DOI: 10.1016/j.quascirev.2017.07.016
论文题名: A New Zealand perspective on centennial-scale Southern Hemisphere westerly wind shifts during the last two millennia
作者: Hinojosa J.L. ; Moy C.M. ; Stirling C.H. ; Wilson G.S. ; Eglinton T.I.
刊名: Quaternary Science Reviews
出版年: 2017
卷: 172 起始页码: 32
结束页码: 43
语种: 英语
英文关键词: Fiordland
; Fjord
; Late Holocene
; New Zealand
; Southern Hemisphere westerly winds
Scopus关键词: Carbon
; Fiordland
; Fjord
; Late Holocene
; New zealand
; Westerly winds
; Wind
英文摘要: The strength and latitudinal position of the Southern Hemisphere westerly winds control regional climate and influence the global carbon cycle by physically regulating Southern Ocean CO2 exchange with the atmosphere. However, the mechanisms driving interannual to millennial variability of the westerlies remain poorly understood. Here, we present an 1800-yr record of westerly wind variability recorded in New Zealand fjord sediments. Located west of the Southern Alps, fjord basins receive large amounts of westerly-driven orographic precipitation (>6 m yr−1) and strong winds lead to vigorous fjord mixing. Because of these links, reconstructing precipitation and fjord circulation provides information on westerly wind behavior over southwest New Zealand. Applying a multiproxy approach, we find several intervals of inferred regional wind variability. The intervals of 1450-1400, 825-775, 575-550, and 50-0 cal yr BP were anomalously wet, while 325-300 and 250-225 cal yr BP were anomalously dry. These interpreted intervals appear to be in phase with regional paleoclimate records. Two centennial-scale wet intervals align with a multi-centennial warm interval identified in the Pages2k Australasian temperature reconstruction, while the drier intervals generally occur during cooler times. The wet/dry intervals presented here are matched by opposite wind and/or precipitation trends reconstructed from the windfield core in Chile and the southern windfield margin in Antarctica. Such spatial patterns support the notion of centennial-scale latitudinal wind shifts or contraction/expansion of the core. Consistent with observations, all sites show wind strengthening from ∼50 cal yr BP to present, indicating an overall intensification of winds that is observed in modern instrumental and reanalysis data sets. © 2017 Elsevier Ltd 资助项目: Hinojosa, J.L.
; California Institute of Technology, Department of Geological and Planetary Sciences, 1200 E. California Blvd. MC 100-23, United States
; 电子邮件: hinojosa@gps.caltech.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59115
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand; Centre for Trace Element Analysis and Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand; Department of Marine Science, University of Otago, PO Box 56, Dunedin, New Zealand; Geological Institute, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland
Recommended Citation:
Hinojosa J.L.,Moy C.M.,Stirling C.H.,et al. A New Zealand perspective on centennial-scale Southern Hemisphere westerly wind shifts during the last two millennia[J]. Quaternary Science Reviews,2017-01-01,172