NOAA's Hypoxia Watch project provides near-real-time maps of dissolved oxygen near the sea floor on the Texas-Louisiana-Florida continental shelf. Scientists aboard the NOAA Research Vessel Oregon II collect seawater properties like temperature, salinity, chlorophyll, and dissolved oxygen at approximately 240 station locations during annual summer cruises. The project, run by NOAA National Centers for Environmental Information and Mississippi Laboratories, has been operational since 2001, with data collection typically from early June to mid-July.
Use Cases
- Mapping hypoxic zones by analyzing dissolved oxygen measurements from CTD stations.
- Studying seasonal water quality trends using time-series data on temperature and salinity.
- Correlating chlorophyll measurements with nutrient runoff and algal bloom events.
- Modeling the spatial extent of low-oxygen conditions from contour map data generated every 3-5 days during cruises.
Strengths
- Data collection spans over two decades, from 2001 to 2021.
- Measurements are taken at approximately 240 station locations per cruise.
- Near-real-time data processing with maps published every 3-5 days during the 6-week cruise period.
Limitations
- Primary temporal coverage is limited to a 6-week window each summer, with only one recorded fall cruise in 2008.
- Spatial coverage is restricted to the cruise track from Brownsville, Texas, to the Mississippi River and Florida waters.
- Specific sample size (row count) and data granularity per station are unknown.
Provenance
- Source
- NOAA National Centers for Environmental Information (NCEI) and NOAA National Marine Fisheries Service Mississippi Laboratories.
- Collection Method
- In-situ measurements collected by scientists aboard the NOAA Research Vessel Oregon II using CTD (Conductivity, Temperature, Depth) sensors and electronic dissolved oxygen sensors, validated with periodic chemical analyses.
- Time Range
- 2001 to 2021, with primary cruises from early June to mid-July annually.
- Freshness
- Annual summer collection; last recorded update was July 20, 2021.
- Geography
- Gulf of Mexico, specifically the Texas-Louisiana-Florida continental shelf from Brownsville, Texas, to the mouth of the Mississippi River and into Florida waters.