Reconstruction of climate and ecology of Skagit Valley, Washington, from 27.7 to 19.8 ka based on plant and beetle macrofossils.
Glacial lake sediments exposed at two sites in Skagit Valley, Washington, encase abundant macrofossils dating from 27.7 to 19.8 cal ka BP. At the last glacial maximum (LGM) most of the valley floor was part of a regionally extensive arid boreal (subalpine) forest that periodically included montane a...
| Publicado en: | Quaternary Research Vol. 106; pp. 94 - 113 |
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| Autores principales: | , , , |
| Formato: | Artículo |
| Publicado: |
Cambridge University Press
Mar2022
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=190284425&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 190284425 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00335894 2AW jtl: Quaternary Research issn: 00335894 maglogo: N pubinfo: dt: Mar2022 vid: 106 pid: 15979 pub: Cambridge University Press artinfo: ui: 190284425 10.1017/qua.2021.50 ppf: 94 ppct: 19 formats: tig: atl: Reconstruction of climate and ecology of Skagit Valley, Washington, from 27.7 to 19.8 ka based on plant and beetle macrofossils. aug: au: Riedel, Jon L. Telka, Alice Bunn, Andy Clague, John J. affil: Retired, National Park Service, 7280 Ranger Station Road, Marblemount, WA 98267, USA. Paleotec Services, 1-574 Somerset Street, Ottawa, ON K1R 5K2, Canada. Huxley College of the Environment, Western Washington University, 516 High St, Bellingham, WA 98225, USA. Department of Earth Sciences, Simon Fraser University, 8888 University Dr, Burnaby, BC V5A 1S6, Canada. sug: keyword: Last glaciation Macrofossils North Cascades Paleoclimate Paleoecology Skagit Valley Washington ab: Glacial lake sediments exposed at two sites in Skagit Valley, Washington, encase abundant macrofossils dating from 27.7 to 19.8 cal ka BP. At the last glacial maximum (LGM) most of the valley floor was part of a regionally extensive arid boreal (subalpine) forest that periodically included montane and temperate trees and open boreal species such as dwarf birch, northern spikemoss, and heath. We used the modern distribution and climate of 14 species in 12 macrofossil assemblages and a probability density function approach to reconstruct the LGM climate. Median annual precipitation (MAP) at glacial Lake Concrete (GLC) was ~50% lower than today. In comparison, MAP at glacial Lake Skymo (GLS) was only ~10% lower, which eliminated the steep climate gradient observed today. Median January air temperature at GLC was up to 10.8°C lower than today at 23.5 cal ka BP and 8.7°C lower at GLS at 25.1 cal ka BP. Median July air temperature declines were smaller at GLC (3.4°C–5.0°C) and GLS (4.2°C–6.3°C). Warmer winters (+2°C to +4°C) and increases in MAP (+200 mm) occurred at 27.7, 25.9, 24.4, and 21.2–20.7 cal ka BP. These changes accord with other regional proxies and Dansgaard–Oeschger interstades in the North Atlantic. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2022 holdings: @attributes: islocal: N |
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