Recent sea-level height data from the Jason-1 altimetric satellite show
that continuing weaker-than-normal trade winds in the western and central
equatorial Pacific have triggered another strong, eastward moving, warm
Kelvin wave. In the eastern equatorial Pacific, this "warm wave" appears
as the large area of higher-than-normal sea surface heights
(warmer-than-normal sea surface temperatures) between 140 degrees W
and 110 degrees W. A series of these types of events that began in August
2006 have contributed to the present El Niño condition.
“In the American west where we are struggling under drought conditions, we
welcome this modest, potentially rain-delivering El Niño,” said JPL
oceanographer Dr. Bill Patzert.
"The Jason-1 measurements are being used by several teams of international
scientists to study the physics of El Niño to improve our ability to predict future
events," said Dr. Lee-Lueng Fu, JPL Jason-1 project scientist.
This image was created with data collected by the U.S./French satellite during
a 10-day period centered on November 20, 2007. It shows a red area in the
eastern equatorial Pacific that is about 10 centimeters (4 inches) above normal.
These regions contrast with the western equatorial Pacific, where
lower-than-normal sea levels (blue areas) continue that are between 5 and 13
centimeters (2 and 5 inches) below normal. Along the equator, the red sea
surface heights equate to sea surface temperature departures greater than one
to two degrees Celsius (two to four degrees Fahrenheit).
This Jason-1 image shows sea surface height anomalies with the seasonal cycle
(the effects of summer, fall, winter, and spring) and trend removed. The differences
between what we see and what is normal for different times and regions are called
anomalies, or residuals. When oceanographers and climatologists view these
"anomalies" they can identify unusual patterns and can tell us how heat is being
stored in the ocean to influence future planetary climate events.
The U.S. portion of the Jason-1 mission is managed by JPL for NASA's Science
Mission Directorate, Washington, D.C. Research on Earth's oceans using Jason-1
and other space-based capabilities is conducted by NASA's Science Mission
Directorate to better understand and protect our home planet.
For more information on NASA's ocean surface topography missions, see
http://sealevel.jpl.nasa.gov/ or to view the latest Jason data see
http://sealevel.jpl.nasa.gov/science/jason1-quick-look/.
