Earlier ice melt increases hypolimnetic oxygen despite regional warming in small Arctic lakes

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Václava Hazuková, Benjamin T. Burpee, Robert M. Northington, N. John Anderson, Jasmine E. Saros
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Abstract

Although trends toward earlier ice-out have been documented globally, the links between ice-out timing and lake thermal and biogeochemical structure vary spatially. In high-latitude lakes where ice-out occurs close to peak intensity of solar radiation, these links remain unclear. Using a long-term dataset from 13 lakes in West Greenland, we investigated how changing ice-out and weather conditions affect lake thermal structure and oxygen concentrations. In early ice-out years, lakes reach higher temperatures across the water column and have deeper epilimnia. Summer hypolimnia are the warmest (~ 11°C) in years when cooler air temperatures follow early ice-out, allowing full lake turnover. Due to the higher potential for substantive spring mixing in early ice-out years, a warmer hypolimnion is associated with higher dissolved oxygen concentrations. By affecting variability in spring mixing, the consequences of shifts in ice phenology for lakes at high latitudes differ from expectations based on temperate regions.

Abstract Image

尽管北极小湖泊出现区域性变暖,但冰层提前融化会增加下沉氧量
尽管全球范围内都出现了结冰时间提前的趋势,但结冰时间与湖泊热结构和生物地球化学结构之间的联系却因地而异。在高纬度湖泊中,结冰时间接近太阳辐射的峰值强度,这些联系仍不清楚。我们利用西格陵兰 13 个湖泊的长期数据集,研究了冰期和天气条件的变化如何影响湖泊热结构和氧气浓度。在冰期较早的年份,湖泊的整个水体温度较高,湖底较深。在早期结冰后气温较低的年份,夏季下垫面温度最高(约 11°C),使湖泊得以充分翻转。由于在冰期较早的年份,更有可能出现实质性的春季混合,因此较暖的下底层与较高的溶解氧浓度有关。通过影响春季混合的变化,冰期变化对高纬度地区湖泊的影响与温带地区的预期不同。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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