Regional atmospheric circulation change in the North Pacific during the Holocene inferred from lacustrine carbonate oxygen isotopes, Yukon Territory, Canada

Datos Bibliográficos

ID24088553
AutoresLesleigh Anderson (0000-0002-5264-089X, University of Massachusetts Amherst), M Abbott (0000-0003-1598-0390), Mark B Abbott (0000-0002-0299-928X, University of Pittsburgh), B Finney (0000-0002-2639-6512), S Burns (0000-0002-4971-3808), Stephanie A Burns (University of Massachusetts Amherst)
Año2005
Fecha de publicación2005-07-18
Peer ReviewedSí
Open AccessSí
TipoARTICLE
RevistaQuaternary Research (JOURNAL)
Identificadores de la revistaISSN: 0033-5894 • E-ISSN: 1096-0287
EditorialCambridge University Press (CUP) (PUBLISHER)
DOI10.1016/j.yqres.2005.03.008
OpenAlexW3156727668
IdiomaEN
Referencias citadas24

Analyses of sediment cores from Jellybean Lake, a small evaporation-insensitive groundwater-fed lake, provide a record of changes inNorth Pacific atmospheric circulation for the last ̈7500 yr at 5- to 30-yr resolution. Isotope hydrology data from the southern Yukonindicate that the oxygen isotope composition of water from Jellybean Lake reflects the composition of mean annual precipitation, d 18 O p .Recent changes in the d 18 O of Jellybean sedimentary calcite (d 18 O ca ) correspond to changes in the North Pacific Index (NPI), a measureof the intensity and position of the Aleutian Low pressure system (AL). This suggests that d 18 O p variability was related to the degree offractionation during moisture transport from the Gulf of Alaska across the St. Elias Mountains and that Holocene shifts were controlledby the intensity and position of the AL. Following this model, between ̈7500 and 4500 cal yr B.P., long-term trends suggest apredominantly weaker and/or westward AL. Between ̈4500 and 3000 cal yr B.P., the AL shifted eastward or intensified before shiftingwestward or weakening between ̈3000 and 2000 cal yr B.P. Rapid shifts eastward and/or intensification occurred ̈1000 and 90 cal yrB.P. Holocene changes in North Pacific atmospheric circulation inferred from Jellybean Lake oxygen isotopes correspond with lateHolocene glacial advances in the St. Elias Mountains, changes in North Pacific salmon abundance and shifts in atmospheric circulationover the Beaufort Sea.D 2005 University of Washington. All rights reserved.

Atmospheric Circulation · Atmospheric oxygen · Carbonate · Climatology · Geochemistry · Holocene · Isotopes of oxygen · Oxygen · Climate change and permafrost · Geology · Geology and Paleoclimatology Research · Methane Hydrates and Related Phenomena · Oceanography