DOI: 10.1016/j.quascirev.2012.09.013
Scopus记录号: 2-s2.0-84880580468
论文题名: Evaluation of Lateglacial temperatures in the Southern Alps of New Zealand based on glacier modelling at Irishman Stream, Ben Ohau Range
作者: Doughty A.M. ; Anderson B.M. ; Mackintosh A.N. ; Kaplan M.R. ; Vandergoes M.J. ; Barrell D.J.A. ; Denton G.H. ; Schaefer J.M. ; Chinn T.J.H. ; Putnam A.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 74 起始页码: 160
结束页码: 169
语种: 英语
英文关键词: Antarctic cold reversal
; Glacier modelling
; Lateglacial
; New Zealand
; Palaeoclimate
; Southern Alps
Scopus关键词: Antarctic cold reversals
; Lateglacial
; New zealand
; Palaeoclimate
; Southern Alps
; Catchments
; Submarine geology
; Climate change
; altitude
; catchment
; deglaciation
; fly
; glacial environment
; late glacial
; latitudinal gradient
; moraine
; numerical model
; paleoclimate
; proxy climate record
; sea level change
; sediment core
; Southern Hemisphere
; stream
; temperature effect
; Alps
; Ben Ohau Range
; Canterbury [South Island]
; New Zealand
; South Island
; Chironomidae
英文摘要: Climate proxy records from the middle to high latitude Southern Hemisphere indicate that a Lateglacial (15,000-11,500yearsago) climate reversal, approximately coeval with the Antarctic Cold Reversal (ACR), interrupted a warming trend during deglaciation. In New Zealand, some palaeoclimate proxy records indicate a cool episode during the ACR (ca 14,500-12,500yearsago), while others do not express a significant change in climate. Recently published moraine maps and ages present an opportunity to improve the palaeoclimate interpretation through numerical modelling of glaciers. We use a coupled energy-balance and ice-flow model to quantify palaeoclimate from past glacier extent constrained by mapped and dated moraines in the headwaters of Irishman Stream, a high-elevation catchment in the Southern Alps. First, a suite of steady-state model runs is used to identify the temperature and precipitation forcing required to fit the modelled glacier to well-dated Lateglacial moraine crests. Second, time-dependent glacier simulations forced by a nearby proxy temperature record derived from chironomids are used to assess the fit with the glacial geomorphic record. Steady-state experiments using an optimal parameter set demonstrate that the conditions under which the 13,000yearold moraine formed were 2.3-3.2°C colder than present with the range in temperature corresponding to a ±20% variance in precipitation relative to the present-day. This reconstructed climate change relative to the present-day corresponds to an equilibrium-line altitude of ca 2000±40m above sea level (asl), which is ca 400m lower than present. Time-dependent simulations of glacier length produce ice advance to within 100m of the 13,000year old terminal moraine, indicating that the chironomid-based temperature forcing and moraine record provide consistent information about past climate. Our results, together with other climate proxy reconstructions from pollen records and marine sediment cores, support the notion that temperatures during the ACR in New Zealand were ~2-3°C cooler than today. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60569
Appears in Collections: 过去全球变化的重建
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作者单位: Antarctic Research Centre, Victoria University of Wellington, Po Box 600, Wellington 6140, New Zealand; School of Geography Environment and Earth Sciences, Victoria University of Wellington, Po Box 600, Wellington 6140, New Zealand; Lamont-Doherty Earth Observatory, Palisades, NY 10964, United States; GNS Science, 1 Fairway Drive, Avalon 5010, Po Box 30-368, Lower Hutt 5040, New Zealand; GNS Science, 764 Cumberland Street, Dunedin 9016, New Zealand; Department of Earth Sciences, Climate Change Institute, University of Maine, Orono, ME 04469, United States; 20 Muir Road, Lake Hawea, RD2 Wanaka 9382, New Zealand
Recommended Citation:
Doughty A.M.,Anderson B.M.,Mackintosh A.N.,et al. Evaluation of Lateglacial temperatures in the Southern Alps of New Zealand based on glacier modelling at Irishman Stream, Ben Ohau Range[J]. Quaternary Science Reviews,2013-01-01,74