Journal of Paleolimnology

, Volume 48, Issue 1, pp 9–26 | Cite as

A multi-proxy record of the Last Glacial Maximum and last 14,500 years of paleoenvironmental change at Lone Spruce Pond, southwestern Alaska

  • Darrell S. Kaufman
  • Yarrow Axford
  • R. Scott Anderson
  • Scott F. Lamoureux
  • Daniel E. Schindler
  • Ian R. Walker
  • Al Werner
Original paper

Abstract

Sediment cores from Lone Spruce Pond (60.007°N, 159.143°W), southwestern Alaska, record paleoenvironmental changes during the global Last Glacial Maximum (LGM), and during the last 14,500 calendar years BP (14.5 cal ka). We analyzed the abundance of organic matter, biogenic silica, carbon, and nitrogen, and the isotope ratios of C and N, magnetic susceptibility, and grain-size distribution of bulk sediment, abundance of alder shrub (Alnus) pollen, and midge (Chironomidae and Chaoboridae) assemblages in a 4.7-m-long sediment sequence from the depocenter at 22 m water depth. The basal unit contains macrofossils dating to 25–21 cal ka (the global LGM), and is interpreted as glacial-lacustrine sediment. The open water requires that the outlet of the Ahklun Mountain ice cap had retreated to within 6 km of the range crest. In addition to cladocerans and diatoms, the glacial-lacustrine mud contains chironomids consistent with deep, oligotrophic conditions; several taxa associated with relatively warm conditions are present, suggestive of relative warmth during the global LGM. The glacial-lacustrine unit is separated from the overlying non-glacial lake sediment by a possible disconformity, which might record a readvance of glacier ice. Non-glacial sediment began accumulating around 14.5 cal ka, with high flux of mineral matter and fluctuating physical and biological properties through the global deglacial period, including a reversal in biogenic-silica (BSi) content during the Younger Dryas (YD). During the global deglacial interval, the δ13C values of lake sediment were higher relative to other periods, consistent with low C:N ratios (8), and suggesting a dominant atmospheric CO2 source of C for phytoplankton. Concentrations of aquatic faunal remains (chironomids and Cladocera) were low throughout the deglacial interval, diversity was low and warm-indicator taxa were absent. Higher production and air temperatures are inferred following the YD, when bulk organic-matter (OM) content (LOI 550 °C) increased substantially and permanently, from 10 to 30 %, a trend paralleled by an increase in C and N abundance, an increase in C:N ratio (to about 12), and a decrease in δ13C of sediment. Post-YD warming is marked by a rapid shift in the midge assemblage. Between 8.9 and 8.5 cal ka, Alnus pollen tripled (25–75 %), followed by the near-tripling of BSi (7–19 %) by 8.2 cal ka, and δ15N began a steady rise, reflecting the buildup of N and an increase in denitrification in soils. Several chironomid taxa indicative of relatively warm conditions were present throughout the Holocene. Quantitative chironomid-based temperature inferences are complicated by the expansion of Alnus and resulting changes in lake nutrient status and production; these changes were associated with an abrupt increase in cladoceran abundance and persistent shift in the chironomid assemblage. During the last 2,000 years, chironomid-assemblage changes suggest cooler temperatures, and BSi and OM values were generally lower than their maximum Holocene values, with minima during the seventh and eighth centuries, and again during the eighteenth century.

Keywords

Quaternary paleoenvironments Lake Sediment Alaska Midges Pollen Biogenic silica Magnetic susceptibility Carbon and nitrogen isotopes 

Notes

Acknowledgments

We thank M Arnold and C Schiff for assistance in the field, and V Chavez, E Helfrich, C Schiff, K Cooper, M Nasto, D West, and staff of the Colorado Plateau Analytical Lab for their work in the laboratories. E Barley shared her training set data and advice on midge taxonomy. M Edwards, V Markgraf and two anonymous reviewers provided helpful comments. CH2MHill Polar Services and US Fish & Wildlife Service Dillingham Office provided logistical support. This research was funded by NSF grants EAR-0823522 and -0904396 and ARC-0909332 and -0909347.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Darrell S. Kaufman
    • 1
  • Yarrow Axford
    • 2
  • R. Scott Anderson
    • 1
  • Scott F. Lamoureux
    • 3
  • Daniel E. Schindler
    • 4
  • Ian R. Walker
    • 5
  • Al Werner
    • 6
  1. 1.School of Earth Sciences and Environmental SustainabilityNorthern Arizona UniversityFlagstaffUSA
  2. 2.Department of Earth and Planetary SciencesNorthwestern UniversityEvanstonUSA
  3. 3.Department of GeographyQueen’s UniversityKingstonCanada
  4. 4.School of Aquatic and Fishery SciencesUniversity of WashingtonSeattleUSA
  5. 5.Department of BiologyUniversity of British Columbia OkanaganKelownaCanada
  6. 6.Department of Geology and GeographyMount Holyoke CollegeSouth HadleyUSA

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