Greenland Lake Sediments
Laminated west Greenland lake sediments as unique climatic and biogeochemical archives: Ice cores from the summit of the Greenland ice sheet have provided high-resolution Holocene temperature and precipitation records.
Greenland is characterized by large spatial variations in climate and its controlling factors. Notably, summit temperature shows little correlation, whereas southwest Greenland coastal temperature shows strong negative correlation with the North Atlantic Oscillation (NAO). We propose to construct new high-resolution decadal-scale records of temperature and effective precipitation for the past 8000 years from the laminated sediments of three closed basin lakes near the head of the Sndre Strmfjord, southern west Greenland. The proposed study is an outgrowth of our recent research (D'Andrea and Huang, 2005) that found unprecedented abundances of long chain alkenones in the sediments of these lakes. The molecular and D/H ratios of alkenones will allow quantitative reconstruction of temperature and effective precipitation, while biomarker abundances and isotope ratios will provide additional assessment of lake biogeochemical changes. Lacustrine alkenone producers have remained elusive to biogeochemists for over 20 years. Our study sites offer a unique opportunity to study the identity, diversity and evolution of alkenone producers in lakes using genetic sequencing and laboratory culturing, building upon our initial results indicating excellent preservation of haptophyte DNA in the sediments.
Brown faculty collaborators:
Other project collaborators:See publications list.
Site map of study region in Kangerlussuaq, Greenland
Yongsong Huang at Russell's Glacier in southwestern Greenland
The research team loads-up the whirlibird
Billy D'Andrea examines short-core from Braya So (lake) in Greenland
Yongsong Huang extrudes sediments from Braya So short-core
Musk Oxen roaming...in GreenlandBack to Yongsong Huang's Brown Research Profile