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2010 Shelfwide Cruise: July 24 - July 31

Daily 2010

Research Objectives

  • Mapping the extent of hypoxic water (< 2mg/L) across the Louisiana and Texas inner to mid continental shelf, along with associated physical, chemical and biological parameters. Associated rate measurements of biogeochemical processes.


  • Oxygen isotopes, respiration measurements
  • POC/PONspatial distribution;
  • Primary production with C14, nitrogen cycling with N15
  • Surface pCO2, alkalinity, pH, DIC; bottom water alkalinity, pH
  • Microassays for nutrient limitation of phytoplankton growth and microbial fingerprinting of substrates, surface and bottom water
  • Benthic foraminiferal distributions and assessment of living individuals (stating techniques) with depth in sediment cores
  • Sediment cores for paleoindicators of productivity and oxygen stress
  • Potential collection of water column and sediments for petroleum hydrocarbons

Principal Investigators

  • Nancy Rabalais, Louisiana Universities Marine Consortium
  • Brian Roberts, Louisiana Universities Marine Consortium
  • Geoff Sinclair, Louisiana Universities Marine Consortium
  • Dubravko Justic, Louisiana State University
  • Chunyan Li, Louisiana State University
  • Brian Fry, Louisiana State Unviersity
  • Don Scavia, University of Michigan


National Oceanic and Atmospheric Administration, Center for Sponsored Coastal Ocean Research, NGOMEX09: Integrated Ecosystem Modeling of the Causes of Hypoxia (Rabalais et al.), grant numbers NA09NOS4780204 to Louisiana Universities Marine Consortium and NA09NOS4780230 to Louisiana State University.

Disclaimer: 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.