Arctic river temperature dynamics in a changing climate
Arctic river temperature dynamics in a changing climate
复制标题
气候变化下的北极河流温度动态
DOI：
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
D. Hannah
中科院分区：
文献类型：
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作者：
Catherine L. Docherty;S. Dugdale;A. Milner;J. Abermann;M. Lund;D. Hannah
预计北极的气候变化将对河流生态系统产生重大影响，影响到水文和热状况。虽然温度对一系列流内过程很重要，但以前的北极流温度研究有限，主要集中在夏季冰川化的源头，对融雪流和冬季的关注有限。这是格陵兰东北部（Zackenberg）河流温度的首次高分辨率研究。从2013年9月至2015年9月（24个月）的5个数据流中收集数据。在冬季，溪流大部分被冻成固体，水温变化很小。春季冰关闭日期在所有溪流中同时发生，但由于较厚的雪绝缘，2014年比2015年提前了11天。在夏季，水温变化很大，与气象变量，特别是入射短波辐射和气温有很强的关系。夏季平均水温在这些融雪流高相比，以前在斯瓦尔巴群岛研究的流，但在瑞典拉普兰较低，预计给定的纬度。随着全球变暖，北极河流的热变率在夏季可能会减少，而在冬季则会增加，这是由于夏季气温较高和冬季降水量增加，春季和秋季的结冰和封冻日期可能会延长流水季节，从而影响河流的生产力和多样性。
Climate change in the Arctic is expected to have a major impact on stream ecosystems, affecting hydrological and thermal regimes. Although temperature is important to a range of in‐stream processes, previous Arctic stream temperature research is limited—focused on glacierised headwaters in summer—with limited attention to snowmelt streams and winter. This is the first high‐resolution study on stream temperature in north‐east Greenland (Zackenberg). Data were collected from five streams from September 2013 to September 2015 (24 months). During the winter, streams were largely frozen solid and water temperature variability low. Spring ice‐off date occurred simultaneously across all streams, but 11 days earlier in 2014 compared with 2015 due to thicker snow insulation. During summer, water temperature was highly variable and exhibited a strong relationship with meteorological variables, particularly incoming shortwave radiation and air temperature. Mean summer water temperature in these snowmelt streams was high compared with streams studied previously in Svalbard, yet was lower in Swedish Lapland, as was expected given latitude. With global warning, Arctic stream thermal variability may be less in summer and increased during the winter due to higher summer air temperature and elevated winter precipitation, and the spring and autumn ice‐on and ice‐off dates may extend the flowing water season—in turn affecting stream productivity and diversity.
影响因子：
30.7
作者：
Jacobsen, Dean;Milner, Alexander M.;Dangles, Olivier
通讯作者：
Dangles, Olivier