Topographic shading influences cryoconite morphodynamics and carbon exchange
Topographic shading influences cryoconite morphodynamics and carbon exchange
复制标题
DOI：
10.1080/15230430.2017.1414463
复制
发表时间：
2018-03-13
影响因子：
2
通讯作者：
Edwards, A.
中科院分区：
文献类型：
--
作者：
Cook, J. M.;Sweet, M.;Edwards, A.
冰柱洞是冰川和冰盖表面最活跃和最多样化的微生物栖息地。在这篇文章中，作者证明了冰尘孔的形状取决于冰表面地形，这对碳循环制度的影响。净生态系统生产被证明主要是由孔内的沉积物厚度。作者表明，不规则的孔洞形状表明孔洞迁移远离地形阴影，这促进了冰面上中尺度的碳固定。一个元胞自动机结合沉积物输送实验表明，迁移是简单的沉积物转移过程的结果，这意味着冰表面的演变和cryoconite地球化学，以前没有被检查之间的关系。
Cryoconite holes are the most active and diverse microbial habitats on glacier and ice-sheet surfaces. In this article the authors demonstrate that the shape of cryoconite holes varies depending on ice-surface topography and that this has implications for the carbon cycling regime within. Net ecosystem production is shown to be controlled primarily by sediment thickness within holes. The authors show that irregular hole shapes are indicative of hole migration away from topographic shade, which promotes carbon fixation at the mesoscale on ice surfaces. A cellular automaton is used in conjunction with sediment-delivery experiments to show that migration is the result of simple sediment transfer processes, implying a relationship between ice-surface evolution and cryoconite biogeochemistry that has not previously been examined.