Evidence for a variable and wet Younger Dryas in southern Alaska

Darrell S Kaufman, Scott R Anderson, Feng Sheng Hu, Edward Berg, Al Werner

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Pollen, macro- and micro-fossils, and sedimentologic indicators in sediment cores from Discovery Pond (DP) in south-central Alaska indicate that the coldest interval of the last deglacation was coincident with the onset of the Younger Dryas (YD), around 12.8. cal. ka. The multi-proxy record from DP together with a compilation of recently published YD records from southern Alaska and the adjacent northern Pacific Ocean shows that, during the course of the YD, temperatures increased, then reached a maximum sometime around 11. cal. ka. At DP, a pronounced increase in the abundance of Isoëtes and Pediastrum, including species associated with oligotrophic lakes and known to respond to increased precipitation, combined with a reduction in wetland aquatics and an increase in the minerogenic component of the sediment, all indicate a shift from wetland to open-water conditions at around 12.2. cal. ka. Similar to other evidence from southern Alaska, our proxy record from DP indicates an increase in temperature and effective moisture during the second half of the YD. An increase in winter precipitation might be associated with a deepening of the Aleutian low-pressure system and a northward shift in winter storm tracks, consistent with recent simulations by climate system models.

Original languageEnglish (US)
Pages (from-to)1445-1452
Number of pages8
JournalQuaternary Science Reviews
Volume29
Issue number11-12
DOIs
StatePublished - Jun 2010

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Younger Dryas
wetland
pond
system model
evidence
wetlands
fossils
Pediastrum
climate
fossil
low pressure system
water
sediments
simulation
storm track
winter
open water
Pacific Ocean
sediment core
temperature

ASJC Scopus subject areas

  • Geology
  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics

Cite this

Evidence for a variable and wet Younger Dryas in southern Alaska. / Kaufman, Darrell S; Anderson, Scott R; Hu, Feng Sheng; Berg, Edward; Werner, Al.

In: Quaternary Science Reviews, Vol. 29, No. 11-12, 06.2010, p. 1445-1452.

Research output: Contribution to journalArticle

Kaufman, Darrell S ; Anderson, Scott R ; Hu, Feng Sheng ; Berg, Edward ; Werner, Al. / Evidence for a variable and wet Younger Dryas in southern Alaska. In: Quaternary Science Reviews. 2010 ; Vol. 29, No. 11-12. pp. 1445-1452.
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