气候变化领域集成服务门户(CCPortal): Atmospheric measurements of the terrestrial O2 : CO2 exchange ratio of a midlatitude forest

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DOI	10.5194/acp-19-8687-2019
	Atmospheric measurements of the terrestrial O2 : CO2 exchange ratio of a midlatitude forest
	Battle M.O.; William Munger J.; Conley M.; Sofen E.; Perry R.; Hart R.; Davis Z.; Scheckman J.; Woogerd J.; Graeter K.; Seekins S.; David S.; Carpenter J.
发表日期	2019
ISSN	16807316
起始页码	8687
结束页码	8701
卷号	19 期号:13
英文摘要	Measurements of atmospheric O2 have been used to quantify large-scale fluxes of carbon between the oceans, atmosphere and land since 1992 (Keeling and Shertz, 1992). With time, datasets have grown and estimates of fluxes have become more precise, but a key uncertainty in these calculations is the exchange ratio of O2 and CO2 associated with the net land carbon sink (B). We present measurements of atmospheric O2 and CO2 collected over a 6-year period from a mixed deciduous forest in central Massachusetts, USA (42.537 N, 72.171 W). Using a differential fuel-cellbased instrument for O2 and a nondispersive infrared analyzer for CO2, we analyzed airstreams collected within and 5m above the forest canopy. Averaged over the entire period of record, we find these two species covary with a slope of -1:081±0:007 mol of O2 per mole of CO2 (the mean and standard error of 6 h periods). If we limit the data to values collected on summer days within the canopy, the slope is -1:03±0:01. These are the conditions in which biotic influences are most likely to dominate. This result is significantly different from the value of -1.1 widely used in O2-based calculations of the global carbon budget, suggesting the need for a deeper understanding of the exchange ratios of the various fluxes and pools comprising the net sink. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric chemistry; carbon dioxide; carbon flux; carbon sink; forest canopy; midlatitude environment; oxygen; quantitative analysis; Massachusetts; United States
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144295
作者单位	Dept. of Physics and Astronomy, Bowdoin College, Brunswick, ME 04011-8488, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, United States
推荐引用方式 GB/T 7714	Battle M.O.,William Munger J.,Conley M.,et al. Atmospheric measurements of the terrestrial O2 : CO2 exchange ratio of a midlatitude forest[J],2019,19(13).
APA	Battle M.O..,William Munger J..,Conley M..,Sofen E..,Perry R..,...&Carpenter J..(2019).Atmospheric measurements of the terrestrial O2 : CO2 exchange ratio of a midlatitude forest.Atmospheric Chemistry and Physics,19(13).
MLA	Battle M.O.,et al."Atmospheric measurements of the terrestrial O2 : CO2 exchange ratio of a midlatitude forest".Atmospheric Chemistry and Physics 19.13(2019).