Dendroglaciological evidence for Holocene glacial advances in the Todd Icefield area, northern British Columbia Coast Mountains

Jackson, Scott I.; Laxton, Sarah C.; Smith, Dan J.

doi:10.1139/e07-071

Cited by 29 publications

(52 citation statements)

References 49 publications

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“…AD (Reyes et al, 2006;Allen and Smith, 2007). Some of these FMA expansions were of similar extent to the later LIA advances and stratigraphically superposed forest horizons at Surprise Glacier in British Columbia suggest that the FMA may have included two distinct phases of advance (Jackson et al, 2008). Although the precision issues of radiocarbon ages limit the degree to which such records can be compared with absolute tree-ring-dated records (Baillie, 1991), the AD 710s to 720s advance of Tebenkof Glacier appears to correspond generally with the later part of the FMA interval.…”

Section: Discussionmentioning

confidence: 81%

Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern Alaska

2009

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Tree-ring crossdates from glacially killed logs show that Tebenkof Glacier advanced into a forefield forest in the AD 710s and 720s. Recession from this First Millennium AD (FMA) advance occurred before the 950s, after which the ice margin readvanced in the 1280s to 1320s at the start of the Little Ice Age (LIA). A more extensive LIA advance was underway from the 1640s to 1670s, and the terminus stayed at or near its LIA maximum until the 1890s. These are the first absolute tree-ring crossdates for a FMA glacier advance in North America and support growing evidence from northwestern North America and Europe for a significant cool interval in the centuries around AD 500.

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Section: Discussionmentioning

confidence: 81%

Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern Alaska

2009

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“…Field studies throughout the region have led to the discovery of recently exposed remains of glacially killed trees and detrital wood deposits (Allen and Jackson et al, 2008;Koch et al, 2009;Koehler and Smith, 2011;Osborn et al, 2007); findings that provide evidence of repeated intervals of ice front advance and retreat over the past 10,000 years .…”

Section: Introductionmentioning

confidence: 99%

Dendroglaciological investigations of mid- to late-Holocene glacial activity in the Mt. Waddington area, British Columbia Coast Mountains, Canada

2012

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Dendroglaciological investigations near Mt. Waddington in the central British Columbia Coast Mountains provide an enhanced perspective of Holocene glacial activity. Field investigations at Confederation, Franklin, and Jambeau glaciers led to the discovery of subfossil wood mats encased in glacial deposits and glacially sheared stumps buried beneath till. Radiocarbon-dated wood collected from valley-bottom and lateral moraine sites at Confederation Glacier suggest that an early-Holocene advance occurred at c. 5665 cal. yr BP, followed by succeeding intervals of glacier expansion at c. 3700 and 3500 cal. yr BP. At Jambeau Glacier detrital wood mats buried close to the contemporary lateral moraine crests document glacier expansion at c. 3000 cal. yr BP. Detrital subfossil wood buried in lateral moraines at the confluence of Confederation and Franklin glaciers records distinct episodes of 'Little Ice Age' glacier expansion as early as c. 1212 cal. yr ad, and suggests the glacier surface continued to thicken until at least c. 1330-1410 cal. yr ad. An interval of downwasting and retreat followed, before late 'Little Ice Age' advances such as those at Jambeau Glacier were overwhelming valley-bottom forests by c. 1740 cal. yr ad. With the exception of the previously unrecognized advance of Confederation Glacier at c. 3700 cal. yr BP, our dendroglaciological findings corroborate the emerging record of Holocene glacier activity in the British Columbia Coast Mountains.

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“…Most prior dendroglaciological reconstructions in the Coast Mountains have relied on dating trees directly damaged or killed by glaciers (Smith and Laroque, 1996;Allen and Smith, 2007;Jackson et al, 2008). This approach, however, provides an incomplete record of past glacier activity because glacial advances of the past several hundred years destroyed or buried much of the evidence of earlier events (e.g.…”

Section: Introductionmentioning

confidence: 99%

Dendrogeomorphic reconstruction of Little Ice Age paraglacial activity in the vicinity of the Homathko Icefield, British Columbia Coast Mountains, Canada

2010

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Dendroglaciological evidence for Holocene glacial advances in the Todd Icefield area, northern British Columbia Coast Mountains

Abstract: Accelerated glacial recession and downwasting in Pacific North America is exposing land surfaces and features buried by glacial advances that, in many locations, predate the recent Little

Cited by 29 publications

References 49 publications

Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern Alaska

Tree-ring crossdates for a First Millennium AD advance of Tebenkof Glacier, southern Alaska

Dendroglaciological investigations of mid- to late-Holocene glacial activity in the Mt. Waddington area, British Columbia Coast Mountains, Canada

Dendrogeomorphic reconstruction of Little Ice Age paraglacial activity in the vicinity of the Homathko Icefield, British Columbia Coast Mountains, Canada

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