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2013 Shelfwide Cruise: July 21 - July 28


Research Activities

  • Nancy Rabalais, LUMCON, Lora Pride, Wendy Morrison, Amanda Fontenot, Elizabeth Robinson and Leslie Smith- general hydrography, chlorophyll , nutrients, suspended sediments, mapping of hypoxia, generation of maps and products for near real-time web site, preparation of data for long-term comparisons, http://www.gulfhypoxia.net
  • Matthew Rich and Mary-Kate Rogener (Brian Roberts, LUMCON, in absentia; Mandy Joye, UGA, in absentia) - nitrogen cycling, mainly denitrification, but also anammox and dissimiliatory nitrate reduction; quantify concentrations of N2O and CH4 in the water column; water column respiration, N2Ar ratios
  • Gene Turner, LSU - sulfide determinations, microbial bioassays, nutrients, TN, TP, TC
  • Jim Lee, LSU - profiles of photosynthetically active radiation, percent transmission and water temperature
  • Cameron Thrash, LSU, and Lauren Gillies, FSU - proteomic analysis of microbial communities in water and sediments in the hypoxic zone of the Gulf of Mexico
  • Xinping Hu (Assistant Professor, Texas A&M University, Corpus Christi) - pC02 and pH

Principal Investigators

  • Nancy Rabalais, PI/PD, Louisiana Universities Marine Consortium
  • Brian Roberts, Co-PI, Louisiana Universities Marine Consortium
  • Gene Turner, Co-PI, Louisiana State University


Data Quality Control and Quality Assurance

  • The final dissolved oxygen data will be corrected, as necessary, from linear regression with the Winkler titrations over a range of 0.22 to 8.43 mg/L. Initial observations indicate correction, but the f-factor for the Winkler standard remains to be verified. Any corrected data will be reflected in other derived measurements.
  • Salinity data not yet verified with PortaSal samples.
  • CTD data remain to be post-processed with ALIGN CTD to be applied.
  • Instrumentation was calibrated pre- and post-cruise according to manufacturer's specifications and standard method procedures were applied for several variables, not yet calculated, according to several LUMCON EPA-approved Quality Assurance Project Plans.
  • Data collected as part of process studies remain to be analyzed and synthesized.
  • Final QA/QC'd data will be submitted to NOAA NODC within two years of collection.