NOAA Coral Reef Watch Daily 5km Satellite Coral Bleaching Heat Stress Monitoring Products (Version 3.1)

NOAA Coral Reef Watch Daily 5km Satellite Coral Bleaching Heat Stress Monitoring Products (Version 3.1)
NOAA Coral Reef Watch Program
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Daily Global 5km Satellite Coral Bleaching Heat Stress Monitoring
(Version 3.1, 1985-present, released August 1, 2018)
Click on buttons below image to change parameter; click on image to view larger, tiled images.
Virtual Stations/Gauges
Current Regional Images
Alert Area (7-day max):
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
DHW:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
HotSpot:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Anomaly:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Trend (over 7 days):
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
4-Month Outlook (60%)
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
Other NOAA Portals Serving CRW Data (Current Data and Interactive Map Servers)
External Partners Serving CRW Data (Current Data and Interactive Map Servers)
**Disclaimer: While NOAA Coral Reef Watch data are included in the above platforms as part of ongoing scientific collaboration, NOAA and Coral Reef Watch
do not endorse any of these platforms or other datasets contained within them.**
Most Recent 30-day Animations
Alert Area (7-day max):
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
DHW:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
HotSpot:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Anomaly:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Trend (over 7 days):
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
Most Recent 90-day Animations
Alert Area (7-day max):
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
DHW:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
HotSpot:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Anomaly:
Tropics
Global
East
West
Pac
Ind
S.Atl
Coral Triangle
Caribbean
Florida
Hawaii
GBR
SST Trend (over 7 days):
Tropics
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)
Sea Surface Temperature (
CoralTemp
) Images:
60x40-degree tiled images
(see
description
of tiles)
CoralTemp
-derived Coral Bleaching Heat Stress Product Images:
60x40-degree tiled images
(see
description
of tiles)
Data Access via HTTP 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 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 NOAA/NCEI Data Portal:
NetCDF4 Data
Click
here
to access the data portal and download data via HTTP, FTP, or THREDDS
Images (pixels)
Click
here
to access the data portal and download data via HTTP, FTP, or THREDDS
Images (browse)
Click
here
to access the data portal and download data via HTTP, FTP, or THREDDS
Data Access via Data Servers at PacIOOS
(time-series guide)
ERDDAP (data page)
ERDDAP (graph page)
THREDDS Data Server
Data Access via Data Servers at NOAA CoastWatch West Coast Regional Node:
(time-series guide)
ERDDAP (data page)
ERDDAP (graph page)
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:
HTTPS
FTP
Pixel Images:
HTTPS
FTP
** Click
here
for climatology description.
** Contains 12 monthly mean SST climatologies for deriving CRW's daily global 5km SST Anomaly product. The maximum pixel-based
values from among the 12 monthly mean SST climatologies form the Maximum Monthly Mean (MMM) SST climatology, which is then used to
derive CRW's daily global 5km coral bleaching heat stress products.
Product Metadata:
Web-format Metadata
XML Metadata
Plain Text Metadata
CDAT software:
A NOAA CoastWatch software package to view NetCDF data files.
Access it
here
Product Suite Description
The NOAA
Coral Reef Watch (CRW)
daily global
5km (0.05 degree exactly) satellite coral bleaching heat stress monitoring product suite
presented here is Version 3.1 (v3.1). It spans January 1, 1985 to present and is based on CRW's v3.1 daily
global 5km satellite sea surface temperature (SST) data product known as
CoralTemp
This v3.1 5km product suite was
developed based on user requests and to address errors identified in the source SST data for
CRW's v3.0 products for some coral reef regions during 2013-2016. It now comprises
the core of CRW's decision support system 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.
CRW's current v3.1 daily global 5km satellite products include: SST (a.k.a.
CoralTemp
), SST Anomaly, Coral Bleaching
HotSpot, coral bleaching Degree Heating Week (DHW), a single-day Bleaching Alert Area, a 7-day maximum Bleaching Alert Area,
and a 7-day SST Trend. CRW produces year-to-date (for the current year), monthly, and annual composites of the SST,
SST Anomaly, Coral Bleaching HotSpot, DHW, and Bleaching Alert Area products. We also provide the most
recent 30-day and 90-day animations of the SST, SST Anomaly, Coral Bleaching HotSpot, DHW, Bleaching Alert Area (7-day maximum),
and SST Trend products. In addition, we offer daily 5km
Regional Virtual
Stations/Bleaching Heat Stress Gauges
and a free, automated 5km
Satellite 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 twice-weekly global
50km (0.5-degree) monitoring products. 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 v2 product suite
and is maintained here in v3.1. (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 heritage twice-weekly global 50km
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 v2 product suite, and maintained here in
v3.1, 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 v3.1 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 information on the NOAA CRW 5km satellite product algorithm and v3.1 product updates can be found in
Liu
et al.
2014
and
Skirving
et al.
2020
, respectively.
Click
here
for CRW's methodology web page, detailing our v3.1 daily global 5km
products, climatologies, composites, animations, and data.
Click
here
for CRW's tutorial about coral reefs, coral bleaching, satellite
remote sensing of the marine environment, and our daily global and regional 5km satellite products.
CRW developed the v3.1 5km coral bleaching heat stress products 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 full release was completed August 1, 2018, with the addition of
2018-present data.
Evolution of CRW's daily global 5km product suites
CRW Twice-weekly Global 50km Product Suite
CRW's first-generation (heritage) near real-time
twice-weekly global 50km satellite coral bleaching
heat stress monitoring products
were operational at NOAA until April 30, 2020, when they were offically retired,
and succeeded by CRW's next-generation operational daily global 5km coral bleaching heat stress monitoring products (presented on this page).
The heritage 50km products served the U.S. and international coral reef communities for more than 20 years (1997-2020). While the 50km products
no longer update in near real-time, due to their retirement, since they served as vital tools for our users for so many years,
archived 50km data and images
are still available on the CRW website.
There are some differences between the 5km and 50km 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.
How to cite these products and methods
Disclaimer
Information Quality
Accessibility Policy
Customer Survey
Owner:
NOAA Coral Reef Watch