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• W3201941977 endingPage "107192" @default.
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• W3201941977 abstract "Sediment-based lake-level reconstructions and the oxygen isotopic composition of lacustrine carbonate (δ 18 O CO3 ) provide insight on hydroclimate conditions during the early Holocene in western North America and the Pacific Northwest. There are relatively few such records with decadal temporal resolution, and changes in the isotopic composition of meteoric water potentially obscure the hydroclimate signal (precipitation-evaporation) in lacustrine δ 18 O CO3 data. Here, we present a Holocene-length drought index developed by combining the δ 18 O CO3 record from Castor Lake, a closed-basin system located in north-central Washington (USA), with the δ 18 O CO3 record from Lime Lake, which has an open-basin configuration and is located in northeastern Washington. The lake sediment records are dated using primarily a combination of radiocarbon measurements on terrestrial macrofossils, Pb-210, Cs-137, and tephrochronology . The δ 18 O CO3 drought index, along with changes in Castor Lake sediment facies , suggest periods of prolonged drought in the Pacific Northwest between 11,200 and 6200 cal yr BP, a finding that is supported by other lacustrine proxy records of lake level and temperature change. Early Holocene drought likely resulted from higher than present summer isolation that promoted longer, hotter summers and greater evaporation. Lower than present winter insolation at this time likely altered the location and/or strength of the westerlies, reducing cold season precipitation/snowpack and intensifying the dry conditions. This study highlights the sensitivity of hydroclimate in an already drought- and fire-prone region to the magnitude and duration of summer warmth and precipitation and snowpack levels during the winter. • We present a Holocene drought index for the Pacific Northwest of North America. • Lake records indicate low lake levels and a prolonged dry period from ∼11.2 to 6.2 cal kyr BP. • Summer insolation maxima resulted in hotter, drier summers that lowered lake levels. • Winter insolation minima weakened westerlies, reducing cold season precipitation." @default.
• W3201941977 created "2021-10-11" @default.
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• W3201941977 date "2021-11-01" @default.
• W3201941977 modified "2023-09-27" @default.
• W3201941977 title "Prolonged early to middle Holocene drought in the Pacific Northwest inferred from lacustrine carbonate oxygen isotope values and sedimentology" @default.
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• W3201941977 doi "https://doi.org/10.1016/j.quascirev.2021.107192" @default.
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