Reconstructing postglacial hydrologic and environmental change in the eastern Kenai Peninsula lowlands using proxy data and mass balance modeling

Despite extensive paleoenvironmental research on the postglacial history of the Kenai Peninsula, Alaska, uncertainties remain regarding the region's deglaciation, vegetation development, and past hydroclimate. To elucidate this complex environmental history, we present new proxy datasets from Hidden and Kelly lakes, located in the eastern Kenai lowlands at the foot of the Kenai Mountains, including sedimentological properties (magnetic susceptibility, organic matter, grain size, and biogenic silica), pollen and macrofossils, diatom assemblages, and diatom oxygen isotopes. We use a simple hydrologic and isotope mass balance model to constrain interpretations of the diatom oxygen isotope data. Results reveal that glacier ice retreated from Hidden Lake's headwaters by ca. 13.1 cal ka BP, and that groundwater was an important component of Kelly Lake's hydrologic budget in the Early Holocene. As the forest developed and the climate became wetter in the Middle to Late Holocene, Kelly Lake reached or exceeded its modern level. In the last ca. 75 years, rising temperature caused rapid changes in biogenic silica content and diatom oxygen isotope values. Our findings demonstrate the utility of mass balance modeling to constrain interpretations of paleolimnologic oxygen isotope data, and that groundwater can exert a strong influence on lake water isotopes, potentially confounding interpretations of regional climate.

Deglaciation · Diatom · Geochemistry · Geography · Geomorphology · Glacier · Holocene · Isotopes of oxygen · Macrofossil · Physical geography · Climate change and permafrost · Cryospheric studies and observations · Geology · Geology and Paleoclimatology Research · Oceanography

• Late-Glacial and Holocene Lake-Level Fluctuations on the Kenai Lowland, Reconstructed from Satellite-Fen Peat Deposits and Ice-Shoved Ramparts, Kenai Peninsula, Alaska

  Open Access•Edward E Berg, Darrell S Kaufman et al.•Quaternary•2022

  Incluir item

• Timing and extent of Late Pleistocene glaciation in the Chugach Mountains, Alaska

  Open Access•Joshua D Valentino, Joshua Valentino et al.•Quaternary Research•2021

  Incluir item

• The magnitude of error in conventional bulk-sediment radiocarbon dates from central North America

  Open Access•Eric C Grimm, L James Maher et al.•Quaternary Research•2009

  Incluir item

• Late Quaternary megafloods from Glacial Lake Atna, Southcentral Alaska, U.S.A.

  Open Access•Michael Wiedmer, David R Montgomery et al.•Quaternary Research•2010

  Incluir item

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

  Open Access•Lesleigh Anderson, Mark B Abbott et al.•Quaternary Research•2005

  Incluir item

• Holocene storminess inferred from sediments of two lakes on Adak Island, Alaska

  Open Access•Anne C L Krawiec, Darrell S Kaufman•Quaternary Research•2014

  Incluir item

• The freshwater reservoir effect in radiocarbon dating

  Open Access•Bente Philippsen•Heritage Science•2013

  Incluir item

• Stable isotopes in precipitation

  Open Access•W Dansgaard•Tellus A Dynamic Meteorology and…•2012

  Incluir item

• A Theory of Gradient Analysis

  Cajo J F Ter Braak, I Colin Prentice•Advances in Ecological Research•1988

  Incluir item

• Natural evaporation from open water, bare soil and grass

  Open Access•Howard Latimer Penman•Proceedings of the Royal Society…•1948

  Incluir item

• The NCEP/NCAR 40-Year Reanalysis Project

  Eugenia Kalnay, Masao Kanamitsu et al.•Bulletin of the American…•1996

  Incluir item

• Macintosh Program performs time‐series analysis

  Open Access•Didier Paillard, Laurent Labeyrie et al.•Eos•1996

  Incluir item

• Controlling the False Discovery Rate

  Open Access•Yoav Benjamini, Yosef Hochberg•Journal of the Royal Statistical…•1995

  Incluir item

• Flexible paleoclimate age-depth models using an autoregressive gamma process

  Open Access•Martijn Blaauw, Maarten Blaauw et al.•Bayesian Analysis•2011

  Incluir item

• Coniss

  Open Access•Eric C Grimm•Computers & Geosciences•1987

  Incluir item

• Late-Glacial and Holocene Lake-Level Fluctuations on the Kenai Lowland, Reconstructed from Satellite-Fen Peat Deposits and Ice-Shoved Ramparts, Kenai Peninsula, Alaska

  Open Access•Edward E Berg, Darrell S Kaufman et al.•Quaternary•2022

  Incluir item

• Reconciling diverse diatom-based lake responses to climate change in four mountain lakes in the South-Carpathian Mountains during the last 17 kyrs

  Open Access•Krisztina Buczkó, Erzsébet Szurdoki et al.•Quaternary International•2018

  Incluir item

• Enhanced Late Holocene Enso/PDO expression along the margins of the eastern North Pacific

  Open Access•John A Barron, Lesleigh Anderson•Quaternary International•2011

  Incluir item

• Holocene development of Boreal forests and fire regimes on the Kenai Lowlands of Alaska

  R Scott Anderson, Douglas J Hallett et al.•The Holocene•2006

  Incluir item

• Holocene biogeography of Tsuga mertensiana and other conifers in the Kenai Mountains and Prince William Sound, south-central Alaska

  Open Access•R Scott Anderson, Darrell S Kaufman et al.•The Holocene•2016

  Incluir item

• The Mt Logan Holocene—late Wisconsinan isotope record

  Open Access•David Fisher, E C Osterberg et al.•The Holocene•2008

  Incluir item

• AMS 14 C Sample Preparation at the KCCAMS/UCI Facility

  Open Access•G M Santos, R B Moore et al.•Radiocarbon•2007

  Incluir item

• The IntCal20 Northern Hemisphere Radiocarbon Age Calibration Curve (0–55 cal kBP)

  Open Access•Paula J Reimer, William E N Austin et al.•Radiocarbon•2020

  Incluir item