Grant: $201,053 - National Science Foundation - Aug. 26, 2009
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Award Description: This work seeks to develop a new record of California hydroclimate since the last glacial maximum (LGM). This record will be based on the hydrogen (¥D), carbon (¥13C), and nitrogen (¥15N) isotopic compositions and elemental abundances (TOC, TN, C/N) of organic matter preserved in the sediments of Swamp Lake, a mid-elevation lake in the central Sierra Nevada. Compound-specific ¥D analyses of both aquatic and terrestrial plant leaf-wax biomarkers will provide an index of lake hydrologic balance and aridity, while the carbon and nitrogen proxies will provide a record of ecosystem responses to changing precipitation and temperature conditions. The combined record will be of sufficient resolution (~20-50 years) to reconstruct patterns of climatic variability and lake response on decadal to millennial timescales, and to evaluate the influence of proposed climate drivers (e.g., ENSO, PDO) over the entire Holocene The project started in July 2008. During the first 3 months of the project we have collected vegetation and water samples from the lake as well as a short push core. These samples will be used to define the isotopic signatures of potential vegetation and water sources to the lake. We have also coordinated with the closest location of which a long time series of precipitation data exists to obtain the data and we arranged for rain collection as close as possible for the site. The rain data will be useful to determine if and how lake water related or differs to the precipitation. We have also selected the relevant intervals in the core to use for the high resolution extraction of the biomarkers. A first set of samples will be analyzed in October and preliminary data presented at the AGU meeting in December.
Project Description: see award description
Jobs Summary: Laboratory Technician, Graduate Student Researcher, Student Laboratory Helper (Total jobs reported: 3)
Project Status: Less Than 50% Completed
This award's data was last updated on Aug. 26, 2009. Help expand these official descriptions using the wiki below.