Working Paper Article Version 1 This version is not peer-reviewed

Climate during the Last Glacial Maximum in the Northern Sawatch Range, Colorado, USA

Version 1 : Received: 6 September 2019 / Approved: 8 September 2019 / Online: 8 September 2019 (15:59:45 CEST)

How to cite: Brugger, K.A.; Ruleman, C.A.; Caffee, M.W.; Mason, C.C. Climate during the Last Glacial Maximum in the Northern Sawatch Range, Colorado, USA. Preprints 2019, 2019090085 Brugger, K.A.; Ruleman, C.A.; Caffee, M.W.; Mason, C.C. Climate during the Last Glacial Maximum in the Northern Sawatch Range, Colorado, USA. Preprints 2019, 2019090085

Abstract

Temperature-index modeling is used to determine the magnitude of temperature depression in the northern Sawatch Range required to maintain steady-state mass balances of six reconstructed glaciers at their extent during the local Last Glacial Maximum (LLGM), dated at ~21 ka. Assuming no significant differences in precipitation compared to modern values, mean annual temperatures in the region were on average 8.8 +0.5/–0.8 °C cooler than they are today. Allowing for modest increases or decreases in precipitation, required temperature depressions only differ by ± 0.2 °C. Temperature depression in the northern Sawatch Range are consistent, although slightly greater, with those determined in other ranges in Colorado using similar approaches. The estimates presented here are, however, substantially less than those suggested by several downscaled simulations of global LGM climate, that might be due to the need for improved calibration of such downscalings, or the models from which they are derived. Our estimates of LGM temperature depression are considerably greater than that previously determined in the study area and those in two other ranges in Colorado derived using different methodologies, the latter being most likely responsible for the discrepancies.

Subject Areas

Last Glacial Maximum; paleoclimate; temperature-index model; Sawatch Range; Colorado

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.