Pigment signatures of algal communities and their implications for glacier surface darkening.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
21 10 2022
21 10 2022
Historique:
received:
04
03
2022
accepted:
12
10
2022
pubmed:
23
10
2022
medline:
26
10
2022
entrez:
22
10
2022
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 36271236
doi: 10.1038/s41598-022-22271-4
pii: 10.1038/s41598-022-22271-4
pmc: PMC9587043
doi:
Substances chimiques
Chlorophyll A
YF5Q9EJC8Y
astaxanthine
8XPW32PR7I
Esters
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
17643Subventions
Organisme : European Research Council
ID : 856416
Pays : International
Informations de copyright
© 2022. The Author(s).
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