DOI: 10.1016/j.quascirev.2018.08.028
Scopus记录号: 2-s2.0-85053764628
论文题名: The approaching obsolescence of 137Cs dating of wetland soils in North America
作者: Drexler J.Z. ; Fuller C.C. ; Archfield S.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 199 起始页码: 83
结束页码: 96
语种: 英语
英文关键词: 137Cs mobility
; Anthropocene
; Best practices
; North America
; Radiogenic isotopes
; Uncertainty analysis
Scopus关键词: Carbon
; Deterioration
; Fallout
; Obsolescence
; Radioisotopes
; Reservoirs (water)
; River pollution
; Sea level
; Soils
; Uncertainty analysis
; Anthropocene
; Best practices
; Carbon sequestration
; Continental shelves
; Inter quartile ranges
; North America
; Radiogenic isotopes
; Sedimentary deposits
; Wetlands
; Anthropocene
; best management practice
; carbon sequestration
; cesium isotope
; dating method
; fallout
; radionuclide
; sea level change
; soil amendment
; soil pollution
; soil profile
; uncertainty analysis
; wetland
; Canada
; Mexico [North America]
; United States
英文摘要: The peak fallout in 1963 of the radionuclide 137Cs has been used to date lake, reservoir, continental shelf, and wetland sedimentary deposits. In wetlands such dating is used to project the ability of wetlands to keep pace with sea level rise and develop strategies for mitigating carbon pollution using biological carbon sequestration. Here we demonstrate that reliable 137Cs profiles are increasingly difficult to obtain from wetland soils. Among 58 soil cores recently collected from a range of wetland types and 137Cs fallout densities across the United States, 25% contain no identifiable 137Cs peaks. Less than 40% of 137Cs ages are consistent with 210Pb dating. We provide a new measure of 137Cs peak clarity (τ) for our core dataset by comparing the 50% interquartile range of data around the 137Cs peak for “ideal” cores profiles determined using 137Cs fallout data to that of observed core profiles. Our results show that overall τ is approximately 10 times greater for observed cores than ideal cores. The deterioration in the 137Cs peak has occurred due to radionuclide decay, 137Cs migration in situ, which is ubiquitous in this study, and 137Cs amendments from surface waters. Such deterioration likely extends to both Mexican and non-permafrost, Canadian wetlands. We recommend continued use of 137Cs only if the full bound of dating uncertainty for both 137Cs and an additional method such as 210Pb is propagated into estimates of wetland vertical accretion and carbon sequestration. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112038
Appears in Collections: 气候减缓与适应
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作者单位: U.S. Geological Survey, California Water Science Center, 6000 J Street, Placer Hall, Sacramento, CA 95819, United States; U.S. Geological Survey, 345 Middlefield Road, MS465, Menlo Park, CA 94025, United States; U.S. Geological Survey, Water Mission Area, MS430, 12201 Sunrise Valley Drive, Reston, VA 20192, United States
Recommended Citation:
Drexler J.Z.,Fuller C.C.,Archfield S.. The approaching obsolescence of 137Cs dating of wetland soils in North America[J]. Quaternary Science Reviews,2018-01-01,199