Daily 5km Satellite Coral Bleaching Heat Stress Monitoring
(New Version 3, released on 4 May 2017, experimental product)

Click on buttons below image to change parameter; click on image to view larger, tiled images.

Current Regional Images
Alert Area (7-day max):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
Hotspot:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
DHW:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST Anomaly:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST Trend (over 7 days):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
   
4-Month Outlook (60%) 45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR


Most Recent 30-day Animations
Alert Area (7-day max):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
Hotspot:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
DHW:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST Anomaly:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST Trend (over 7 days):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR

Most Recent 90-day Animations
Alert Area (7-day max):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
Hotspot:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
DHW:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST Anomaly:  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR
SST Trend (over 7 days):  45ns | Global | East | West | Pac | Ind | S.Atl | Coral Triangle | Caribbean | Florida | Hawaii | GBR

Archived Data and Images
(Degree Heating Week, Alert Area, and others available since 3 June, 9 June, and 12 March 2013, respectively)

Global and Regional Images:
60x40-degree tiled images (small, 720x540) (see description of tiles)
60x40-degree tiled images (large, 2160x1620) (see description of tiles)


Data Access via FTP Server:
NetCDF4 Data+   BAA* (7-d max) | BAA (single-day) | HotSpot | DHW | SSTA* | SST | SST Trend (7-day)
Images (pixels)   BAA* (7-d max) | BAA (single-day) | HotSpot | DHW | SSTA* | SST | SST Trend (7-day)
Images (browse)   BAA* (7-d max) | BAA (single-day) | HotSpot | DHW | SSTA* | SST | SST Trend (7-day)

+ CDAT software for viewing CRW netCDF data files.
* BAA: Bleaching Alert Area; SSTA: SST Anomaly.


  




 

Product Suite Description

The NOAA Coral Reef Watch (CRW) experimental daily global 5km (0.05 degree) satellite coral bleaching heat stress monitoring product suite presented here is the third version (Version 3). The 5km suite is based on the NOAA/NESDIS operational daily global 5km geostationary-polar-orbiting (Geo-Polar) Blended Night-only SST Analysis. Current CRW 5km products include sea surface temperature (SST), SST Anomaly, Coral Bleaching HotSpot, Degree Heating Week (DHW), a 7-day maximum Bleaching Alert Area, and a 7-day SST Trend. CRW also has a 5km Regional Virtual Stations/Bleaching Heat Stress Gauges product and a free, automated 5km Bleaching Alert Email System that are based on this product suite.

A significantly improved climatology was introduced in the Version 3 products. The new climatology was derived from a combination of NOAA/NESDIS' 2002-2015 reprocessed daily global 5km Geo-Polar Blended Night-only SST Analysis, and the 1985-2007 daily global 5km SST reanalysis, produced by the United Kingdom Met Office, on the Operational SST and Sea Ice Analysis (OSTIA) system. The near-real-time OSTIA SST was recently incorporated into the generation of NESDIS' operational daily 5km Blended SST that CRW's 5km coral bleaching heat stress monitoring product suite is based on. Hence, the 2002-2015 reprocessed 5km Geo-Polar Blended SST that has just become available, extended with the 1985-2002 portion of the 5km OSTIA SST reanalysis, is the best historical global SST dataset for deriving a climatology that is internally consistent and compatible with CRW's near-real-time 5km satellite coral bleaching heat stress monitoring products.

Note that the climatology used for CRW's Version 2 5km bleaching heat stress monitoring products was produced using night-only values for the 28-year period, 1985-2012, from the 4km Advanced Very High Resolution Radiometer (AVHRR) Pathfinder Version 5.2 SST (PFV5.2) dataset, an official NOAA climate data record. At the time the Version 2 product suite was developed, PFV5.2 was the highest quality historical daily global SST available, with a spatial resolution (4km) close to the desired 5km resolution. However, the gappy daily PSFV.2 SST introduced warm bias in the resulting climatology, causing an underestimation of coral bleaching heat stress in many coral reef regions worldwide. (Evolution of CRW's next-generation daily global 5km product suites, including a more detailed description of the Version 2, can be found here.)

This daily global 5km coral bleaching heat stress monitoring product suite provides service at or near reef-scales, allowing direct monitoring of 95% of global coral reefs and significantly reducing data gaps caused by cloud cover. The 5km products now comprise the core of CRW's next-generation Decision Support System (DSS) for coral bleaching management. After further testing and evaluation, CRW's heritage operational 50km product suite, which has provided 20 years of successful satellite-based monitoring of coral reef ecosystem environmental conditions to global reef communities, will be retired.

SST variability is often considerably higher at the much finer 5km spatial and daily temporal resolutions, when compared with CRW's 50km twice-weekly SST. Due to resulting day-to-day fluctuations between stress levels in highly-variable locations, the single-day 5km Bleaching Alert Area product does not consistently and adequately identify potentially harmful heat stress levels, especially with regard to the impact of accumulated heat stress. Rather than requiring users to examine the single-day 5km Bleaching Alert Area product over several days, a 7-day maximum Bleaching Alert Area composite product, updated daily, was introduced in the Version 2 product suite and is maintained here in Version 3. This 7-day composite product shows the maximum stress level that a satellite pixel has experienced during the most recent seven (7) consecutive days. The data and images are dated on the last day of the 7-day period. Additionally, the 5km 7-day maximum Bleaching Alert Area composite product is compatible with CRW's operational 50km twice-weekly Bleaching Alert Area product. (The 50km Bleaching Alert Area product is actually based on a half-week (3 or 4 days) composite of 50km SSTs, but with much less SST variability due to its much coarser spatial resolution.)

The daily 5km 7-day SST Trend provides information on the pace and direction of the SST variation, and thus coral bleaching heat stress, if present, over the past seven days. Seven daily global SSTs are included in the calculation. Pixels colored in green have insignificant trends, due either to small SST trends (within the range -0.2 to 0.2 °C) or trends that failed the two-tailed Student's-t test for the 20% significance level with five degrees of freedom.

All other Version 3 5km products presented here are single-day products, updated daily. Images will be 1-2 days behind the current date, however, as data are processed in the early afternoon, U.S. Eastern Time, using data from the previous day. For example, data processed on a Wednesday afternoon will include all observations made on Tuesday (independent of time zone) and will carry Tuesday's date.

This Version 3 suite was released on May 4, 2017, along with a new version of CRW's 5km Regional Virtual Stations/Bleaching Heat Stress Gauges product. Version 2 of the 5km product suite (that Version 3 replaces) was released on May 5, 2014, and Version 1 was released on July 5, 2012 (based on NESDIS' operational daily global 5km Geo-Polar Blended Day-Night SST Analysis and an earlier version of the climatology derived from the PFV5.2).


For additional technical details about the new 5-km product suite, see Liu et al. 2014.


Development of this next-generation 5km product suite was accomplished through a collaboration of NOAA Coral Reef Watch, the University of South Florida, NASA-Ames, the UNEP World Conservation Monitoring Centre, and the Cooperative Institute for Research in Environmental Science, with funding support from the NASA Biodiversity and Ecological Forecasting program, the NOAA Coral Reef Conservation Program, and the NOAA/NESDIS Ocean Remote Sensing Program. Production of the Version 3 suite was made possible through funding from the NOAA Coral Reef Conservation Program. The 5km product suite, which was featured in the NASA Applied Sciences Program's 2013 Annual Report, will undergo continuous improvements.

As noted above, CRW's first-generation (heritage) product suite is the operational twice-weekly 50km (0.5 degree) monitoring product suite. CRW will continue to produce the 50km products until the 5km suite becomes operational. There will be some differences between the two product suites in certain areas of the globe, and user discretion is advised. We expect the 5km product suite will be more accurate due to the improved data quality, density, spatial and temporal resolutions, and climatology. Note that improvements of the 5km products over the heritage 50km products are due to CRW's use of the next-generation, higher quality SST analysis, with a next-generation SST algorithm, based on multiple satellites/sensors.

 



CRW Operational Twice-weekly 50km Product Suite