Modeling seasonal growth of phototrophs on bare ice on the Qaanaaq Ice Cap, northwestern Greenland
Modeling seasonal growth of phototrophs on bare ice on the Qaanaaq Ice Cap, northwestern Greenland
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模拟格陵兰岛西北部卡纳克冰盖裸冰上光养生物的季节性生长
DOI：
10.1017/jog.2022.76
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发表时间：
2022
影响因子：
3.4
通讯作者：
Aoki Teruo
中科院分区：
文献类型：
--
作者：
Onuma Yukihiko;Takeuchi Nozomu;Uetake Jun;Niwano Masashi;Tanaka Sota;Nagatsuka Naoko;Aoki Teruo
冰川光养生物在冰盖和冰川表面大量繁殖，导致冰川融化速度加快。2014年6月至8月，我们观察了格陵兰岛西北部Qaanaaq冰盖上光养生物丰度的季节变化，并使用数值和经验模型再现了这些变化。冰面上的光养生物群落主要由冰川微藻Ancylonema nordenskioldii和蓝藻Phormidesmis priestleyi组成。6月下旬，冰川在冰面上出现，此后其丰度在整个融化期间呈指数级增长。为雪藻生长设计的逻辑增长模型再现了测得的指数增长，这表明可以使用该模型作为冰融化持续时间的函数来解释生长。蓝藻出现，它们的丰度在7月下旬增加，但此后没有指数变化。蓝细菌的丰度解释了一个经验模型表示为裸冰表面上的矿物粉尘的量的函数。我们的数值和经验模型复制冰川藻类和蓝藻可能是有用的量化减少所造成的增长和格陵兰冰盖和冰川的融化率在未来的冰。
Glacier phototroph blooms on the surfaces of ice sheets and glaciers cause albedo reduction, leading to increased melting rates. We observed seasonal changes in the abundance of phototrophs on the Qaanaaq Ice Cap in northwestern Greenland from June to August 2014, and reproduced these changes using numerical and empirical models. The phototroph community on the ice surface mainly consisted of the glacier alga Ancylonema nordenskioldii and the cyanobacterium Phormidesmis priestleyi. The glacier alga appeared on the ice surface in late June, after which its abundance increased exponentially throughout the melting period. A logistic growth model designed for snow algal growth reproduced the measured exponential increases, suggesting that growth could be explained using the model as a function of the ice melting duration. Cyanobacteria appeared and their abundance increased in late July but did not change exponentially thereafter. The abundance of cyanobacteria was explained with an empirical model expressed as a function of the amount of mineral dust on the bare ice surface. Our numerical and empirical models for reproducing glacier algae and cyanobacteria could be useful for quantifying the albedo reduction caused by their growth and the melt rates of the Greenland ice sheet and glaciers in the future.