Current Projects of the Sedimentary Records of Environmental Change lab
Measuring biogenic silica
content of lake sediments from Scandinavia to investigate warm and cold periods
during the last deglaciation.
Biogenic silica analyses provides a measure of lake productivity. Lake
productivity is controlled, in part by climate.
To learn more about this project, ARCTREC, visit
changes in the North Pacific region over the past several thousand years using
the oxygen-isotope composition of diatoms extracted from lake sediment.
Changes in the strength and position of the Aleutian Low influence the storm
tracks that intersect south Alaska. A current
hypothesis is that these changes are recorded in the oxygen isotopes ratios of diatoms
which incorporate oxygen from precipition into their silica structure during
Quantifying summer temperature
fluctuations during the last several thousand years using the concentration of
sedimentary algae (biogenic silica) from arctic, sub-arctic, and alpine lakes. Much of the analyses completed in our lab
will be incorporated into a special volume for the Journal of
Paleolimnology. The special volume is
one product of the 2000 Years of Climate Variability from Arctic Lakes project.
hydrogeographic and climatologic changes at Bear Lake, Utah-Idaho, using the
oxygen-isotope composition of carbonate from a continuous sediment core
extending back 250,000 years. Visit the project website for
more information: http://esp.cr.usgs.gov/info/lacs/ or read a recent
Using ostracode species
assemblages to reconstruct the environmental conditions of pluvial lakes in the
Mojave Desert during the last ice age. Visit the project website for more
Assessing the frequency of
eruptions from Aleutian Arc volcanoes using ash deposits and other features
preserved in lake sediment from southern Alaska. Holocene
tephra-fall records have been obtained from the base of Mt. Redoubt and from
lakes on the Kenai Peninsula. This summer, we will return to a lake at the
base of Iliamna Volcano to recover sediment cores from the volcano-proximal