High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole
High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole
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DOI：
10.1002/hyp.8049
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发表时间：
2011-08-30
影响因子：
3.2
通讯作者：
Mowlem, M.
中科院分区：
文献类型：
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作者：
Bagshaw, E. A.;Tranter, M.;Mowlem, M.
这项研究首次提供了在南极洲麦克默多干河谷加拿大冰川上冰盖的冷石洞中测量溶解氧(DO)的高分辨率数据集。在季节性内部融化和与地下排水系统的水文连接之前，光纤DO微型传感器被安装在一个冷凝孔中。冰锥岩孔中的氧气空气饱和度通常在50%到80%之间，与之前的单一测量结果基本一致，表明净呼吸(R)。这与野外进行的简单孵化实验结果一致。在为期四周的研究期间，电导率、水温和DO的同时时间序列提供了有关冷凝孔与近地表排水系统的连通性的信息。观测到的溶解氧变化的主要驱动因素可能是周期性的熔融-冻结循环。我们的结论是，如本文所述的自动传感技术，当与物理测量结合使用时，在高分辨率监测扰乱冰冻圈表面水生生态系统生物地球化学过程的因素方面具有巨大潜力。版权所有(C)2011 John Wiley&Sons，Ltd.
This study presents the first high-resolution dataset of dissolved oxygen (DO) measurements in an ice-lidded cryoconite hole on Canada Glacier, McMurdo Dry Valleys, Antarctica. Fibre optic DO minisensors were installed in a cryoconite hole prior to seasonal internal melting and hydrological connection to the subsurface drainage system. Oxygen air saturation in the cryoconite hole typically ranged from 50 to 80%, in broad agreement with previous single measurements, indicating net respiration (R). This is consistent with results of simple incubation experiments performed in the field. Simultaneous time series for electrical conductivity, water temperature, and DO over the four-week study period provide information regarding the connectivity of cryoconite holes with the near-surface drainage system. The main driver of the observed variations in DO is likely to be periodic melt-freeze cycles. We conclude that automated sensing techniques, such as those described here, when used in conjunction with physical measurements, have great potential for high-resolution monitoring of the factors that perturb biogeochemical processes in cryospheric surface aquatic ecosystems. Copyright (C) 2011 John Wiley & Sons, Ltd.