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Early Younger Dryas glacier culmination in southern Alaska; implications for North Atlantic climate change during the last deglaciation

Nicolas E. Young, Jason P. Briner, Joerg Schaefer, Susan Zimmerman and Robert C. Finkel
Early Younger Dryas glacier culmination in southern Alaska; implications for North Atlantic climate change during the last deglaciation
Geology (Boulder) (April 2019) Pre-Issue Publication

Abstract

The transition from the glacial period to the Holocene was characterized by a dramatic reorganization of Earth's climate system linked to abrupt changes in atmospheric and oceanic circulation. In particular, considerable effort has been placed on constraining the magnitude, timing, and spatial variability of climatic changes during the Younger Dryas stadial (YD; 12.9-11.7 ka) within the North Atlantic region. Whereas the YD is clearly expressed in some climate archives, the record of mountain glacier change through the YD remains enigmatic and has elicited debate concerning the overall magnitude and seasonality associated with YD temperature change. Here, we report 19 new (super 10) Be ages from a location in the Pacific sector-the Ahklun Mountains, southern Alaska-that constrain the age of a late-glacial terminal moraine to 12.52 + or - 0.24 ka, in the middle of the YD stadial. Our new (super 10) Be ages, combined with additional Northern Hemisphere records of glacier change, reveal that glacier culminations occurred in the early and/or middle YD, followed by glacier recession through the remainder of the YD. Widespread early-to-middle Younger Dryas glacier culminations imply modest summer cooling (i.e., seasonality) that briefly punctuated an overall warming trend through the YD stadial. This pattern of glacier culminations occurring in the early-to-middle YD followed by retreat through the remainder of the YD largely mimics the pattern of YD temperature change displayed in Greenland ice cores.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: Pre-Issue Publication
Title: Early Younger Dryas glacier culmination in southern Alaska; implications for North Atlantic climate change during the last deglaciation
Affiliation: Lamont-Doherty Earth Observatory, Palisades, NY, United States
Published: 20190416
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 38
Accession Number: 2019-038014
Categories: Quaternary geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N59°46'00" - N59°46'00", W159°13'00" - W159°13'00"
Secondary Affiliation: University at Buffalo, USA, United StatesLawrence Livermore National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 2019
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