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Sea Turtle Beaching Probability Index (BPI) in the Northern Gulf of Mexico dataset from 2017-01-01 to present

Metadata Updated: November 1, 2023

This dataset contains the sea turtle beaching probability index (BPI) for the northern Gulf of Mexico region since 2017-01-01. The data files are in CSV and JPEG formats. The daily CSV files contain beaching probability indexes with latitudes, longitudes, total accumulations, and stranding density log scaled radii (for plotting). The yearly CSV files contain daily accumulated BPI for the nine predefined regions. The daily JPEG files are BPI spatial distribution plots for these regions.

The BPI describes the likelihood that dead or debilitated sea turtles floating at the sea surface will be deposited on shore based on prevailing wind and currents. BPI is an indicator of favorable beaching conditions, that is, if there are drifting carcasses, they will be more likely to beach if BPI is high. This relationship between strandings and environmental conditions is relevant to understanding causes of stranding as well as the degree to which at-sea mortality may be represented by animals found on shore. The BPI applies velocity and direction of surface currents and wind from the American Seas Ocean Model (AMSEAS) of the Regional Navy Coastal Ocean Model (NCOM) to predict and describe the probability that floating turtles will be brought into shore. Within the BPI simulation, surface currents and winds from AMSEAS were used to push particles for an 8 day period based on lab and field studies of decomposition and persistence of sea turtle carcasses in the environment. Each day, at 0 h GMT, new particles were seeded onto a starting grid of 84,044 points spaced 1 nautical mile apart. This uniform grid extended from the coast to 60 nautical miles offshore, which is the furthest distance sea turtle carcasses were likely to drift based on observations. The system maintained a running tally such that on any given day all objects that are still in motion and less than 8 days old were pushed forward. Particles that encountered shallow water (<25 cm depth) stopped moving and were counted as "beached". The leeway value, the amount of "push" the wind gives a floating object was set to 3.5%, a value applicable to sea turtles or any other floating object which has about 50% of its area exposed above the sea surface.

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

Dates

Metadata Date 2023-03-15T01:02:08Z
Metadata Created Date March 17, 2023
Metadata Updated Date November 1, 2023
Reference Date(s) November 18, 2022 (publication), January 2, 2023 (revision)
Frequency Of Update asNeeded

Metadata Source

Harvested from NOAA/NESDIS/ncei/accessions

Graphic Preview

Preview graphic

Additional Metadata

Resource Type Series
Metadata Date 2023-03-15T01:02:08Z
Metadata Created Date March 17, 2023
Metadata Updated Date November 1, 2023
Reference Date(s) November 18, 2022 (publication), January 2, 2023 (revision)
Responsible Party (Point of Contact)
Contact Email
Guid gov.noaa.nodc:NCEI-Sea-Turtle-GOM-BPI
Access Constraints Cite as: Wang, Zhankun; Nero, Redwood W.; Cook, Melissa; Lau, Yee H.; Larsen, Kirsten; Sallis, David; NOAA National Centers for Environmental Information; NOAA Fisheries Sea Turtle Stranding and Salvage Network (2022). Sea Turtle Beaching Probability Index (BPI) in the Northern Gulf of Mexico dataset from 2017-01-01 to present. [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/NCEI-Sea-Turtle-GOM-BPI. Accessed [date]., 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.
Bbox East Long -81.0
Bbox North Lat 31.0
Bbox South Lat 25.0
Bbox West Long -98.0
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description Preview graphic
Graphic Preview File https://www.ncei.noaa.gov/access/metadata/landing-page/bin/gfx?id=gov.noaa.nodc:NCEI-Sea-Turtle-GOM-BPI
Graphic Preview Type PNG
Harvest Object Id 1397c13c-cac7-4e79-b9c0-10246ab034e3
Harvest Source Id c084a438-6f6b-470d-93e0-16aeddb9f513
Harvest Source Title NOAA/NESDIS/ncei/accessions
Licence accessLevel: Public
Lineage
Metadata Language eng
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-98.0, 25.0], [-81.0, 25.0], [-81.0, 31.0], [-98.0, 31.0], [-98.0, 25.0]]]}
Progress onGoing
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2017-01-01

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