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Latest Josh Willis Stories

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2011-08-24 12:22:44

  An Update from NASA's Sea Level Sentinels: Like mercury in a thermometer, ocean waters expand as they warm. This, along with melting glaciers and ice sheets in Greenland and Antarctica, drives sea levels higher over the long term. For the past 18 years, the U.S./French Jason-1, Jason-2 and Topex/Poseidon spacecraft have been monitoring the gradual rise of the world's ocean in response to global warming. While the rise of the global ocean has been remarkably steady for most of...

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2010-03-26 06:20:52

New NASA measurements of the Atlantic Meridional Overturning Circulation, part of the global ocean conveyor belt that helps regulate climate around the North Atlantic, show no significant slowing over the past 15 years. The data suggest the circulation may have even sped up slightly in the recent past. The findings are the result of a new monitoring technique, developed by oceanographer Josh Willis of NASA's Jet Propulsion Laboratory in Pasadena, Calif., using measurements from...

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2010-02-23 14:42:48

Climatologists have long known that human-produced greenhouse gases have been the dominant drivers of Earth's observed warming since the start of the Industrial Revolution. But other factors also affect our planet's temperature. Of these, the ocean plays a dominant role. Its effects helped nudge global temperatures slightly higher in 2009, and, according to NASA scientists, could well contribute to making 2010 the warmest year on record. Covering 71 percent of our planet's surface, the ocean...

2006-09-21 15:17:58

The average temperature of the water near the top of the Earth's oceans has significantly cooled since 2003. New research suggests global warming trends are not always steady in their effects on ocean temperatures. Although the average temperature of the upper oceans has significantly cooled since 2003, the decline is a fraction of the total ocean warming over the previous 48 years. "This research suggests global warming isn't always steady, but happens with occasional 'speed bumps'," said...

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2006-06-16 09:15:00

Sea level isn't, well, level. Nor is the rate by which sea level has been rising over the past few decades, but the trend is clearly up. Global sea level has risen an average of three millimeters (.1 inch) per year since 1993. Rising seas have the potential to affect billions of people around the globe, not just those living near coastlines. With the ocean soaking up more heat from a warming planet and glaciers melting at a record-breaking pace, is there any way to know where and when sea...

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2005-07-25 09:44:08

NASA -- "It's a match!" For detectives in a crime story, identical fingerprints or cloth fibers might solve the case. For scientists, it could be something equally dramatic. It might be real-life observations that match the simulations of their computer models. Such a match would provide evidence that they understand enough about a complex system to be able to understand its past behavior and perhaps anticipate its future behavior. For researchers studying climate change, the proof they've...


Word of the Day
cacodemon
  • An evil spirit; a devil.
  • A nightmare.
  • In astrology, the twelfth house of a scheme or figure of the heavens: so called from its signifying dreadful things, such as secret enemies, great losses, imprisonment, etc.
'Cacodemon' comes from a Greek term meaning 'evil genius.'
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