|2009 Portland GSA Annual Meeting (18-21 October 2009)|
|Paper No. 116-1|
|Presentation Time: 9:00 AM-6:00 PM|
A DIURNAL STUDY OF THE SEDIMENT BIOGEOCHEMISTRY OF WEEKS BAY DURING BOTTOM WATER HYPOXIC AND NORM-OXIC EVENTS
EZELL, John E., Geosciences, Mississippi State University, PO BOX 5448, Department of Geosciences, Mississippi State, MS 39762, email@example.com and MCNEAL, Karen S., Department of Geoscience, Mississippi State University, P.O. Box 5448, Mississippi State, MS 39762|
During the summers of 2008-2009 field research was conducted in Weeks Bay (WB),
Preliminary results indicated O2 levels were usually greater at the surface (~11mg/L) than near the bottom of the water column (~6mg/L) and were lower at night than during the day (~3mg/L). Laboratory analysis indicated that sulfide migrated upward during low O2 events, was found at greater depths (~4.5mm vs. <1mm), and in much lower concentrations (~5uM vs. ~120uM) than during norm-oxic periods. Anion analysis from the first sampling season showed the following levels: NO32- (<1 ppm), NO2- (BDL), PO43- (BDL to 9.2 ppm), SO42- (0.8 to 1327 ppm), and Cl- (13 to 11797 ppm). From the ten sites sampled, the site near the Magnolia River mouth showed the strongest tendency toward hypoxia (depth of 1.5m) whereas, the shallow site (depth 0.5m) isolated from the major water currents in the bay, showed the least tendency toward hypoxia. Many factors affect hypoxia formation and its associated changes, and WB is no exception to this phenomenon. The findings from this research should assist decision makers and managers in their understanding of the hypoxic events, geochemical response, sediment-pelagic coupling, and the spatial extent of hypoxia in WB.
2009 Portland GSA Annual Meeting (18-21 October 2009)
General Information for this Meeting
|Session No. 116--Booth# 357|
Diurnal Biogeochemical Processes in Rivers, Lakes, and Shallow Groundwater (Posters)
Oregon Convention Center: Hall A
9:00 AM-6:00 PM, Monday, 19 October 2009
Geological Society of America Abstracts with Programs, Vol. 41, No. 7, p. 322
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