气候变化领域集成服务门户(CCPortal): Ancient low-molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw

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DOI	10.1073/pnas.1511705112
	Ancient low-molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw
	Drake T.W.; Wickland K.P.; Spencer R.G.M.; McKnight D.M.; Striegl R.G.
发表日期	2015
ISSN	0027-8424
起始页码	13946
结束页码	13951
卷号	112 期号:45
英文摘要	Northern permafrost soils store a vast reservoir of carbon, nearly twice that of the present atmosphere. Current and projected climate warming threatens widespread thaw of these frozen, organic carbon (OC)-rich soils. Upon thaw, mobilized permafrost OC in dissolved and particulate forms can enter streams and rivers, which are important processors of OC and conduits for carbon dioxide (CO2) to the atmosphere. Here, we demonstrate that ancient dissolved organic carbon (DOC) leached from 35,800 y B.P. permafrost soils is rapidly mineralized to CO2. During 200-h experiments in a novel high-Temporal-resolution bioreactor, DOC concentration decreased by an average of 53%, fueling a more than sevenfold increase in dissolved inorganic carbon (DIC) concentration. Eighty-seven percent of the DOC loss to microbial uptake was derived from the low-molecular-weight (LMW) organic acids acetate and butyrate. To our knowledge, our study is the first to directly quantify high CO2 production rates from permafrost-derived LMW DOC mineralization. The observed DOC loss rates are among the highest reported for permafrost carbon and demonstrate the potential importance of LMW DOC in driving the rapid metabolism of Pleistocene-Age permafrost carbon upon thawand the outgassing of CO2 to the atmosphere by soils and nearby inland waters.
语种	英语
scopus关键词	carbon dioxide; carboxylic acid; fuel; organic carbon; acid; carbon dioxide; organic compound; bacterial growth; biodegradability; biodegradation; climate change; Conference Paper; controlled study; fluorescence; leaching; microbial biomass; mineralization; molecular weight; permafrost; photochemistry; photooxidation; Pleistocene; priority journal; room temperature; soil; thawing; molecular weight; Acids; Carbon Dioxide; Molecular Weight; Organic Chemicals; Permafrost
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158979
作者单位	Drake, T.W., National Research Program, US Geological Survey, Boulder, CO 80303, United States, Environmental Studies Program, University of Colorado, Boulder, CO 80302, United States, Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States; Wickland, K.P., National Research Program, US Geological Survey, Boulder, CO 80303, United States; Spencer, R.G.M., Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States; McKnight, D.M., Environmental Studies Program, University of Colorado, Boulder, CO 80302, United States, Department of Civil, Environmental and Architectural Engineering, University of Colorado, Boulder, CO, United States; Striegl, R.G., National Research Program, US Geological Survey, Boulder, CO 80303, United States
推荐引用方式 GB/T 7714	Drake T.W.,Wickland K.P.,Spencer R.G.M.,et al. Ancient low-molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw[J],2015,112(45).
APA	Drake T.W.,Wickland K.P.,Spencer R.G.M.,McKnight D.M.,&Striegl R.G..(2015).Ancient low-molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw.Proceedings of the National Academy of Sciences of the United States of America,112(45).
MLA	Drake T.W.,et al."Ancient low-molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw".Proceedings of the National Academy of Sciences of the United States of America 112.45(2015).