DOI: 10.1002/2016GB005579
Scopus记录号: 2-s2.0-85019939693
论文题名: Productivity patterns in the equatorial Pacific over the last 30,000 years
作者: Costa K ; M ; , Jacobel A ; W ; , McManus J ; F ; , Anderson R ; F ; , Winckler G ; , Thiagarajan N
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 5 起始页码: 850
结束页码: 865
语种: 英语
英文关键词: deglaciation
; equatorial Pacific
; productivity
Scopus关键词: climate change
; El Nino-Southern Oscillation
; entrainment
; Holocene
; intertropical convergence zone
; last deglaciation
; Last Glacial
; nutrient availability
; precession
; primary production
; reconstruction
; spatiotemporal analysis
; Line Islands
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Peru
英文摘要: The equatorial Pacific traverses a number of productivity regimes, from the highly productive coastal upwelling along Peru to the near gyre-like productivity lows along the international dateline, making it an ideal target for investigating how biogeochemical systems respond to changing oceanographic conditions over time. However, conflicting reconstructions of productivity during periods of rapid climate change, like the last deglaciation, render the spatiotemporal response of equatorial Pacific productivity ambiguous. In this study, surface productivity since the last glacial period (30,000 years ago) is reconstructed from seven cores near the Line Islands, central equatorial Pacific, and integrated with productivity records from across the equatorial Pacific. Three coherent deglacial patterns in productivity are identified: (1) a monotonic glacial-Holocene increase in productivity, primarily along the Equator, associated with increasing nutrient concentrations over time; (2) a deglacial peak in productivity ~15,000 years ago due to transient entrainment of nutrient rich southern-sourced deep waters; and (3) possible precessional cycles in productivity in the eastern equatorial Pacific that may be related to Intertropical Convergence Zone migration and potential interactions with El Niño–Southern Oscillation dynamics. These findings suggest that productivity was generally lower during the glacial period, a trend observed zonally across the equatorial Pacific, while deglacial peaks in productivity may be prominent only in the east. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77737
Appears in Collections: 气候变化事实与影响
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作者单位: Geochemistry Division, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Costa K,M,, Jacobel A,et al. Productivity patterns in the equatorial Pacific over the last 30,000 years[J]. Global Biogeochemical Cycles,2017-01-01,31(5)