N-Alkane evidence for the onset of wetter conditions in the Sierra Nevada, California (USA) at the mid-late Holocene transition, ~3.0ka

Joseph H. Street, R. Scott Anderson, Robert J. Rosenbauer, Adina Paytan

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

n-Alkane biomarker distributions in sediments from Swamp Lake (SL), in the central Sierra Nevada of California (USA), provide evidence for an increase in mean lake level ~3000yr ago, in conjunction with widespread climatic change inferred from marine and continental records in the eastern North Pacific region. Length distributions of n-alkane chains in modern plants growing at SL were determined and compared to sedimentary distributions in a core spanning the last 13ka. As a group, submerged and floating aquatic plants contained high proportions of short chain lengths (<nC25) compared to emergent, riparian and upland terrestrial species, for which chain lengths >nC27 were dominant. Changes in the sedimentary n-alkane distribution over time were driven by variable inputs from plant sources in response to changing lake level, sedimentation and plant community composition. A shift toward shorter chain lengths (nC21, nC23) occurred between 3.1 and 2.9ka and is best explained by an increase in the abundance of aquatic plants and the availability of shallow-water habitat in response to rising lake level. The late Holocene expansion of SL following a dry mid-Holocene is consistent with previous evidence for increased effective moisture and the onset of wetter conditions in the Sierra Nevada between 4.0 and 3.0ka.

Original languageEnglish (US)
Pages (from-to)14-23
Number of pages10
JournalQuaternary Research (United States)
Volume79
Issue number1
DOIs
StatePublished - Jan 1 2013

Keywords

  • Holocene
  • Lake level
  • Paleoclimate
  • Paleolimnology
  • Plant n-alkanes
  • Sierra Nevada

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

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