HR: 1340h
AN: PP43A-0594    [Abstracts]
TI: Understanding the Recent Paleolimnological Record From Lake Monroe, FL
AU: * Carroll, B P
EM: carroll.b@fiu.edu
AF: Department of Earth Sciences, Florida International University, 11200 S.W. 8th Street, PC 344, Miami, FL 33199
AU: * Carroll, B P
EM: carroll.b@fiu.edu
AF: Southeast Environmental Research Center, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199
AU: Quillen, A
EM: amanda.quillen@fiu.edu
AF: Department of Biological Sciences, Florida International University, 11200 S.W. 8th Street, OE 246, Miami, FL 33199
AU: Anderson, W T
EM: andersow@fiu.edu
AF: Department of Earth Sciences, Florida International University, 11200 S.W. 8th Street, PC 344, Miami, FL 33199
AU: Anderson, W T
EM: andersow@fiu.edu
AF: Southeast Environmental Research Center, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199
AU: Gaiser, E E
EM: evelyn.gaiser@fiu.edu
AF: Southeast Environmental Research Center, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199
AU: Gaiser, E E
EM: evelyn.gaiser@fiu.edu
AF: Department of Biological Sciences, Florida International University, 11200 S.W. 8th Street, OE 246, Miami, FL 33199
AU: Scinto, L J
EM: leonard.scinto@fiu.edu
AF: Southeast Environmental Research Center, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199
AU: Engstrom, D R
EM: dengstrom@smm.org
AF: St. Croix Watershed Research Station, 16910 152nd Street North, Marine on St.Croix, MN 55047
AB: Calibration studies of lake sediments allows for an improved understanding of past changes in the climate system, which can also impact the biogeochemistry of a particular system. However, in shallow open basin lake systems, first-order changes in a climate system can impact these records in many ways. A relative rise in base level accompanying the rising sea-level since the last deglaciation can complicate lake sedimentological records near coastal zones. Here we present the preliminary multi-proxy paleolimnological investigation of Lake Monroe from a paleoclimatic and biogeochemical perspective. In order to further understand the spatial differences within the sedimentary record, 20 intact sediment cores (between 0.5m to 1m) were collected from the lake in October 2003 using a modified 5.4 cm inside diameter Wright-Livingston piston corer. Our approach combines geochemical, nutrient, and diatom analyses to reconstruct paleoclimate and biogeochemical changes in the study basin over the last 20,000 years of available material, using the modern record (last 100 yrs) as the calibration period. The lake, which is part of the upper St. Johns River, is shallow and hypereutrophic, and today is strongly affected by fluvial processes. However, our analyses thus far indicate that around 14,000 yrs ago the lake appeared to be more like a wetland. It is important to consider how first-order climate change can affect an archive's paleo-record before quantitative analyses can be conducted.
DE: 4808 Chemical tracers
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 1845 Limnology
DE: 1045 Low-temperature geochemistry
DE: 1615 Biogeochemical processes (4805)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting