Dynamics of organic matter in algal blooms on the Greenland ice sheet DOI Creative Commons
Pamela E. Rossel, Runa Antony, Rey Mourot

и другие.

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 10, 2025

Abstract Surface melting supports the development of pigmented algal blooms on Greenland Ice Sheet, decreasing albedo and further accelerating melting. The interplay between carbon-fixing algae carbon-respiring heterotrophic microorganisms ultimately controls amount composition organic matter (OM) thus ice snow color. Yet, dynamics microbially-derived OM Sheet remain unclear. To address this knowledge gap, we incubated in situ algae-dominated samples under light dark conditions characterized changes dissolved particulate (DOM POM) with help ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry. We show that glacier ice-algae habitats are dominated by highly unsaturated aromatic compounds resistant to bio- photo-degradation. In contrary, snow-algae enriched bioavailable more photosensitive aliphatics sulfur- phosphorus-containing compounds. both habitats, exposure increased water-soluble DOM derived from POM, which accounted for ~ 50–70% initial composition. Of DOM, 35–50% were heterotrophically degraded dark, while alone photodegraded 6–16%. significant accumulation light-absorbing aromatics POM at end experiments, underscore greater impact altering color

Язык: Английский

Dynamics of organic matter in algal blooms on the Greenland ice sheet DOI Creative Commons
Pamela E. Rossel, Runa Antony, Rey Mourot

и другие.

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 10, 2025

Abstract Surface melting supports the development of pigmented algal blooms on Greenland Ice Sheet, decreasing albedo and further accelerating melting. The interplay between carbon-fixing algae carbon-respiring heterotrophic microorganisms ultimately controls amount composition organic matter (OM) thus ice snow color. Yet, dynamics microbially-derived OM Sheet remain unclear. To address this knowledge gap, we incubated in situ algae-dominated samples under light dark conditions characterized changes dissolved particulate (DOM POM) with help ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry. We show that glacier ice-algae habitats are dominated by highly unsaturated aromatic compounds resistant to bio- photo-degradation. In contrary, snow-algae enriched bioavailable more photosensitive aliphatics sulfur- phosphorus-containing compounds. both habitats, exposure increased water-soluble DOM derived from POM, which accounted for ~ 50–70% initial composition. Of DOM, 35–50% were heterotrophically degraded dark, while alone photodegraded 6–16%. significant accumulation light-absorbing aromatics POM at end experiments, underscore greater impact altering color

Язык: Английский

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