Shelfwide Cruise2017-01-25T08:18:09+00:00

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2018 Shelfwide Cruise: July 23 - July 30

Cruise Dedication

The 2018 shelf-wide cruise to determine the extent of low oxygen bottom waters on the Louisiana-Texas continental shelf is dedicated to the memory of Dr. Wesley J. Tunnell, Jr. who passed away on Saturday, July 14, 2018, after a long successful and not successful battle with cancer. Wes was a founding member of the Seven and One-Half Fathom Reef research team, students of Dr. Alan H. Chaney of Texas A&I University, Kingsville, who studied a Pleistocene reef off south Padre Island as a hotspot of biodiversity. This group includes Wes, Tom Shirley, Billy Causey, Darryl Felder, Jim Davis, Don Harper and Nancy Rabalais. I hope I have not forgotten anyone. We all continue in Gulf of Mexico and other areas of marine science, and will continue to do so, just as Wes continued in his quest for research and conservation that would benefit the whole Gulf of Mexico. I have been conducting these summer hypoxia surveys and other investigations since 1985. This summer of 2018 represents our 33rd year of studying low oxygen in the Gulf of Mexico, but not as long as I have known Wes as a leader in focusing on the health of the Gulf of Mexico. May he and the rest of us reach our Jimmy Buffet challenge of responding to the call of our mother ocean.

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Principal Investigators

  • Nancy N. Rabalais, LSU & LUMCON, Principal Investigator, Chief Scientist
  • Gene Turner, LSU, Principal Investigator


  • 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.