Climate‐Driven Changes in Dissolved Organic Carbon and Water Clarity in Arctic Lakes of West Greenland
Climate‐Driven Changes in Dissolved Organic Carbon and Water Clarity in Arctic Lakes of West Greenland
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气候驱动的西格陵兰北极湖泊溶解有机碳和水清澈度的变化
DOI：
10.1029/2019jg005170
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
J. Saros
中科院分区：
文献类型：
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作者：
Rachel A. Fowler;C. Osburn;J. Saros
为了评估气候介导的北极湖泊陆水联系及其对光衰减和碳循环的潜在影响，我们评估了格陵兰岛西部两个不同气候模式地区湖泊对气候驱动因素的响应。我们选择了温暖干燥地区的四个湖泊，与格陵兰冰盖附近较冷潮湿地区的四个湖泊进行比较。2013年6月至2018年6月，我们测量了表层水温、1%深度光合有效辐射（PAR）、溶解有机碳（DOC）、特定紫外线吸收（SUVA254）、380 nm处DOC标准化吸收（a*380）和叶绿素a。在温暖干燥地区的湖泊，1% PAR和DOC的年际一致性特别高。这种一致性表明，北极湖泊特征的强迫是由一个大尺度驱动因素造成的，可能是气候。冗余分析表明，月平均降水、冬季北大西洋涛动（naao）指数、春季平均气温和春季平均降水对湖泊变量有影响（p = 0.003, R2 = 0.58）。月平均降水增加了土壤源DOC质量指标和叶绿素a，降低了1% PAR。湖泊对气候驱动因素响应的年际变化在温暖干燥地区比寒冷潮湿地区更为明显。与气候趋势相关的区域内和区域间湖泊年际响应表明，随着北极地区持续快速的气候变化，对光衰减和碳循环至关重要的关键湖泊响应可能会受到广泛影响。
To assess climate‐mediated terrestrial‐aquatic linkages in Arctic lakes and potential impacts on light attenuation and carbon cycling, we evaluated lake responses to climate drivers in two areas of west Greenland with differing climate patterns. We selected four lakes in a warmer, drier area to compare with four lakes from a cooler, wetter area proximal to the Greenland Ice Sheet. In June from 2013–2018, we measured epilimnetic water temperature, 1% depth of photosynthetically active radiation (PAR), dissolved organic carbon (DOC), specific ultraviolet absorbance (SUVA254), DOC‐normalized absorbance at 380 nm (a*380), and chlorophyll a. Interannual coherence of 1% PAR and DOC was particularly high for lakes within the warmer, drier area. This coherence suggests forcing of Arctic lake features by a large‐scale driver, likely climate. Redundancy analysis showed that monthly average precipitation, winter North Atlantic Oscillation (NAO) index (NAOW), spring average air temperature, and spring average precipitation influenced the lake variables (p = 0.003, adj. R2 = 0.58). In particular, monthly average precipitation contributed to increases in soil‐derived DOC quality metrics and chlorophyll a and decreased 1% PAR. Interannual changes in lake responses to climate drivers were more apparent in the warmer, drier area than the cooler, wetter area. The interannual lake responses within and between areas, associated with climate trends, suggest that with ongoing rapid climate change in the Arctic, there could be widespread impacts on key lake responses important for light attenuation and carbon cycling.