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2021 Oregon II 340 Hypoxia Watch Bottom Dissolved Oxygen Contours

Metadata Updated: October 6, 2023

The NOAA Hypoxia Watch project provides near-real-time, web-based maps of dissolved oxygen near the sea floor over the Texas-Louisiana continental shelf during a period that extends from mid-June to mid-July. The NOAA National Marine Fisheries Service Mississippi Laboratories at Pascagoula and Stennis Space Center and the NOAA's National Centers for Environmental Information (NCEI) began the Hypoxia Watch project in 2001. Scientists aboard the NOAA Research Vessel Oregon II measure seawater properties, such as water temperature, salinity, chlorophyll, and dissolved oxygen, as the Oregon II cruises the waters south of Pascagoula, MS and then makes its way from Brownsville, Texas, to the mouth of the Mississippi River. A scientist aboard the ship processes the measurements from electronic dissolved oxygen sensors, checks the measurements periodically with chemical analyses of the seawater, then sends the data by FTP to the NCEI approximately every three to four days. Physical Scientists at NCEI transform the dissolved oxygen measurements into contour maps, which identify areas of low oxygen, or hypoxia. During the cruise, as the data is received from the ship, NCEI generates new maps and publishes them on the web. The first map will usually cover an area off the Mississippi coast, successive maps will add areas of the continental shelf from Brownsville to Corpus Christi, and the final map will usually cover the entire Texas-Louisiana-Mississippi coast. Maps are published every three to four days from approximately June 22 to July 20.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date October 5, 2023
Metadata Created Date August 13, 2021
Metadata Updated Date October 6, 2023
Reference Date(s) (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from NESDIS/NCEI/GIS

Graphic Preview

Hypoxia Contours 2021

Additional Metadata

Resource Type Dataset
Metadata Date October 5, 2023
Metadata Created Date August 13, 2021
Metadata Updated Date October 6, 2023
Reference Date(s) (publication)
Responsible Party NOAA National Centers for Environmental Information (Point of Contact)
Contact Email
Guid gov.noaa.ncei:Oregon340_Contours_2021
Access Constraints Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives., Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose., Cite as: NOAA National Centers for Environmental Information. 2021. Gulf of Mexico Hypoxia Watch Bottom Dissolved Oxygen Contours for June and July SEAMAP Cruise of 2021. NOAA National Centers for Environmental Information. Accessed [date].
Bbox East Long -90.100
Bbox North Lat 29.600
Bbox South Lat 26.000
Bbox West Long -97.400
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description Hypoxia Contours 2021
Graphic Preview File
Graphic Preview Type JPEG
Harvest Object Id 43cfd554-8cbd-451e-8dde-4484ba8565ff
Harvest Source Id 1451ffde-a127-4b4e-8fa1-a615a74536ba
Harvest Source Title NESDIS/NCEI/GIS
Licence Not to be used for navigation. Although these data are of high quality and useful for planning and modeling purposes, they are not suitable for navigation. For navigation, please refer to the NOS nautical chart series.
Metadata Language eng; USA
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-97.4, 26.0], [-90.1, 26.0], [-90.1, 29.6], [-97.4, 29.6], [-97.4, 26.0]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System urn:ogc:def:crs:EPSG::4269
Spatial Harvester True
Temporal Extent Begin 2021-07-04
Temporal Extent End 2021-07-20

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