globalchange  > 气候变化与战略
DOI: 10.1029/2017GB005854
论文题名:
Aging and Molecular Changes of Dissolved Organic Matter Between Two Deep Oceanic End-Members
作者: Bercovici S.K.; Koch B.P.; Lechtenfeld O.J.; McCallister S.L.; Schmitt-Kopplin P.; Hansell D.A.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期:10
语种: 英语
学科: deep North Pacific ; dissolved organic matter ; molecular composition ; radiocarbon
中文摘要: The global ocean contains a massive reservoir of dissolved organic carbon (DOC), rivaling the atmosphere's pool of CO2. The most recalcitrant fractions have mean radiocarbon ages of ~4,000 years in the Atlantic to ~6,000 years in the Pacific. Knowing the radiocarbon signatures of DOC and the molecular composition of dissolved organic matter (DOM) is crucial to develop understanding of the persistence and lifetime of the DOC pool. In this research, we collected samples from the deep North Pacific in August 2013 (aboard the RV Melville) to couple the Δ14C content of solid-phase-extracted DOM (Δ14C-SPE-DOM) with its molecular composition in the ocean's oldest deep waters. We find that deep waters in this region held a mean Δ14C-SPE-DOM value of −554 ± 9‰ (~6,400 14C years), substantially more depleted than that in the deep Atlantic, which held a mean Δ14C-SPE-DOM value of −445 ± 5‰. While we find a more degraded molecular composition of DOM in the deep Pacific than the deep Atlantic, the molecular formulae within the Island of Stability (Lechtenfeld et al., 2014, https://doi.org/10.1016/j.gca.2013.11.009), are largely retained. These results imply that a fraction of deep DOM is resistant to removal and present in both the deep Atlantic and Pacific Oceans. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160194
Appears in Collections:气候变化与战略

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作者单位: Department of Ocean Sciences, RSMAS, University of Miami, Miami, FL, United States; Polar Science Center, University of Washington, Seattle, WA, United States; Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven, Germany; Department of Analytical Chemistry, UFZ-Helmholtz Centre for Environmental Research, Leipzig, Germany; Department of Biology, Center for Environmental Studies, Virginia Commonwealth University, Richmond, VA, United States; Helmholtz Zentrum München, Analytical BioGeoChemistry, Neuherberg, Germany; Analytical Food Chemistry, Technische Universität Muenchen, Freising/Weihenstephan, Germany

Recommended Citation:
Bercovici S.K.,Koch B.P.,Lechtenfeld O.J.,et al. Aging and Molecular Changes of Dissolved Organic Matter Between Two Deep Oceanic End-Members[J]. Global Biogeochemical Cycles,2018-01-01,32(10)
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