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Taking a Measure of Sea Level Rise: Ocean Altimetry
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Published November 5, 2020
The ocean is lumpy and sloshes around its basins for natural reasons. But it is also rising, slowly and steadily.
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Reservoir Swells Upstream of Mosul
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Published May 8, 2019
Satellite data shows that water levels in Iraq’s largest reservoir have reached heights not seen in more than a decade.
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Sea Level Rise is Accelerating
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Published February 20, 2018
The acceleration has been driven mainly by increased ice melting in Greenland and Antarctica, and it has the potential to double the total sea level rise projected by 2100.
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La Niña Makes a Quiet Return
Published December 22, 2017
Cooler than normal conditions prevail in the central and eastern Pacific, but the event is so far considered weak.
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Muted La Niña Follows Potent El Niño
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Published January 6, 2017
The near-record water temperatures of 2015-16 has been followed by a modest, quiet appearance of La Niña.
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The Decline of Lake Kariba
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Published February 12, 2016
Drought has struck a huge reservoir on the border Zambia and Zimbabwe, reducing the hydro power supply from Kariba dam .
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El Niño Should Be Near Its Peak
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Published January 22, 2016
Past events suggest the phenomenon winds down after December and January. But will this year follow the pattern?
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El Niño Strengthening
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Published October 13, 2015
With each passing month, 2015 looks more and more like 1997.
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El Niño Conditions Are Growing Stronger
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Published August 5, 2015
Weakening trade winds are allowing warm water to move east across the Pacific in a telltale pattern.
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Weak El Niño, but Hints of Pacific Change
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Published March 25, 2015
Ocean conditions are not likely to help drought-stressed regions this spring. However, some broader changes might be coming in the Pacific.
Is El Niño Developing?
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Published May 14, 2014
Conditions in May 2014 look similar to those in May 1997, a year that brought one of the most potent El Niño events of the 20th century.
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Pacific Waters Remain Stubbornly Stable
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Published September 12, 2013
Neutral, or La Nada, conditions persist in the equatorial Pacific Ocean, frustrating climate forecasters.
La Niña comes to a close
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Published May 4, 2012
After appearing for two consecutive winters, La Niña appears to be taking some time off.
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Strong La Niña in December 2010
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Published December 24, 2010
These images show that the central and eastern Pacific Ocean was unusually cold in December 2010, a tell-tale sign of La Niña. The associated rainfall map shows that La Niña was impacting weather in parts of the globe.
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Kelvin Wave Renews El Niño
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Published March 21, 2010
A trio of globes of sea surface height anomalies shows a deep pulse of warm water—a Kelvin wave—crossing the Pacific Ocean in February 2010. Kelvin waves strengthen and maintain El Niño episodes.
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El Nino Resurging in November 2009
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Published November 19, 2009
A wave of warm water pooling in the central and eastern Pacific appears as a large area of higher-than-normal sea surface heights in this image from early November.
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