2 results for Almond, PC

  • Quaternary geomorphology, stratigraphy, and paleoclimate of the central Southern Alps, South Island

    Almond, PC; Barrell, D; Hyatt, O; Rother, H; Shulmeister, J; Vandergoes, M

    Lincoln University

    On our first day we leave Christchurch and travel inland to the eastern front range of the Southern Alps, venturing into the Rakaia valley. Here we will see spectacular examples of glacial landforms, glacial sedimentology, and post glacial valley modification. After leaving the Rakaia Valley we follow the foot of ranges southwards to the McKenzie Basin, a tectonic depression adjacent to the highest peaks in the Southern Alps. Twizel is our stop for the night. Day 2, we backtrack slightly and head up the southern flank of Lake Pukaki, one of the large finger lakes described above, to Mt Cook village, seeing glacial features ranging from Last Glacial Maximum to latest Holocene in age, as well as present-day glaciers. From Mt Cook village we retrace our steps to Twizel and continue south to the driest and most continental region of New Zealand, Central Otago. We stay on the shores of Lake Wanaka for the night of Day 2. Day 3 takes us from the dry climates of Central Otago to the wet, forest cloaked landscape of the West Coast via the Haast Pass over the Southern Alps. This day involves soils, Holocene coastal geomorphology, marine terraces and late glacial moraines. The day ends in the township of Franz Josef. Day 4 starts with a plane flight for those with the inclination or a trip up to see the Franz Josef glacier. Afterwards we travel to Okarito Bog, the site of a splendid pollen record spanning the complete last glacial cycle, then head north to Hokitika. On the way we stop to discuss last glacial maximum moraines in the Poerua valley, and the effects of a recent large landslide on the landscape and people of the valley. The area around Hokitika is the focus of the next day when we review the classic glacial geomorphology of the Hokitika-Taramakau systems. The final part of the day takes us to Punakaiki on the western flanks of the Paparoa Range. On day 6 we continue north, stopping briefly near Westport to discuss a well studied peat section on a marine terrace of Cape Foulwind, then head through the Buller Gorge to the Inangahua Valley. We then turn south again to re-cross the Southern Alps over the Lewis Pass. Our final stop of the tour before Christchurch is in the Hope Valley.

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  • Towards a climate event stratigraphy for New Zealand over the past 30 000 years (NZ-INTIMATE project)

    Alloway, Brent; Lowe, DJ; Barrell, DJ; Newnham, RM; Almond, PC; Augustinus, Paul; Bertler, NA; Carter, L; Litchfield, NJ; McGlone, MS; Shulmeister, J; Vandergoes, MJ; Williams, PW (2007)

    Journal article
    The University of Auckland Library

    It is widely recognised that the acquisition of high-resolution palaeoclimate records from southern mid-latitude sites is essential for establishing a coherent picture of inter-hemispheric climate change and for better understanding of the role of Antarctic climate dynamics in the global climate system. New Zealand is considered to be a sensitive monitor of climate change because it is one of a few sizeable landmasses in the Southern Hemisphere westerly circulation zone, a critical transition zone between subtropical and Antarctic in???uences. New Zealand has mountainous axial ranges that amplify the climate signals and, consequently, the environmental gradients are highly sensitive to subtle changes in atmospheric and oceanic conditions. Since 1995, INTIMATE has, through a series of international workshops, sought ways to improve procedures for establishing the precise ages of climate events, and to correlate them with high precision, for the last 30 000 calendar years. The NZ-INTIMATE project commenced in late 2003, and has involved virtually the entire New Zealand palaeoclimate community. Its aim is to develop an event stratigraphy for the New Zealand region over the past 30 000 years, and to reconcile these events against the established climatostratigraphy of the last glacial cycle which has largely been developed from Northern Hemisphere records (e.g. Last Glacial Maximum (LGM), Termination I, Younger Dryas). An initial outcome of NZ-INTIMATE has been the identi???cation of a series of well-dated, high-resolution onshore and offshore proxy records from a variety of latitudes and elevations on a common calendar timescale from 30 000 cal. yr BP to the present day. High-resolution records for the last glacial coldest period (LGCP) (including the LGM sensu stricto) and last glacial???interglacial transition (LGIT) from Auckland maars, Kaipo and Otamangakau wetlands on eastern and central North Island, marine core MD97-2121 east of southern North Island, speleothems on northwest South Island, Okarito wetland on southwestern South Island, are presented. Discontinuous (fragmentary) records comprising compilations of glacial sequences, ???uvial sequences, loess accumulation, and aeolian quartz accumulation in an andesitic terrain are described. Comparisons with ice-core records from Antarctica (EPICA Dome C) and Greenland (GISP2) are discussed. A major advantage immediately evident from these records apart from the speleothem record, is that they are linked precisely by one or more tephra layers. Based on these New Zealand terrestrial and marine records, a reasonably coherent, regionally applicable, sequence of climatically linked stratigraphic events over the past 30 000 cal. yr is emerging. Three major climate events are recognised: (1) LGCP beginning at ca. 28 000 cal. yr BP, ending at Termination I, ca. 18 000 cal. yr BP, and including a warmer and more variable phase between ca. 27 000 and 21 000 cal. yr BP, (2) LGIT between ca. 18 000 and 11 600 cal. yr BP, including a Lateglacial warm period from ca. 14 800 to 13 500 cal. yr BP and a Lateglacial climate reversal between ca. 13 500 and 11 600 cal. yr BP, and (3) Holocene interglacial conditions, with two phases of greatest warmth between ca. 11 600 and 10 800 cal. yr BP and from ca. 6 800 to 6 500 cal. yr BP. Some key boundaries coincide with volcanic tephras.

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