PDS logoPlanetary Data System
PDS Information
Find a Node - Use these links to navigate to any of the 8 publicly accessible PDS Nodes.

This bar indicates that you are within the PDS enterprise which includes 6 science discipline nodes and 2 support nodes which are overseen by the Project Management Office at NASA's Goddard Space Flight Center (GSFC). Each node is led by an expert in the subject discipline, supported by an advisory group of other practitioners of that discipline, and subject to selection and approval under a regular NASA Research Announcement.
Click here to return to the Photojournal Home Page Click here to view a list of Photojournal Image Galleries Photojournal_inner_header
Latest Images  |  Spacecraft & Technology  |  Animations  |  Space Images App  |  Feedback  |  Photojournal Search  

PIA03665: She's Back? La Niña Developing?
 Target Name:  Earth
 Is a satellite of:  Sol (our sun)
 Mission:  Jason-1 
 Spacecraft:  Jason-1 (TOPEX/Poseidon)
 Instrument:  Altimeter 
 Product Size:  900 x 900 pixels (w x h)
 Produced By:  JPL
 Full-Res TIFF:  PIA03665.tif (2.433 MB)
 Full-Res JPEG:  PIA03665.jpg (116.8 kB)

Click on the image above to download a moderately sized image in JPEG format (possibly reduced in size from original)

Original Caption Released with Image:

The tropical Pacific Ocean is beginning to exhibit the characteristics of a developing La Niña condition. This image shows that the gradual cooling of the central equatorial Pacific over the past few months is continuing and the area of low sea level (shown in blue) has decreased (cooled) slightly over last few months. It is still uncertain, scientists say, that this cold pool will evolve into a long-lasting, strong La Niña situation. For a complete discussion of this evolving situation and potential implications see: http://www.noaanews.noaa.gov/stories2006/s2559.htm.

This image of the Pacific Ocean was produced using sea-surface height measurements taken by the U.S.-French Jason satellite. The image shows sea surface height relative to normal ocean conditions on December 31, 2005; these sea surface heights are an indicator of the changing amount of heat stored in the ocean.

The purple areas in this image are about 18 centimeters (7 inches) below normal, creating a deficit in the heat supply to the surface waters. The white areas show the sea surface is between 14 and 32 centimeters (6 to 13 inches) above normal; in the red areas, it's about 10 centimeters (4 inches) above normal. The green areas indicate normal conditions.

A La Niña situation is essentially the opposite of an El Niño condition. During La Niña, the trade winds are stronger than normal and the cold water that normally exists along the coast of South America extends to the central equatorial Pacific. A La Niña reappears every three to five years and, if the present event strengthens, it will certainly reorganize global weather patterns.

The U.S. portion of the Jason mission is managed by JPL for NASA's Science Mission Directorate, Washington, D.C. Research on Earth's oceans using Jason and other space-based capabilities is conducted by NASA's Science Mission Directorate to better understand and protect our home planet.

Image Credit:
NASA/JPL Ocean Surface Topography Team

Image Addition Date:
2006-01-13