DOI: 10.1002/2014GL061993
论文题名: Particulate δ15N in laminated marine sediments as a proxy for mixing between the California Undercurrent and the California Current: A proof of concept
作者: Tems C.E. ; Berelson W.M. ; Prokopenko M.G.
刊名: Geophysical Research Letters
ISSN: 0094-9050
EISSN: 1944-8781
出版年: 2015
卷: 42, 期: 2 起始页码: 419
结束页码: 427
语种: 英语
英文关键词: anoxic sediments
; California Undercurrent
; denitrification
; N isotopes
; Pacific Decadal Oscillation
Scopus关键词: Denitrification
; Isotopes
; Sediments
; Submarine geology
; California
; California Current
; Laminated sediments
; N isotopes
; Ocean circulation
; Oxygen minimum zone
; Pacific decadal oscillation
; Southern California
; Anoxic sediments
; coastal zone
; denitrification
; marine sediment
; nutrient dynamics
; proxy climate record
; salinity
; undercurrent
; water column
; California Current
; Pacific Ocean
英文摘要: The measurements of particulate δ15N in coastal marine laminated sediments provide a high-resolution proxy for fluctuations in the intensity of denitrification in the water column. In the eastern tropical North Pacific oxygen minimum zone, this denitrification signal is transported northward by the California Undercurrent, thus serving as a tracer of ocean circulation. This is verified through comparisons between salinity in the thermocline off Southern California (Santa Monica Basin) and the difference between δ15Nsed within age equivalent sediments from a southern (Pescadero Slope) and northern (Santa Monica Basin) site. Trends in this parameter, Δδ15Nsed, relate to Pacific Decadal Oscillation (PDO) phase changes between 1900 and 1990. We hypothesize that the decline in Δδ15Nsed during warm PDO phases is due to a strengthening of the California Undercurrent transporting 15N-enriched nitrate from the eastern tropical North Pacific northward. The deviation from this trend after 1990 suggests recent changes in circulation and/or California Current water nutrient biogeochemistry. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923607977&doi=10.1002%2f2014GL061993&partnerID=40&md5=3bafa96add95cd4999aba74f37ce6987
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8666
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 Earth Sciences, University of Southern California, Los Angeles, CA, United States
Recommended Citation:
Tems C.E.,Berelson W.M.,Prokopenko M.G.. Particulate δ15N in laminated marine sediments as a proxy for mixing between the California Undercurrent and the California Current: A proof of concept[J]. Geophysical Research Letters,2015-01-01,42(2).