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The Holocene
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Holocene stable-isotope stratigraphy at Lough Gur, County Limerick, Western Ireland

Karin Ahlberg

Limnological Research Center; University of Minnesota, 310 pillsbury drive, mineapolis, minnesota, USA

Elisabeth Almgren

Limnological Research Center; University of Minnesota, 310 pillsbury drive, mineapolis, minnesota, USA; Quaternary Geology, Uppsala University, S-752 36 Uppsala, Sweden

H. E. Wright, Jr

Limnological Research Center; University of Minnesota, 310 pillsbury drive, mineapolis, minnesota, USA; hew{at}tc.umn.edu

Emi Ito

Limnological Research Center; University of Minnesota, 310 pillsbury drive, mineapolis, minnesota, USA

After the pronounced fluictuation of 4{per thousand} in {delta}18O during the Younger Dryas and the 1{per thousand} dip during the Preboreal Oscillation, values for {delta}18O decreased very steadily from -2.5 to -5.3{per thousand} from 9300 to about 8000 14C yr BP (uncal.). This early-Holocene decrease of almost 3{per thousand} is interpreted as a result of a declinle of almost 6°C in the temperature of precipitation. The previous high temperature of much of the Lateglacial and the Preboreal (12000-9300 yr BP uncal.) may reflect warm summers related to greater insolation and warm winters caused by the influence of the Laurentide ice sheet on atmospheric circulation. After 8000 yr BP a disconformity interrupts the sequence, but after about 5000 yr BP the {delta}18O and {delta}13C are irregular because of a low lake level, as shown by the occurrence of littoral shells and woody detritus in the littoral core, and because of anthropogenic factors, as inferred from pollen indicators of forest disturbance and farming found in both the littoral and offshore cores.

Key Words: Palaeoclimate • stable isotopes • insolation • lake level • cultural impact • Holocene vegetation

The Holocene, Vol. 11, No. 3, 367-372 (2001)
DOI: 10.1191/095968301674434407
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