[Coral-List] NOAA CRW Coral Bleaching Analysis and Outlook Message (Sept 2010)
Coral Reef Watch
coralreefwatch at noaa.gov
Fri Sep 10 13:38:55 EDT 2010
Analysis of September 2010 Thermal Stress and Seasonal Guidance Through
December 2010
SUMMARY:
The NOAA Coral Reef Watch (CRW) satellite coral bleaching monitoring
shows sea surface temperatures (SSTs) continue to remain above average
throughout the wider Caribbean region. Large areas of the southeastern
Caribbean Sea are experiencing thermal stress capable of causing coral
bleaching. The western Gulf of Mexico and the southern portion of the
Bahamas have also experienced significant bleaching thermal stress. The
CRW Coral Bleaching Thermal Stress Outlook indicates that the high
stress should continue to develop in the southern and southeast
Caribbean until mid-October. Bleaching stress in the western Gulf of
Mexico and southern Bahamas should dissipate quickly in the next couple
of weeks.
According to the CRW HotSpots, there is currently bleaching-level
thermal stress around a large region in the northwestern Pacific, but
except for the eastern coast of Japan, the high-stress areas are outside
of areas where corals occur. The high thermal stress previously centered
on the Philippines has mostly dissipated. Some areas around the
Northwestern Hawaiian Islands, the Philippines, and Palau continue in a
Bleaching Watch status. The outlook shows that the thermal stress in the
northwestern Pacific is expected to shift south starting in October as
the northern hemisphere summer ends. There is a potential for
bleaching-level stress through November in a region centered to the
south of Guam and extending from Palau to Chuuk. We will continue to
watch the potential for thermal stress around Papua-New Guinea later in
the year.
Most of the southern hemisphere and the entire Indian Ocean basin are
expected to remain free from significant bleaching thermal stress
through December 2010.
(See full alert message for details at
http://coralreefwatch.noaa.gov/satellite/bleachingoutlook/outlook_messages/bleachingoutlook_20100907_for_2010sepdec.html)
(Watch the recording of Reef Resilience Webinar: Bleaching Outlook for
September through December 2010, with Dr. Mark Eakin of the NOAA Coral
Reef Watch Program at
http://coralreefwatch.noaa.gov/satellite/bleachingoutlook/outlook_messages/bleachingoutlook_20100907_for_2010sepdec.html#webinar)
******************************************************************
Analysis and Outlook for Caribbean, Gulf of Mexico and Bahamas
--------------------
Current conditions:
The CRW satellite monitoring shows that thermal stress levels capable of
causing belaching have continued to develop in the southeastern
Caribbean since July, bearing a similar signature to the thermal stress
observed at the same time period in 2005, the year of a record mass
coral bleaching event. The highest thermal stress currently spans the
entire Lesser Antilles, from Montserrat to Tobago. Lower levels of
stress extend westward across the northern coast of Venezuela, and high
stress is also found on the Caribbean coast of Panama and Costa Rica.
The bleaching stresses in the western Gulf of Mexico and southern
Bahamas are still lingering. Earlier stress in Florida, northern
Bahamas, and the Greater Antilles has eased, partly due to recent
tropical weather. Hurricane Earl left a clear track of cooler water
north of the region including reports of cool water at depth in the US
Virgin Islands, and other weather disturbances have cooled temperatures
from Texas to the Virgin Islands. Mixing and cooling from a hurricane
can reduce thermal stress to a reef and prevent severe bleaching
(Manzello et al., 2007). Bleaching has been reported in Tobago to the
south and mild bleaching in the US Virgin Islands to the north.
--------------------
Bleaching outlook:
The CRW Coral Bleaching Thermal Stress Outlook continues to indicate a
high potential for thermal stress capable of causing significant coral
bleaching in the southern Caribbean in 2010. The region at greatest risk
fills the region east from Nicaragua past the island of Hispaniola to
Puerto Rico and the Lesser Antilles, and south along the Caribbean
coasts of Panama and South America. The intensity of the potential
thermal stress is predicted to increase through October. The Caribbean
typically experiences elevated temperature during the second year of an
El Niño event, with the 2009-2010 El Niño ending in May 2010. The region
described here as having the highest potential to experience
bleaching-levels of thermal stress is the same region that has been
anomalously warm throughout 2010. The model is only slightly
over-predicting the strength of the current thermal stress, adding to
our confidence that this may be a severe bleaching event.
The lingering bleaching stress in the western Gulf of Mexico and
southern Bahamas is expected to dissipate quickly in the next couple of
weeks.
*******************************************************************
Analysis and Outlook for western Pacific:
---------------------
Current conditions:
The thermal stress that caused bleaching in Southeast Asia and the
Philippines has abated, but temperatures across much of the western
tropical Pacific remain above normal at the moment. Some thermal stress
has accumulated in the Northwestern Hawaiian Islands, and temperatures
remain near the bleaching threshold in that region.
---------------------
As the summer comes to an end in the northern hemisphere, our outlook
shows that the thermal stress in the northwestern Pacific is expected to
shift south starting in October. The outlook indicates that there is a
potential for thermal stress capable of causing bleaching through
November in the region south from the Northern Mariana Islands and Guam
to the Federated States of Micronesia (FSM), extending from Palau to
Chuuk. This may move to include the northern coast of Papua-New Guinea
in December. However, unlike conditions in the Caribbean, most of this
western Pacific region has not yet warmed to bleaching levels. The model
is over-predicting warming at this time, leading to a hope that
bleaching will not be severe.
*******************************************************************
[Note: The Coral Reef Watch Bleaching Outlook is an experimental product
and should be used as an indicator of potential general patterns rather
than a precise predictor of thermal stress at any location. Actual
conditions may vary due to model uncertainty, subsequent changes in
climatic conditions, extreme localized variability, or weather patterns.]
*******************************************************************
Current HotSpot and Degree Heating Week charts and data formatted for
HDF and Google Earth can be found at:
http://coralreefwatch.noaa.gov/satellite/index.html
Time series graphics for index sites can be found at:
http://coralreefwatch.noaa.gov/satellite/current/sst_series_24reefs.html
and
http://coralreefwatch.noaa.gov/satellite/current/experimental_products.html
You can sign up for automated bleaching alerts at:
http://coralreefwatch-satops.noaa.gov/SBA.html
Please report bleaching events (or non-events) at:
http://www.reefbase.org/contribute/bleachingreport.aspx
============================
NOAA Coral Reef Watch
coralreefwatch at noaa.gov
============================
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