The next time you have to raise your umbrella against torrents of cold winter rain, you may have a remote weather phenomenon to thank that many may know by name as El Niņo, but may not well understand. Researchers now believe that some of the most intense winter storm activity over parts of the United States may be set in motion from changes in the surface waters of far-flung parts of the Pacific Ocean. Siegfried Schubert of NASA's Goddard Space Flight Center in Greenbelt, Md., and his colleagues studied the impact that El Niņo-Southern Oscillation (ENSO) events have on the most intense U.S. winter storms.
A warming global ocean - influencing the winds that shear off the tops of developing storms - could mean fewer Atlantic hurricanes striking the United States according to new findings by NOAA climate scientists. Furthermore, the relative warming role of the Pacific, Indian and Atlantic oceans is important for determining Atlantic hurricane activity.
After enduring months on the coldest, driest and windiest continent on Earth, researchers today closed out the inaugural season on an unprecedented, multi-year effort to retrieve the most detailed record of greenhouse gases in Earth's atmosphere over the last 100,000 years. Working as part of the National Science Foundation's West Antarctic Ice Sheet Divide (WAIS Divide) Ice Core Project, a team of scientists, engineers, technicians and students from multiple U.S. institutions have recovered a 580-meter (1,900-foot) ice core--the first section of what is hoped to be a 3,465-meter (11,360-foot) column of ice detailing 100,000 years of Earth's climate history, including a precise year-by-year record of the last 40,000 years.
The first evidence of a volcanic eruption from beneath Antarctica's
most rapidly changing ice sheet is reported this week in the journal
Nature Geosciences. The volcano on the West Antarctic Ice Sheet
erupted 2000 years ago (325BC) and remains active.
A wave of new NASA research on tsunamis has yielded an innovative
method to improve existing tsunami warning systems, and a potentially
groundbreaking new theory on the source of the December 2004 Indian
Ocean tsunami. In one study, published last fall in Geophysical
Research Letters, researcher Y. Tony Song of NASA's Jet Propulsion
Laboratory, Pasadena, Calif., demonstrated that real-time data from NASA's network of global positioning system (GPS) stations can detect
ground motions preceding tsunamis and reliably estimate a tsunami's
destructive potential within minutes, well before it reaches coastal
areas. The method could lead to development of more reliable global
tsunami warning systems, saving lives and reducing false alarms.
Climatologists at the NASA Goddard Institute for Space Studies (GISS)
in New York City have found that 2007 tied with 1998 for Earth's
second warmest year in a century. Goddard Institute researchers used
temperature data from weather stations on land, satellite
measurements of sea ice temperature since 1982 and data from ships
for earlier years.
Zigzagging some 60,000 kilometers across the ocean floor, Earth's
system of mid-ocean ridges plays a pivotal role in many workings of
the planet: in plate-tectonic movements, heat flow from the interior,
and the chemistry of rock, water and air. Now, a team of
seismologists working in 2,500 meters of water on the East Pacific
Rise, some 565 miles southwest of Acapulco, Mexico, has made the
first images of one of these systems--and it doesn't look the way
most scientists had assumed.
A Duke University-led analysis of available records shows that while
the North Atlantic Ocean's surface waters warmed in the 50 years
between 1950 and 2000, the change was not uniform. In fact, the
subpolar regions cooled at the same time that subtropical and
tropical waters warmed.
Plate tectonics, the geologic process responsible for creating the
Earth's continents, mountain ranges, and ocean basins, may be an
on-again, off-again affair. Scientists have assumed that the shifting
of crustal plates has been slow but continuous over most of the
Earth's history, but a new study from researchers at the Carnegie
Institution suggests that plate tectonics may have ground to a halt
at least once in our planet's history-and may do so again.
2008 is set to be cooler globally than recent years say Met Office
and University of East Anglia climate scientists, but is still
forecast to be one of the top-ten warmest years. Each January the Met
Office, in conjunction with the University of East Anglia, issues a
forecast of the global surface temperature for the coming year. The
forecast takes into account known contributing factors, such as El
Niño and La Niña, increasing greenhouse gas concentrations, the
cooling influences of industrial aerosol particles, solar effects and
natural variations of the oceans.
Using a novel device that simulates earthquakes in a laboratory setting, a Los Alamos researcher and his colleagues have shown that seismic waves - the sounds radiated from earthquakes - can induce earthquake aftershocks, often long after a quake has subsided. The research provides insight into how earthquakes may be triggered and how they recur.
The U.S. Climate Change Science Program Revised Research Plan Summary
is available in the Federal Register and online for review and
comment by the public. Comments received by February 26, 2008, will
be considered during the preparation of the final revised research
plan and the forthcoming scientific assessment.
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