereby enhancing solar energy absorption and amplifying ice and snow melt. The impacts of algal pigment and community composition on surface darkening are still poorly understood. Here, we characterise glacier ice and snow algal pigment signatures on snow and bare ice surfaces and study their role in photophysiology and energy absorption on three glaciers in Southeast Greenland. Purpurogallin and astaxanthin esters dominated the glacier ice and snow algal pigment pools (mass ratios to chlorophyll a of 32 and 56, respectively). Algal biomass and pigments impacted chromophoric dissolved organic matter concentrations. Despite the effective absorption of astaxanthin esters at wavelengths where incoming irradiance peaks, the cellular energy absorption of snow algae was 95% lower than anticipated from their pigmentation, due to pigment packaging. The energy absorption of glacier ice algae was consequently ~ 5 × higher. On bare ice, snow algae may have locally contributed up to 13% to total biological radiative forcing, despite contributing 44% to total biomass. Our results give new insights into the impact of algal community composition on bare ice energy absorption and biomass accumulation during snow melt. |
format |
Text |
author |
Halbach, Laura Chevrollier, Lou-Anne Doting, Eva L. Cook, Joseph M. Jensen, Marie B. Benning, Liane G. Bradley, James A. Hansen, Martin Lund-Hansen, Lars C. Markager, Stiig Sorrell, Brian K. Tranter, Martyn Trivedi, Christopher B. Winkel, Matthias Anesio, Alexandre M. |
author_facet |
Halbach, Laura Chevrollier, Lou-Anne Doting, Eva L. Cook, Joseph M. Jensen, Marie B. Benning, Liane G. Bradley, James A. Hansen, Martin Lund-Hansen, Lars C. Markager, Stiig Sorrell, Brian K. Tranter, Martyn Trivedi, Christopher B. Winkel, Matthias Anesio, Alexandre M. |
author_sort |
Halbach, Laura |
title |
Pigment signatures of algal communities and their implications for glacier surface darkening |
title_short |
Pigment signatures of algal communities and their implications for glacier surface darkening |
title_full |
Pigment signatures of algal communities and their implications for glacier surface darkening |
title_fullStr |
Pigment signatures of algal communities and their implications for glacier surface darkening |
title_full_unstemmed |
Pigment signatures of algal communities and their implications for glacier surface darkening |
title_sort |
pigment signatures of algal communities and their implications for glacier surface darkening |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9587043/ http://www.ncbi.nlm.nih.gov/pubmed/36271236 https://doi.org/10.1038/s41598-022-22271-4 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland ice algae |
genre_facet |
glacier Greenland ice algae |
op_source |
Sci Rep |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9587043/ http://www.ncbi.nlm.nih.gov/pubmed/36271236 http://dx.doi.org/10.1038/s41598-022-22271-4 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-022-22271-4 |
container_title |
Scientific Reports |
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12 |
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1 |
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1766009241574834176 |