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NEAR REAL TIME MAPPING OF BOTTOM HYPOXIA IN THE WESTERN AND NORTH-CENTRAL GULF OF MEXICO

This project aims to map bottom dissolved oxygen in near real time using CTD hydrocast data from SEAMAP summer surveys. The data will be distributed in GIS format through NOAA CoastWatch website.

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NEAR REAL TIME MAPPING OF BOTTOM HYPOXIA IN THE WESTERN AND NORTH-CENTRAL GULF OF MEXICO

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  1. NEAR REAL TIME MAPPING OF BOTTOM HYPOXIA IN THE WESTERN AND NORTH-CENTRAL GULF OF MEXICO L. Nelson May Jr. and Thomas D. Leming, Ph.D. U.S. Dept. of Commerce National Oceanic and Atmospheric Administration National Marine Fisheries Service Stennis Space Center, Mississippi

  2. OBJECTIVES • Map bottom dissolved oxygen in near real time using CTD hydrocast data acquired during the SEAMAP summer groundfish survey • Distribute the data in a GIS format through the NOAA CoastWatch Web site.

  3. Sea-Bird Electronics, Inc.Model 911+ CTD Sensors: • Primary and secondary temperature • Primary and secondary conductivity • Primary and secondary dissolved oxygen • Pressure • Transmissometer • Fluorometer • Photosynthetically-active radiation (PAR)

  4. CTD DeploymentNOAA Ship Oregon II

  5. CTD Hydrocast – Console View • CTD records data at a rate of 24 records/sec • Data displayed in real time in graphical and tabular formats

  6. Process and Quality Control the Datausing Sea-Bird Software Processed variables: • Depth (1 m bins) • Density (kg/m^3) • Water temperature (deg C) • Salinity (PSU) • Dissolved oxygen (mg/l) • Percent oxygen saturation • Transmittance (%) • Fluorescence (mg/^m3) • PAR

  7. Process CTD Data Acquired During Week 1

  8. Generate Summary File and Send Ashore • Assemble bottom oxygen and other data in comma-delimited file • Compress file and transmit to SSC attached to E-mail

  9. Grid and Contour Data with Surfer™ Software • Use Kriging Technique to Grid data • Export Contours as ArcView Polygon Shapefile and XYZ Grid File as ASCII file

  10. Import Bottom Oxygen Map into ArcView™

  11. Clip Map Area Outside of Station Cluster

  12. Correct Topology and Re-Link Oxygen Classes

  13. Final Version of the Map

  14. Post Maps on NOAA CoastWatch Web Site:http://coastwatch.noaa.gov/GOMxhypoxia

  15. Acquire and Process Data for Week 2

  16. Refresh Map and Post on Web Site

  17. Repeat Process with Week 3 Data

  18. Conclude Mapping with Week 4 Data

  19. Project Launched Summer 2001

  20. SEAMAP Bottom Oxygen Maps - 2002

  21. Cooperative Support for Nancy Rabalais’ Shelf-wide Hypoxia Survey • SEAMAP Survey Completed prior to Shelf-wide Survey • Provide SEAMAP Data to LUMCON Investigators

  22. Acknowlegements • NOAA CoastWatch Program • NOAA National Coastal Data Development Center • NASA Earth Science Applications Directorate • Coastal Ecology Institute, Louisiana State University

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