Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback

    • NOAA Coral Reef Watch Operational Daily Near-Real-Time Global 5-km Satellite Coral Bleaching Monitoring Products

    Metadata Updated: June 10, 2023

    Contains a suite of NOAA Coral Reef Watch (CRW) version 3.1 operational global satellite coral bleaching heat stress monitoring products at 5-km resolution produced daily in near real-time, including sea surface temperature (SST), SST anomaly, HotSpot, Degree Heating Week (DHW), and Bleaching Alert Area (BAA). These data are based on CoralTemp Version 1.0, a daily global 5-km sea surface temperature dataset combined from: (1.) NOAA/NESDIS operational near-real-time daily global 5-km geostationary-polar-orbiting (geo-polar) blended night-only SST analysis, (2.) NOAA/NESDIS 2002-2016 reprocessed daily global 5-km geo-polar blended night-only SST analysis, and (3.) United Kingdom Met Office 1985-2002 daily global 5-km night-only SST reanalysis of Operational SST and Sea Ice Analysis (OSTIA). The SST anomaly is the difference of SST compared to daily SST climatology. The coral bleaching HotSpot is a special type of sea surface temperature (SST) anomaly and shows the difference of SST compared to a coral bleaching SST threshold climatology. DHW is the accumulation of Coral Bleaching HotSpots over a period of 12 consecutive weeks. The DHW value at any particular location at any particular time is the summation of the product of HotSpot values which are at least 1 deg C above the bleaching threshold SST and their durations in weeks over the most recent 12-week period. One DHW is equivalent to 1 week of SST at 1 deg C above the threshold or 0.5 week of SST at 2 deg C above the threshold, etc. The units for DHW are deg C-weeks, combining the intensity and duration of heat stress into one single number. Based on research at Coral Reef Watch, when the heat stress reaches 4 deg C-weeks, you can expect to see significant coral bleaching, especially in more sensitive species. When heat stress is 8 deg C-weeks or higher, you would likely see widespread bleaching and mortality from the heat stress.

    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 September 4, 2022
    Metadata Created Date August 27, 2021
    Metadata Updated Date June 10, 2023
    Reference Date(s) May 19, 2017 (creation), May 19, 2017 (issued)
    Frequency Of Update

    Metadata Source

    Harvested from Pacific Fisheries Environmental Laboratory

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Date September 4, 2022
    Metadata Created Date August 27, 2021
    Metadata Updated Date June 10, 2023
    Reference Date(s) May 19, 2017 (creation), May 19, 2017 (issued)
    Responsible Party NOAA Coral Reef Watch (CRW) (Point of Contact)
    Contact Email
    Guid NOAA_DHW
    Access Constraints
    Bbox East Long 179.975
    Bbox North Lat 89.975
    Bbox South Lat -89.975
    Bbox West Long -179.975
    Coupled Resource [{"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}, {"title": [], "href": ["#DataIdentification"], "uuid": []}]
    Frequency Of Update
    Harvest Object Id f7263284-8bbf-409c-a0f2-62e025000757
    Harvest Source Id 817069b7-5f4e-4664-9e6b-615af3dfcf2d
    Harvest Source Title Pacific Fisheries Environmental Laboratory
    Licence
    Lineage 2017-05-19T00:00:00Z Data obtained from NOAA Coral Reef Watch and re-distributed via THREDDS Data Server (TDS) at PacIOOS to provide temporal aggregation and distribution through NetCDF/OPeNDAP utilities like ncWMS and ERDDAP. 2018-11-26T00:00:00Z Upgraded dataset from v3.0 to v3.1, which also extends start date from 2013-06-03 back to 1985-04-01. 2020-06-04T00:00:00Z Although still v3.1, CRW implemented some changes to metadata and ice masks for transition to NOAA/NESDIS operational products.
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-179.975, -89.975], [179.975, -89.975], [179.975, 89.975], [-179.975, 89.975], [-179.975, -89.975]]]}
    Progress
    Spatial Data Service Type ERDDAP griddap
    Spatial Reference System
    Spatial Harvester True
    Temporal Extent Begin 1985-04-01T12:00:00Z
    Temporal Extent End 2022-09-02T12:00:00Z

    Didn't find what you're looking for? Suggest a dataset here.