DOI: 10.1002/2015GL066317
论文题名: Enhanced subarctic Pacific stratification and nutrient utilization during glacials over the last 1.2 Myr
作者: Knudson K.P. ; Ravelo A.C.
刊名: Geophysical Research Letters
ISSN: 0094-8423
EISSN: 1944-8154
出版年: 2015
卷: 42, 期: 22 起始页码: 9870
结束页码: 9879
语种: 英语
英文关键词: Bering Sea
; glaciations
; HNLC
; iron fertilization
; nitrate
; stratification
Scopus关键词: Carbon
; Carbon dioxide
; Glacial geology
; Iron
; Nitrates
; Productivity
; Thermal stratification
; Bering sea
; Biological productivity
; Glacial-interglacial cycles
; Glaciations
; HNLC
; Iron fertilization
; Nutrient utilization
; Ocean stratification
; Nutrients
; air-sea interaction
; biological production
; carbon dioxide
; carbon flux
; chlorophyll
; eolian deposit
; glacial-interglacial cycle
; glaciation
; iron
; nitrate
; nitrogen isotope
; nutrient cycling
; nutrient use
; paleoceanography
; periodicity
; Pleistocene
; stratification
; Bering Sea
; Pacific Ocean
; Pacific Ocean (Subarctic)
英文摘要: The relationship between climate, biological productivity, and nutrient flux is of considerable interest in the subarctic Pacific, which represents an important high-nitrate, low-chlorophyll region. While previous studies suggest that changes in iron supply and/or physical ocean stratification could hypothetically explain orbital-scale fluctuations in subarctic Pacific nutrient utilization and productivity, previous records of nutrient utilization are too short to evaluate these relationships over many glacial-interglacial cycles. We present new, high-resolution records of sedimentary δ15N, which offer the first opportunity to evaluate systematic, orbital-scale variations in subarctic Pacific nitrate utilization from 1.2 Ma. Nitrate utilization was enhanced during all glacials, varied with orbital-scale periodicity since the mid-Pleistocene transition, was strongly correlated with enhanced aeolian dust and low atmospheric CO2, but was not correlated with productivity. These results suggest that glacial stratification, rather than iron fertilization, systematically exerted an important regional control on nutrient utilization and air-sea carbon flux. Key Points Subarctic Pacific nitrate utilization was enhanced during every previous glacial since 1.2 Ma Stratification controlled orbital-scale nitrate utilization and air-sea carbon flux Biological productivity in today's HNLC regions can switch from being iron to nitrate limited. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956951088&doi=10.1002%2f2015GL066317&partnerID=40&md5=b90837f96c9359c275b962ff600f8e6a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8039
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: Earth and Planetary Sciences Department, University of California, Santa Cruz, CA, United States
Recommended Citation:
Knudson K.P.,Ravelo A.C.. Enhanced subarctic Pacific stratification and nutrient utilization during glacials over the last 1.2 Myr[J]. Geophysical Research Letters,2015-01-01,42(22).