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Article Excerpt
Chair: Stephen Howden, University of Southern Mississippi
Vice-chair: Zikri Arslan, Jackson State University
FRIDAY MORNING
Bost Auditorium North
10:30 Poster Session
MEASUREMENTS OF SOLAR IRRADIANCE WITH A MULTIFILTER ROTATING SHADOWBAND RADIOMETER (MFRSR)
R.Suseela Reddy, Sridhar Kota*, Umesh Remata, Rush Lockhart, Harene Natarajan, and R.Karim, Jackson State University, Jackson, MS 39217
The Jackson State University Meteorology Program (JSUMP) recently installed a Multifilter Rotating Shadowband Radiometer (MFRSR) through a collaborative effort with the NOAA Center for Atmospheric Sciences (NCAS) at Howard University. The MFRSR is currently in operation and measures global, diffuse and direct normal components of Spectral Solar Irradiance, in six narrow bands approximately 10 nm wide. The data resulted from the measurements were used in the computations of aerosol, water vapor, and ozone optical depths. The data for Solar Irradiance were considered for clear day (Oct. 9th, 2006) as well as cloudy day (Oct. 2nd, 2006) skies to study the effect of clouds on Radiation. The results indicated that no atmospheric effects were observed in the variation of total solar irradiance during clear skies. During cloudy skies the atmospheric effects were observed due to clouds. Validation of data with satellite measurements will be discussed. JSU will continue measurements of solar and atmospheric radiation and aerosols for climate studies and for long-range monitoring of Aerosol Radiation Network (AERADNET).
CHRONIC ACCUMULATION PROFILE OF CADMIUM, LEAD, AND MERCURY IN GOLDFISH
Cristina Nica (1*) 1, Zikri Arslan (1), Anthony J. Bednar (2), (1) Jackson State University, Jackson MS 39217 and (2) US Army Engineer Research and Development Center (ERDC), Vicksburg, MS 39180
Mercury, lead and cadmium are among the most toxic heavy metals. Under chronic exposure, fish accumulate these metals to higher levels in the internal organs. The magnitude of stress induced by each individual metal is not only dependent on the relative toxicity of the metal ion, but also the target organ impacted. In this study, the uptake profile and relative toxicity of Cd, Pb and Hg were studied using goldfish. Goldfish were exposed to individual metals for ten days in glass tanks. Two different concentrations of the metals were administered individually: low level (20 [micro]g/L for Hg and 100 [micro]g/L for Cd and Pb) and high level (50 [micro]g/L for Hg and 250 [micro]g/L for Cd and Pb). Lethal effects were observed for fish exposed to Cd and Hg within the first two days. Toxicity of Pb was less pronounced compared to that of Cd and Hg. Internal organs, including the liver, gill, kidney, and muscle tissue were removed from exposed fish and digested in teflon vessels by nitric acid. Two different Certified Reference Materials, dog fish liver (DOLT-1) and lobster hepatopancreas (TORT-2) were digested using the same procedure for quality control. Samples were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The magnitude of accumulation was higher in fish exposed low levels of metals. Levels of Cd were consistently high in the kidney, while mercury accumulated in the gills, and lead in gills and muscles to higher levels.
FALL POST-LARVAL PENAEID SHRIMP IMMIGRATION INTO A MISSISSIPPI ESTUARY
Ryan Knobf (1*), Ricky Greer (1), John Anderson (2), and Harriet Perry (2), (1) Mississippi Gulf Coast Community College, Gautier, MS 39553, National Aeronautics and Space Administration, Stennis Space Center, MS 39522, (2) Gulf Coast Research Laboratory's J.L. Scott Marine Education Center (MEC), and Center for Fisheries Research and Development, Ocean Springs, MS 39564
The purpose of this project is to monitor the migration of postlarval penaeid shrimp into a Mississippi estuary during the fall season. Samples were taken with a beam plankton trawl at a single station along the marsh edge in Davis Bayou, Jackson County. Weekly sampling was conducted from mid-October through January. Water temperature, dissolved oxygen,...
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