Mid-Holocene climate in Northern Minnesota

Quaternary Research
By: , and 

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Abstract

Study of Holocene ostracodes and diatoms from Elk Lake, in North-Central Minnesota, indicates that the local climate of the mid-Holocene can be subdivided into three intervals. Throughout interval 1 (ca. 7800 to 6700 yr B.P.), climate was colder and much drier than today. During intervals 2 and 3 (ca. 6700 to 4000 yr B.P.) average mean-annual air temperatures approached the modern mean (3.7??C), but warm summers persisted throughout interval 2, whereas during interval 3 warm summers fell into discrete episodes. Furthermore, average mean-annual precipitation was about 85 and 90% of modern during intervals 2 and 3, respectively. Transition times between the principal intervals were less than 50 yr. The expected effects of a retreating Laurentide Ice Sheet that initially maintained a winter-style circulation, followed by transitional climate states, and finally a near-modern circulation pattern may explain these local climatic events. ?? 1987.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Mid-Holocene climate in Northern Minnesota
Series title Quaternary Research
DOI 10.1016/0033-5894(87)90064-0
Volume 28
Issue 2
Year Published 1987
Language English
Publisher Elsevier
Publisher location Amsterdam, Netheralnds
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Quaternary Research
First page 263
Last page 273