DOI: 10.1007/s00382-013-1876-8
Scopus记录号: 2-s2.0-84901985876
论文题名: The Little Ice Age climate of New Zealand reconstructed from Southern Alps cirque glaciers: A synoptic type approach
作者: Lorrey A. ; Fauchereau N. ; Stanton C. ; Chappell P. ; Phipps S. ; Mackintosh A. ; Renwick J. ; Goodwin I. ; Fowler A.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-11-12 起始页码: 3039
结束页码: 3060
语种: 英语
英文关键词: Equilibrium line altitude
; Glaciers
; Little Ice Age
; New Zealand
; Palaeoclimate
; Southern Hemisphere
; Synoptic types
英文摘要: Little Ice Age (LIA) austral summer temperature anomalies were derived from palaeoequilibrium line altitudes at 22 cirque glacier sites across the Southern Alps of New Zealand. Modern analog seasons with temperature anomalies akin to the LIA reconstructions were selected, and then applied in a sampling of high-resolution gridded New Zealand climate data and global reanalysis data to generate LIA climate composites at local, regional and hemispheric scales. The composite anomaly patterns assist in improving our understanding of atmospheric circulation contributions to the LIA climate state, allow an interrogation of synoptic type frequency changes for the LIA relative to present, and provide a hemispheric context of the past conditions in New Zealand. An LIA summer temperature anomaly of -0.56 °C (±0.29 °C) for the Southern Alps based on palaeo-equilibrium lines compares well with local tree-ring reconstructions of austral summer temperature. Reconstructed geopotential height at 1,000 hPa (z1000) suggests enhanced southwesterly flow across New Zealand occurred during the LIA to generate the terrestrial temperature anomalies. The mean atmospheric circulation pattern for summer resulted from a crucial reduction of the 'HSE'-blocking synoptic type (highs over and to the west of NZ; largely settled conditions) and increases in both the 'T'- and 'SW'-trough synoptic types (lows passing over NZ; enhanced southerly and southwesterly flow) relative to normal. Associated land-based temperature and precipitation anomalies suggest both colder- and wetter-than-normal conditions were a pervasive component of the base climate state across New Zealand during the LIA, as were colder-than-normal Tasman Sea surface temperatures. Proxy temperature and circulation evidence were used to corroborate the spatially heterogeneous Southern Hemisphere composite z1000 and sea surface temperature patterns generated in this study. A comparison of the composites to climate mode archetypes suggests LIA summer climate and atmospheric circulation over New Zealand was driven by increased frequency of weak El Niño-Modoki in the tropical Pacific and negative Southern Annular Mode activity. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54452
Appears in Collections: 过去全球变化的重建
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作者单位: National Institute of Water and Atmospheric Research Ltd., Auckland, New Zealand; CSIRO Wealth from Oceans Flagship, ARC Centre of Excellence for Climate System Science, Climate Change Research Centre, University of New South Wales, Sydney, Australia; Victoria University Wellington, Antarctic Research Centre, Wellington, New Zealand; Victoria University Wellington, School of Geography, Earth Sciences, Wellington, New Zealand; Marine Climate Risk Group, Climate Futures and Department of Environment and Geography, Macquarie University, Sydney, Australia; University of Auckland, School of Environment, Auckland, New Zealand
Recommended Citation:
Lorrey A.,Fauchereau N.,Stanton C.,et al. The Little Ice Age climate of New Zealand reconstructed from Southern Alps cirque glaciers: A synoptic type approach[J]. Climate Dynamics,2014-01-01,42(2017-11-12)