Mark B. Abbott Lesleigh Anderson Lindsey Yasarer Michael Rosenheimer Bruce P. Finney G. Everett Lasher 2021 <div class="article-section__content en main"><p>Sub-centennial oxygen (<i>δ</i>¹⁸O) isotopes of ostracod and authigenic calcite from Squanga Lake provides evidence of hydroclimatic extremes and a series of post-glacial climate system reorganizations for the interior region of northwest Canada. Authigenic calcite<span>&nbsp;</span><i>δ</i>¹⁸O values range from −16‰ to −21‰ and are presently similar to modern lake water and annual precipitation values. Ostracod<span>&nbsp;</span><i>δ</i>¹⁸O record near identical trends with calcite, offset by +1.7&nbsp;±&nbsp;0.6‰. At 11&nbsp;ka BP (kaBP&nbsp;=&nbsp;thousands of years before 1950), higher<span>&nbsp;</span><i>δ</i>¹⁸O values reflect decreased precipitation−evaporation (P−E) balance from residual ice sheet influences on moisture availability. A trend to lower<span>&nbsp;</span><i>δ</i>¹⁸O values until ∼8&nbsp;ka BP reflects a shift to wetter conditions, and reorganization of atmospheric circulation. The last millennium and modern era are relatively dry, though not as dry as the early Holocene extreme. North Pacific climate dynamics remained an important driver of P−E balance in northwest Canada throughout the Holocene.</p></div> application/pdf 10.1029/2021GL092948 en American Geophysical Union Holocene hydroclimatic reorganizations in northwest Canada inferred from lacustrine carbonate oxygen isotopes article