Pigment signatures of algal communities and their implications for glacier surface darkening.
Pigment signatures of algal communities and their implications for glacier surface darkening.
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DOI：
10.1038/s41598-022-22271-4
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发表时间：
2022-10-21
影响因子：
4.6
通讯作者：
Anesio, Alexandre M.
中科院分区：
文献类型：
--
作者：
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.
色素藻的大量繁殖使冰川和冰盖表面变暗，从而增强了太阳能的吸收，加速了冰雪的融化。藻类色素和群落组成对表面变暗的影响尚不清楚。本文研究了格陵兰岛东南部三座冰川的冰雪和裸冰表面上的冰川冰和雪藻类色素特征，并研究了它们在光生理和能量吸收中的作用。紫胆酸酯和虾青素酯在冰川冰雪藻色素池中占主导地位（与叶绿素a的质量比分别为32和56）。藻类生物量和色素影响显色性溶解有机物浓度。尽管在入射辐射峰值波长处虾青素酯的有效吸收，但由于色素包装，雪藻的细胞能量吸收比预期的低95%。因此，冰川冰藻的能量吸收提高了约5倍。在裸冰上，雪藻对总生物辐射强迫的贡献可能高达13%，尽管贡献了总生物量的44%。我们的研究结果为揭示融雪过程中藻类群落组成对裸冰能量吸收和生物量积累的影响提供了新的见解。
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.
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影响因子：
5.2
作者：
Christner, Brent C.;Lavender, Heather F.;Stone, William C.
通讯作者：
Stone, William C.
影响因子：
16.6
作者：
Irvine-Fynn TDL;Edwards A;Stevens IT;Mitchell AC;Bunting P;Box JE;Cameron KA;Cook JM;Naegeli K;Rassner SME;Ryan JC;Stibal M;Williamson CJ;Hubbard A
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Hubbard A
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5.2
作者：
Khan, Alia L.;Dierssen, Heidi M.;Cordero, Raul R.
通讯作者：
Cordero, Raul R.
影响因子：
4.2
作者：
Dial, Roman J.;Ganey, Gerard Q.;Skiles, S. McKenzie
通讯作者：
Skiles, S. McKenzie
影响因子：
4.6
作者：
Di Mauro, B.;Garzonio, R.;Rossini, M.
通讯作者：
Rossini, M.