globalchange  > 科学计划与规划
DOI: 10.1002/2016GL070359
论文题名:
Linked changes in marine dissolved organic carbon molecular size and radiocarbon age
作者: Walker B.D.; Primeau F.W.; Beaupré S.R.; Guilderson T.P.; Druffel E.R.M.; McCarthy M.D.
刊名: Geophysical Research Letters
ISSN: 0094-8536
EISSN: 1944-8267
出版年: 2016
卷: 43, 期:19
起始页码: 10385
结束页码: 10393
语种: 英语
英文关键词: dissolved organic carbon ; microbial carbon pump ; radiocarbon ; recalcitrance ; size reactivity ; ultrafiltration
Scopus关键词: Biochemistry ; Dissolution ; Stream flow ; Ultrafiltration ; Age distribution ; Carbon reservoirs ; Chemical compositions ; Dissolved organic carbon ; Microbial carbons ; Molecular size fraction ; Radiocarbon ; Recalcitrance ; Organic carbon
英文摘要: Marine dissolved organic carbon (DOC) is a major global carbon reservoir, yet its cycling remains poorly understood. Previous work suggests that DOC molecular size and chemical composition can significantly affect its bioavailability. Thus, DOC size and composition may control DOC cycling and radiocarbon age (via Δ14C). Here we show that DOC molecular size is correlated to DOC Δ14C in the Pacific Ocean. Our results, based on a series of increasing molecular size fractions from three depths in the Pacific, show increasing DOC Δ14C with increasing molecular size. We use a size-age distribution model to predict the DOC and Δ14C of ultrafiltered DOC. The model predicts both large and small surface DOC with high Δ14C and a narrow range (200–500 Da) of low Δ14C DOC. Deep model offsets suggest different size distributions and/or Δ14C sources at 670–915 m. Our results suggest that molecular size and composition are linked to DOC reactivity and storage in the ocean. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991466864&doi=10.1002%2f2016GL070359&partnerID=40&md5=b5dda016f328e3bd047e9e185c14536f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9499
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Department of Ocean Science, University of California, Santa Cruz, CA, United States

Recommended Citation:
Walker B.D.,Primeau F.W.,Beaupré S.R.,et al. Linked changes in marine dissolved organic carbon molecular size and radiocarbon age[J]. Geophysical Research Letters,2016-01-01,43(19).
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