Reconstruction of late Quaternary paleohydrologic Conditions in southeastern British Columbia using visible derivative spectroscopy of Cleland Lake Sediment

Datos Bibliográficos

ID24085147
AutoresLorita N Mihindukulasooriya, Lorita Mihindukulasooriya (Kent State University, autor de correspondencia), Joseph D Ortiz (0000-0002-6583-3850, Kent State University), David P Pompeani (0000-0002-3571-4586, Planetary Science Institute), Byron A Steinman (0000-0003-2256-1856, University of Minnesota, Duluth), Mark B Abbott (0000-0002-0299-928X, Planetary Science Institute)
Año2015
Volumen83
Número3
Páginas531-544
Fecha de publicación2015-05-01
Peer ReviewedSí
Open AccessSí
TipoARTICLE
RevistaQuaternary Research (JOURNAL)
Identificadores de la revistaISSN: 0033-5894 • E-ISSN: 1096-0287
EditorialCambridge University Press (CUP) (PUBLISHER)
DOI10.1016/j.yqres.2015.02.003
OpenAlexW2075106250
IdiomaEN
Referencias citadas95

Visible derivative spectroscopy (VDS) analysis of sediment from Cleland Lake, Southeastern British Columbia provides a reconstruction of paleolimnological productivity and hydrologic change during the past 14,000 calibrated 14 C years before present (cal yr BP). The first five principal components (PC) of the VDS data explain 97% of the variance in the VDS data set. Four PCs correlate with standard reflectance derivative spectra for diatom, dinoflagellate algae, and cyanophyte pigments that record ecological change, while two PCs are paleohydrologic indicators. Dinoflagellate algae are predominant from 11,600 to 8600 cal yr BP then decrease to low levels after ~ 8500 cal yr BP. PCs 3–5 represent variations in cyanophyte abundance and exhibit peaks from 14,000 to 11,600, 14,000 to 9500, and 6100 to 5400 cal yr BP, respectively. Conditions shifted toward favoring diatoms around 9400 and lasted until 170 cal yr BP. Higher dinoflagellate-related pigment concentrations suggest a lower lake level from 11,600 to 8600 cal yr BP, followed by higher water levels and wetter conditions after 8500 cal yr BP. We propose that drier conditions transitioning from the late glacial into the Holocene were caused by summer insolation-driven, non-linear feedbacks between the northern hemisphere subtropical high-pressure systems, vegetation, and soil moisture.

Algae · Biogenic silica · Biology · Bloom · Climatology · Diatom · Dinoflagellate · Holocene · Northern Hemisphere · Sediment · Subtropics · Temperate climate · Vegetation (pathology) · Ecology · Geochemistry and Geologic Mapping · Geology · Geology and Paleoclimatology Research · Isotope Analysis in Ecology · Oceanography · Paleontology