Onset of Neoglaciation in the Southern Hemisphere

Porter, Stephen C.

doi:10.1002/1099-1417(200005)15:4<395::aid-jqs535>3.0.co;2-h

Cited by 124 publications

(89 citation statements)

References 44 publications

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“…A glacier advance prior to 5050 14 C yr BP concluded on basis of one radiocarbon date [13] cannot be supported by the present study. Another advance that should have taken place after 2230 14 C y BP, this may correspond to the age of the moraine ridge group 1 (LM 'a'/'b'/'c'). The advance reported around 1550 14 C y BP [13] correlates to moraine ridge group 2 (LM 'd'/'e'), but the relationship of the 14 C dates to glacier activity requires further testing.…”

Section: Holocene Glacier Chronologycontrasting

confidence: 78%

“…As no comparable lateral moraine system exists in the outer parts of the foreland, and the younger 'Little Ice Age'-moraines are located in dense subalpine forest, this moraine complex comprises the study area. The multi-ridged morphol-ogy is assumed as having great potential for investigating both the number and timing of presumed pre-'Little Ice Age' Neoglacial events in this region [12][13][14]19]. All of the ridges are located above the local tree line and covered by alpine grass vegetation with very few (small and young) specimen of Acipylla spec.…”

Section: Study Areamentioning

confidence: 99%

“…Such palaeosol radiocarbon dates show large differences between individual measured ages (up to 3 kyr) for separate organic fractions and are, therefore, unreliable. A glacier advance prior to 5050 14 C yr BP concluded on basis of one radiocarbon date [13] cannot be supported by the present study. Another advance that should have taken place after 2230 14 C y BP, this may correspond to the age of the moraine ridge group 1 (LM 'a'/'b'/'c').…”

Section: Holocene Glacier Chronologymentioning

confidence: 99%

“…[6][7][8][9][10][11], the late-Holocene glacier history has only received limited attention e.g. [12][13][14][15][16][17]. In addition, previous research [18,19] revealed the need for revision due to methodological uncertainties, such as, the focus on the Tasman Glacier as a problematical key locality cf.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

First attempt to combine terrestrial cosmogenic nuclide (10Be) and Schmidt hammer relative-age dating: Strauchon Glacier, Southern Alps, New Zealand

Winkler

2009

Open Geosciences

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This study provides the first attempt to combine terrestrial (in situ) cosmogenic nuclide (10Be) surface exposure dating with Schmidt hammer relative-age dating for the age estimation of Holocene moraines at Strauchon Glacier, Southern Alps, New Zealand. Numerous Schmidt hammer tests enable a multi-ridged lateral moraine system to be related to three late-Holocene ‘Little Ice Age’-type events. On the basis of cosmogenic 10Be ages, those events are dated to c. 2400, 1700, and 1100 years ago. Linear age-calibration curves are constructed in order to relate Schmidt hammer R-values to cosmogenic 10Be ages. The high explanation yielded reveals the causal link between both data sets. The potential of combining both methods in a ‘’multiproxy approach’ is discussed alongside possible future improvements. Terrestrial cosmogenic nuclide dating delivers absolute ages needed as fixed points for Schmidt hammer age-calibration curves. The Schmidt hammer technique can be used to crosscheck the boulder surfaces chosen for surface exposure dating by terrestrial cosmogenic nuclides. It should, therefore, reduce the number of samples necessary and costs.

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Section: Holocene Glacier Chronologycontrasting

confidence: 78%

Section: Study Areamentioning

confidence: 99%

Section: Holocene Glacier Chronologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

First attempt to combine terrestrial cosmogenic nuclide (10Be) and Schmidt hammer relative-age dating: Strauchon Glacier, Southern Alps, New Zealand

Winkler

2009

Open Geosciences

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“…9. Glacier advances (25)(26)(27), oxygen isotope ratios from Taylor Dome (28), precipitation off shore in Chile at 41°S (29), and ENSO (30). These independent paleoclimate records are compared with regional trends in forest taxa percentages and CHAR, which have been estimated with GAMs and converted to the appropriate units (i.e., pollen percentages and charcoal particles cm 2 ·y −1 ; this study).…”

Section: Methodsmentioning

confidence: 98%

Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Iglesias

Whitlock

2014

Proc. Natl. Acad. Sci. U.S.A.

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Forest/steppe boundaries are among the most dynamic ecosystems on Earth and are highly vulnerable to changes in climate and land use. In this study we examine the postglacial history of the Patagonian forest/steppe ecotone (41-43°S) to better understand its sensitivity to past variations in climate, disturbance, and human activity before European colonization. We present regional trends in vegetation and biomass burning, as detected by generalized additive models fitted to seven pollen and charcoal records, and compare the results with other paleoenvironmental data, as well as archeological and ecological information to (i) estimate postglacial fire trends at regional scales, (ii) assess the evolution of climate-vegetation-fire linkages over the last 18,000 calibrated (cal) years B.P., and (iii) evaluate the role of humans in altering pre-European landscapes and fire regimes. Pollen and charcoal data indicate that biomass burning was relatively low during warm/dry steppe-dominated landscapes in the late glacial/Early Holocene transition and increased as more humid conditions favored forest development after ca. 10,000 cal years B.P. Postglacial fire activity was thus limited by fuel availability associated with sparse vegetation cover rather than by suitable climate conditions. In contrast to extensive burning by European settlers, variations in indigenous population densities were not associated with fluctuations in regional or watershed-scale fire occurrence, suggesting that climate-vegetation-fire linkages in northern Patagonia evolved with minimal or very localized human influences before European settlement.charcoal | fire | climate | anthropogenic impact | Patagonia

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Revised palaeoclimatic significance of Mueller Glacier moraines, Southern Alps, New Zealand

Reznichenko

Davies

Winkler

2015

Earth Surf Processes Landf

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A sequence of Late Holocene moraines on the foreland of the Mueller Glacier, Southern Alps, New Zealand, forms part of a local moraine‐age database used to establish a regional glacier chronology and subsequently to investigate potential intra‐hemispheric and global climate forcing mechanisms. We present new sedimentological and geomorphological evidence that a set of these moraine ridges, previously considered to represent individual advances, constitutes a single moraine complex (the ‘Mueller Memorial Moraine’) formed by supraglacial transport of a large volume of landslide debris to the glacier terminus. Because a moraine formed in this way is not necessarily associated with an advance triggered by a climate event, we question the palaeoclimatic significance of the Mueller Memorial Moraine, as well as that of other moraines in comparable settings. Our findings suggest that the mode of formation and glacio‐dynamical context of moraines whose ages contribute to existing palaeoclimate reconstructions need to be re‐examined in order to assess the reliability of these reconstructions. Copyright © 2015 John Wiley & Sons, Ltd.

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Onset of Neoglaciation in the Southern Hemisphere

Cited by 124 publications

References 44 publications

First attempt to combine terrestrial cosmogenic nuclide (10Be) and Schmidt hammer relative-age dating: Strauchon Glacier, Southern Alps, New Zealand

First attempt to combine terrestrial cosmogenic nuclide (10Be) and Schmidt hammer relative-age dating: Strauchon Glacier, Southern Alps, New Zealand

Fire responses to postglacial climate change and human impact in northern Patagonia (41–43°S)

Revised palaeoclimatic significance of Mueller Glacier moraines, Southern Alps, New Zealand

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