气候变化领域集成服务门户(CCPortal): Climate, snowmelt dynamics and atmospheric deposition interact to control dissolved organic carbon export from a northern forest stream over 26 years

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DOI	10.1088/1748-9326/ab9c4e
	Climate, snowmelt dynamics and atmospheric deposition interact to control dissolved organic carbon export from a northern forest stream over 26 years
	Meingast K.M.; Kane E.S.; Coble A.A.; Marcarelli A.M.; Toczydlowski D.
发表日期	2020
ISSN	17489318
卷号	15 期号:10
英文摘要	Increasing concentrations of dissolved organic carbon (DOC) have been identified in many freshwater systems over the last three decades. Studies have generally nominated atmospheric deposition as the key driver of this trend, with changes in climatic factors also contributing. However, there is still much uncertainty concerning net effects of these drivers on DOC concentrations and export dynamics. Changes in climate and climate mediated snowfall dynamics in northern latitudes have not been widely considered as causal factors of changes in long-term DOC trends, despite their disproportionate role in annual DOC export. We leveraged long-term datasets (1988–2013) from a first-order forested tributary of Lake Superior to understand causal factors of changes in DOC concentrations and exports from the watershed, by simultaneously evaluating atmospheric deposition, temperature, snowmelt timing, and runoff. We observed increases in DOC concentrations of approximately 0.14 mg C l−1 yr−1 (mean = 8.12 mg C l−1) that were related with declines in sulfate deposition (0.03 mg SO24− l−1 yr−1). Path analysis revealed that DOC exports were driven by runoff related to snowmelt, with peak snow water equivalences generally being lower and less variable in the 21st century, compared with the 1980s and 1990s. Mean temperatures were negatively related (direct effects) to maximum snow water equivalences (−0.71), and in turn had negative effects on DOC concentrations (−0.58), the timing of maximum discharge (−0.89) and DOC exports (indirect effect, −0.41). Based on these trends, any future changes in climate that lessen the dominance of snowmelt on annual runoff dynamics—including an earlier peak discharge—would decrease annual DOC export in snowmelt dominated systems. Together, these findings further illustrate complex interactions between climate and atmospheric deposition in carbon cycle processes, and highlight the importance of long-term monitoring efforts for understanding the consequences of a changing climate. © 2020 The Author(s). Published by IOP Publishing Ltd
英文关键词	Dissolved organic carbon; Snowmelt; Stream export; Surface water browning
语种	英语
scopus关键词	Atmospheric chemistry; Deposition; Forestry; Lakes; Meteorological problems; Organic carbon; Regression analysis; Runoff; Snow; Snow melting systems; Stream flow; Sulfur compounds; Atmospheric depositions; Carbon cycle process; Dissolved organic carbon; DOC concentrations; Freshwater systems; Long term monitoring; Northern latitudes; Snow water equivalence; Climate change; atmospheric deposition; carbon cycle; climate change; complexity; dissolved organic carbon; peak discharge; runoff; snow water equivalent; snowmelt; stream; Great Lakes [North America]; Lake Superior
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153546
作者单位	Michigan Technological University, College of Forest Resources and Environmental Science, Houghton, MI, United States; USDA Forest Service, Northern Research Station, Houghton, MI, United States; National Council for Air and Stream Improvement, Inc., Corvallis, OR, United States; Department of Biological Sciences, Michigan Technological University, Houghton, MI, United States
推荐引用方式 GB/T 7714	Meingast K.M.,Kane E.S.,Coble A.A.,et al. Climate, snowmelt dynamics and atmospheric deposition interact to control dissolved organic carbon export from a northern forest stream over 26 years[J],2020,15(10).
APA	Meingast K.M.,Kane E.S.,Coble A.A.,Marcarelli A.M.,&Toczydlowski D..(2020).Climate, snowmelt dynamics and atmospheric deposition interact to control dissolved organic carbon export from a northern forest stream over 26 years.Environmental Research Letters,15(10).
MLA	Meingast K.M.,et al."Climate, snowmelt dynamics and atmospheric deposition interact to control dissolved organic carbon export from a northern forest stream over 26 years".Environmental Research Letters 15.10(2020).