Daily Global 5km Satellite Coral Bleaching Heat Stress Monitoring
(Version 3.1, released August 1, 2018)

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

Current Regional Images
Alert Area (7-day max):  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
Hotspot:  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
DHW:  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST:  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST Anomaly:  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
SST Trend (over 7 days):  45 | Global | East | West | Pac | Ind | S.Atl | Coral Triangle [big] | Caribbean [big] | Florida | Hawaii | GBR
   
4-Month Outlook (60%) 45 | 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, & others available since 25 Mar, 31 Mar, & 1 Jan 1985, respectively, and until 31 Dec 2017)

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)
Data Access via Data Servers at PacIOOS#:
                 THREDDS Data Server    |    ERDDAP

+ CDAT software to view CRW NetCDF data files.
* BAA: Bleaching Alert Area; DHW: Degree Heating Week; SSTA: SST Anomaly; SST: Sea Surface Temperature.
# PacIOOS: Pacific Islands Ocean Observing System.


  



Climatology**: NetCDF4 file   |   Pixel Images   |     (CDAT software - view NetCDF data files)
** Contains 12 monthly mean SST climatologies for deriving the SST Anomaly product, and the Maximum Monthly Mean (MMM) SST Climatology for deriving NOAA CRW's coral bleaching heat stress products.




 

Product Suite Description

The NOAA Coral Reef Watch (CRW) experimental daily global 5km (0.05 degree exactly) satellite coral bleaching heat stress monitoring product suite presented here is Version 3.1. It spans January 1, 1985 to present and is based on CRW's CoralTemp Version 1.0, a satellite-based daily global 5km sea surface temperature analysis dataset. This Version 3.1 5km product suite was developed based on user requests and to address errors identified in the source SST data for CRW's Version 3.0 products for some coral reef regions during 2013-2016. It now comprises the core of CRW's Decision Support System (DSS) for coral reef management, providing service at or near reef-scales, allowing direct monitoring of 95% of global coral reefs and significantly reducing data gaps caused by cloud cover.

Current CRW near real-time 5km global 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 offers 5km Regional Virtual Stations/Bleaching Heat Stress Gauges and a free, automated 5km Bleaching Alert Email System that are based on the global products presented here.

Note that SST variability is often considerably higher at the much finer 5km spatial and daily temporal resolutions, when compared with CRW's heritage operational twice-weekly 50km (0.5-degree) monitoring product suite. 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 accumulated heat stress impacts. 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 3.1. (Evolution of CRW's daily global 5km product suites can be found here.) This 7-day composite product shows the maximum stress level that a satellite pixel has experienced during the most recent seven (7) consecutive days. Data and images are dated on the last day of the 7-day period. Notably, it is compatible with CRW's operational 50km twice-weekly Bleaching Alert Area product, as the 50km Bleaching Alert Area is 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).

For the 5km 7-day SST Trend product, which is updated daily, CRW provides information on the pace and direction of the SST variation and thus coral bleaching heat stress, if present, over the past seven days. Introduced in CRW's Version 2 product suite and maintained here in Version 3.1, the composite SST Trend product includes seven daily global SSTs in its 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 3.1 5km products presented here (excluding the monthly and annual composites) are single-day products, which are updated daily. Normally, processing of the current day's products, which occurs midday U.S. Eastern Time, produces the data for yesterday's date. For example, data processed on a Wednesday afternoon will include all observations made on Tuesday (independent of time zone) and will produce images that carry Tuesday's date.


More detail on CRW's 5km product algorithm can be found in Liu et al. 2014.


CRW developed the Version 3.1 5km product suite with funding support from the NOAA Coral Reef Conservation Program. The first phase of the product release was completed April 11, 2018, with products spanning 1985-2017; the release was completed August 1, 2018, with the addition of 2018-present data.

 



CRW Operational Twice-weekly 50km Product Suite

CRW's first-generation (heritage) product suite -- the aforementioned operational twice-weekly 50km (0.5-degree exactly) monitoring product suite -- has provided 20+ years of successful satellite-based monitoring of coral reef ecosystem environmental conditions to global reef communities since 1997. CRW will continue to produce the 50km products until the 5km suite becomes operational. There are some differences between the two product suites in certain areas of the globe, and user discretion is advised. We have found the 5km product suite is more accurate due to our use of a next-generation, higher quality SST analysis; a next-generation SST algorithm based on multiple satellites/sensors; and an improved climatology.