Mineral phosphorus drives glacier algal blooms on the Greenland Ice Sheet.

Mineral phosphorus drives glacier algal blooms on the Greenland Ice Sheet.
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矿物磷驱动格陵兰冰盖上的冰川藻华。

DOI:
10.1038/s41467-020-20627-w
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发表时间:
2021-01-25
影响因子:
16.6
通讯作者:
Benning LG
Benning LG
中科院分区:
综合性期刊1区
文献类型:
--
作者:
McCutcheon J;Lutz S;Williamson C;Cook JM;Tedstone AJ;Vanderstraeten A;Wilson S;Stockdale A;Bonneville S;Anesio AM;Yallop ML;McQuaid JB;Tranter M;Benning LG

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格陵兰冰盖的融化是陆地冰质量损失和冰冻圈导致的海平面上升的主要原因。色素冰川冰藻的大量繁殖降低了冰的反照率,加速了冰盖西南部分的表面融化。虽然冰川冰藻造成了该地区13%的地表融化,但对水华发展的控制仍然知之甚少。在这里,我们通过对冰盖西南消融带地表栖息地中固体和流体相磷储层的量化,揭示了地表冰中矿物磷与冰川冰藻生物量之间的直接联系。我们证明了矿物粉尘中的营养物质可能驱动冰川冰藻的生长,从而确定矿物粉尘是冰盖融化的次要控制因素。格陵兰冰盖的融化——对海平面上升的威胁——由于冰藻的大量繁殖而加速。在这里,作者发现了矿物磷和冰川藻类之间的联系,表明来自灰尘的营养物质有助于水华的发展,从而影响冰盖的融化。
Melting of the Greenland Ice Sheet is a leading cause of land-ice mass loss and cryosphere-attributed sea level rise. Blooms of pigmented glacier ice algae lower ice albedo and accelerate surface melting in the ice sheet’s southwest sector. Although glacier ice algae cause up to 13% of the surface melting in this region, the controls on bloom development remain poorly understood. Here we show a direct link between mineral phosphorus in surface ice and glacier ice algae biomass through the quantification of solid and fluid phase phosphorus reservoirs in surface habitats across the southwest ablation zone of the ice sheet. We demonstrate that nutrients from mineral dust likely drive glacier ice algal growth, and thereby identify mineral dust as a secondary control on ice sheet melting. Melting of the Greenland Ice Sheet—a threat for sea level rise—is accelerated by ice algal blooms. Here the authors find a link between mineral phosphorus and glacier algae, indicating that dust-derived nutrients aid bloom development, thereby impacting ice sheet melting.
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