Mar. 11, 2010 - 2010 Amazon Cruise Blog
Feb. 22, 2010 - USF News: Scientist Finds "Little Ice Age" Had Dramatic Effect on Gulf
Feb. 19, 2010, 2010 - USF News: Amazon Expedition in Search of Climate Clues
My research interests involve merging organic geochemical proxies with more traditional proxies (e.g. foraminiferal geochemistry) for the reconstruction of decadal to centennial scale climate variability over the past 2 millennia. My dissertation research has been focused specifically on climate reconstruction in the subtropical north Atlantic region (Gulf of Mexico) and the southeastern U.S. (Lake Tulane).
1) Reconstruction of high-resolution sea-surface temperature and salinity variability in the Gulf of Mexico using
paired Mg/Ca and oxygen isotopic composition of planktonic foraminifera
2) Comparison of the molecular organic SST proxy,TEX86, with foraminifera-based Mg/Ca-SST in co-occurring sediments, and
implications for reconstructing water column structure
3) Assessing North American continental paleohydrology by looking at variability in terrestrial input to the Gulf of
Mexico (via the Mississippi River), using lithogenic (%titanium, %insoluable residue) and molecular organic
(long-chain n-alkanes) proxies.
4) Reconstruction of hydrologic conditions in Florida over the past 2000 years using compound specific hydrogen
isotopic composition from Lake Tulane sediments (D/H in fatty acids).
Publications & Presentations
Richey, JN, Poore, RZ, Flower, BP, Quinn, TM, 2007, A 1400-year multi-proxy
record of climate variability from the northern Gulf of Mexico, Geology,
v.35, p. 423-426, doi: 10.1130/G23507A. (PDF
Richey, JN, Poore, RZ, Flower, BP, Hollander, DJ and Quinn, TM, 2009, Regionally Coherent Little Ice Age Cooling in the Atlantic Warm Pool, Geophysical Research Letters, v.36, L21703, doi: 10.1029/2009GL040445. (PDF, 321K)
Science Crew of the 2007 Gulf of Mexico Cruise on the RV Pelican: Jen Flannery, Julie Richey, Tim Ourbak, Chris Maupin and David Hollander
The USF (and NIOZ) Science Crew of the 2010 Amazon Cruise on the RV Knorr: Kara Radabaugh, Enrique Montes, David Hollander, Claudia Zell, Carlie Williams and Julie Richey
Julie Richey, Kara Radabaugh and Carlie Williams sub-sampling a box core: We use box cores taken from areas of the ocean floor with high sedimentation rates (>40 cm of sediment accumulation per 1000 years) to reconstruct decadal to centennial-scale climate variability over the past 1000-2000 years. By taking a large 6" diameter sub-core, we can get 100 cubic centimeters of sediment per 5 mm slice of core. This allows us to do both foraminiferal and organic geochemical analyses on the same core material.
Sailing into the Intertropical Convergence Zone in the Western Tropical Atlantic Ocean, on board the RV Knorr