Piston Corers for Peat and Lake Sediments

Wright, H. E.; Mann, Daniel H.; Glaser, Paul H.

doi:10.2307/1941430

Cited by 429 publications

(228 citation statements)

References 2 publications

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“…In the absence of a local name for the lake, it is here termed Lake Chonita. The core studied (PATAM1 B07; 4.67 m long) was obtained in the deepest part of the lake (3.13 m water depth), using a modified Livingstone squared-rod piston core (Wright et al, 1984). The present study is focused on the detailed analysis and palaeoecological interpretation of the Late Glacial to early Holocene interval, ranging from 2.97 to 4.67 m. Nine samples were taken along the whole core for radiocarbon dating, four of them falling within the interval discussed here.…”

Section: Methodsmentioning

confidence: 99%

Vegetation changes in the Neotropical Gran Sabana (Venezuela) around the Younger Dryas chron

Montoya

Rull

Stansell

et al. 2011

J Quaternary Science

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The occurrence of the Younger Dryas cold reversal in northern South America midlands and lowlands remains controversial. We present a palaeoecological analysis of a Late Glacial lacustrine section from a midland lake (Lake Chonita, 4.6501 8N, 61.0157 8W, 884 m elevation) located in the Venezuelan Gran Sabana, based on physical and biological proxies. The sediments were mostly barren from $15.3 to 12.7 k cal a BP, probably due to poor preservation. A ligneous community with no clear modern analogues was dominant from 12.7 to 11.7 k cal a BP (Younger Dryas chronozone). At present, similar shrublands are situated around 200 m elevation above the lake, suggesting a cooling-driven downward shift in vegetation during that period. The interval from 11.7 to 10.6 k cal a BP is marked by a dramatic replacement of the shrubland by savannas and a conspicuous increase in fire incidence. The intensification of local and regional fires at this interval could have played a role in the vegetation shift. A change to wetter, and probably warmer, conditions is deduced after 11.7 k cal a BP, coinciding with the early Holocene warming. These results support the hypothesis of a mixed origin (climate and fire) of the Gran Sabana savannas, and highlight the climatic instability of the Neotropics during the Late Glacial.

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Section: Methodsmentioning

confidence: 99%

Vegetation changes in the Neotropical Gran Sabana (Venezuela) around the Younger Dryas chron

Montoya

Rull

Stansell

et al. 2011

J Quaternary Science

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“…In 1999, we recovered sediment cores from L. Mucubají and L. Blanca with percussion and square-rod coring systems (46). Duplicate cores and undisturbed sediment͞ water interface cores were retrieved from L. Mucubají, and the interface core was extruded at 0.5-cm intervals in the field.…”

Section: Methodsmentioning

confidence: 99%

Solar modulation of Little Ice Age climate in the tropical Andes

Polissar

Abbott

Wolfe

et al. 2006

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

105

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The underlying causes of late-Holocene climate variability in the tropics are incompletely understood. Here we report a 1,500-year reconstruction of climate history and glaciation in the Venezuelan Andes using lake sediments. Four glacial advances occurred between anno Domini (A.D.) 1250 and 1810, coincident with solaractivity minima. Temperature declines of ؊3.2 ؎ 1.4°C and precipitation increases of Ϸ20% are required to produce the observed glacial responses. These results highlight the sensitivity of highaltitude tropical regions to relatively small changes in radiative forcing, implying even greater probable responses to future anthropogenic forcing.climate forcing ͉ glacier reconstruction ͉ moisture balance ͉ Venezuela

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“…A 352 cm sediment core was retrieved in October 2002 with a modified Livingstone piston corer (internal barrel diameter 5 cm) from the southern basin of Tiny Lake (Wright et al, 1984), where the occurrence of a conformable sedimentary sequence was inferred from seismic profiling (Fig. 3).…”

Section: Core Collectionmentioning

confidence: 99%

Postglacial vegetation and climate dynamics in the Seymour‐Belize Inlet Complex, central coastal British Columbia, Canada: palynological evidence from Tiny Lake

Galloway

Doherty

Patterson

et al. 2009

J Quaternary Science

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A pollen-based study from Tiny Lake in the Seymour-Belize Inlet Complex of central coastal British Columbia, Canada, permits an evaluation of the dynamic response of coastal temperate rainforests to postglacial climate change. Open Pinus parklands grew at the site during the early Lateglacial when the climate was cool and dry, but more humid conditions in the later phases of the Lateglacial permitted mesophytic conifers to colonise the region. Early Holocene conditions were warmer than present and a successional mosaic of Tsuga heterophylla and Alnus occurred at Tiny Lake. Climate cooling and moistening at 8740 AE 70 14 C a BP initiated the development of closed, late successional T. heterophylla-Cupressaceae forests, which achieved modern character after 6860 AE 50 14 C a BP, when a temperate and very wet climate became established. The onset of early Holocene climate cooling and moistening at Tiny Lake may have preceded change at more southern locations, including within the Seymour-Belize Inlet Complex, on a meso-to synoptic scale. This would suggest that an early Holocene intensification of the Aleutian Low pressure system was an important influence on forest dynamics in the Seymour-Belize Inlet Complex and that the study region was located near the southern extent of immediate influence of this semi-permanent air mass.

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Piston Corers for Peat and Lake Sediments

Cited by 429 publications

References 2 publications

Vegetation changes in the Neotropical Gran Sabana (Venezuela) around the Younger Dryas chron

Vegetation changes in the Neotropical Gran Sabana (Venezuela) around the Younger Dryas chron

Solar modulation of Little Ice Age climate in the tropical Andes

Postglacial vegetation and climate dynamics in the Seymour‐Belize Inlet Complex, central coastal British Columbia, Canada: palynological evidence from Tiny Lake

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