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; Hansen, Martin; Lund-Hansen, Lars C.; Markager, Stiig; Sorrell, Brian K.; Tranter, Martyn; Trivedi, Christopher B.; Winkel, Matthias; Anesio, Alexandre M.

doi:10.1038/s41598-022-22271-4

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Pigment signatures of algal communities and their implications for glacier surface darkening

Authors

Halbach, Laura
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Chevrollier, Lou-Anne
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Doting, Eva L.
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Cook, Joseph M.
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Jensen, Marie B.
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Benning, Liane G.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Bradley, James
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hansen, Martin
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Lund-Hansen, Lars C.
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Markager, Stiig
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Sorrell, Brian K.
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Tranter, Martyn
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Trivedi, Christopher B.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mwinkel

Winkel, Matthias
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Anesio, Alexandre M.
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Citation

Halbach, L., Chevrollier, L.-A., Doting, E. L., Cook, J. M., Jensen, M. B., Benning, L. G., Bradley, J., Hansen, M., Lund-Hansen, L. C., Markager, S., Sorrell, B. K., Tranter, M., Trivedi, C. B., Winkel, M., Anesio, A. M. (2022): Pigment signatures of algal communities and their implications for glacier surface darkening. - Scientific Reports, 12, 17643.
https://doi.org/10.1038/s41598-022-22271-4

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014322

Abstract

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.