Abstract
Sub-centennial oxygen (δ18O) 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 δ18O values range from −16‰ to −21‰ and are presently similar to modern lake water and annual precipitation values. Ostracod δ18O record near identical trends with calcite, offset by +1.7 ± 0.6‰. At 11 ka BP (kaBP = thousands of years before 1950), higher δ18O values reflect decreased precipitation−evaporation (P−E) balance from residual ice sheet influences on moisture availability. A trend to lower δ18O values until ∼8 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. © 2021. American Geophysical Union. All Rights Reserved.
| Original language | English (US) |
|---|---|
| Article number | e2021GL092948 |
| Number of pages | 9 |
| Journal | Geophysical Research Letters |
| Volume | 48 |
| Issue number | 16 |
| DOIs | |
| State | Published - Aug 16 2021 |
Bibliographical note
Funding Information:This project was made possible by U.S. National Science Foundation (NSF) Grant number 0296157 to M. B. Abbott, NSF Grant number 0097127 to B. P. Finney, and the U.S Geological Survey Climate Research and Development Program. We thank B. Friedrichs and J. Abbott for their assistance in the field, H. Rowe at the University of Kentucky and D. Dettman at the University of Arizona for isotope analysis, C. Weiss and S. Christiansen for lab assistance, R. Pelltier for GIS analysis, and the editor, Z. Lundeen and two anonymous reviewers whose comments improved the manuscript. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Funding Information:
This project was made possible by U.S. National Science Foundation (NSF) Grant number 0296157 to M. B. Abbott, NSF Grant number 0097127 to B. P. Finney, and the U.S Geological Survey Climate Research and Development Program. We thank B. Friedrichs and J. Abbott for their assistance in the field, H. Rowe at the University of Kentucky and D. Dettman at the University of Arizona for isotope analysis, C. Weiss and S. Christiansen for lab assistance, R. Pelltier for GIS analysis, and the editor, Z. Lundeen and two anonymous reviewers whose comments improved the manuscript. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Publisher Copyright:
© 2021. American Geophysical Union. All Rights Reserved.
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