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SeaWiFS
View of the Carolina Coast
Albemarle
and Pamlico Sound still look very dark in this SeaWiFS pass. All of the
organic matter washed in by this summer's hurricanes is absorbing most
of the incoming solar radiation.
08
December 1999
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El
Niņo's Dramatic Impact on Ocean Biology, Carbon Dioxide Captured By a
Unique Monitoring System
The
1997-98 El Niņo/La Niņa had an unprecedented roller-coaster effect on
the oceanic food chain across a vast swath of the Pacific, plunging chlorophyll
levels to the lowest ever recorded in December 1997 and spawning the largest
bloom of microscopic algae ever seen in the region the following summer.
According to new results published in the Dec. 10 issue of the journal
Science, El Niņo also dramatically reduced the amount of carbon dioxide
normally released into the atmosphere by the equatorial Pacific Ocean.
View
The Press Release
Images
The
Official Reproduction Guidelines for Use of NASA Images and Emblems
Credit line for all images: NASA/Goddard Space Flight Center The SeaWiFs
Project Science Visualization Studio
NOTE: All SeaWiFs images and data presented on this website are for research
and educational use only. All commercial use of SeaWiFs data must be coordinated
with ORBIMAGE.
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Artist
Concept of Terra Instruments Scanning the Earth
Terra
Spacecraft/Atlas IIAS Rocket Ready For Launch Dec. 16 -- The launch of
NASA's Terra spacecraft aboard a Lockheed Martin Atlas IIAS rocket is
scheduled to occur on Thursday, Dec. 16 from Space Launch Complex 3 East
at Vandenberg Air Force Base, Calif. The launch window is 25 minutes in
duration extending from 10:33 - 10:58 a.m. PST (1:33 - 1:58 p.m. EST).
(Details)
Terra
Spacecraft To Lead The Way (Details); Terra Website
07
December 1999
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NASA
Spacecraft Observes Lowest Ozone Ever in Northern Hemisphere
A
NASA spacecraft has observed the lowest value of ozone ever seen in the
Northern Hemisphere since spacecraft first began ozone measurements in
1978. The measurement was obtained on Nov. 30, 1999 using the Total Ozone
Mapping Spectrometer (TOMS) instrument aboard NASA's Earth Probe (TOMS-EP)
satellite. The measurement showed an extremely low level of 165 Dobson
Units (DU) over the North Sea between Scotland and Norway. The blue
color indicates lower than normal levels of ozone.
Scientists believe a combination of stratospheric and tropospheric weather
systems may be responsible for this extreme low ozone event. Scientists
and others have a keen interest in polar ozone depletion. While this particular
record low value results from a convergence of weather systems, severe
depletions of ozone can result from chemical processes. Chemically caused
Arctic ozone losses have also been observed, particularly in the Northern
Hemisphere springs of 1996 and 1997.
TOMS
ozone data and pictures are available on the Internet at: http://toms.gsfc.nasa.gov/
GSFC Press Release 99-127
02
December 1999
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Hurricane
Lenny as seen from SeaWiFS
14 November 1999
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NASA
Tests Design Concept For A New Pumpkin-Shaped Balloon
For
more information on NASA's Scientific Balloon Program visit NASA Wallops Flight Facility homepage or the
Balloon Program website
; (Details)
08
November 1999
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New
Global Digital Tectonic Activity Map Of The Earth Produced
NASA
scientists have developed a new digital tectonic activity map of the Earth
that pinpoints the geologically and volcanically active features of the
entire planet over the last one million years. (Details); Geodynamics Branch Homepage
05
November 1999
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Annual
Depletion Of Antarctic Ozone Results Are In: 'Ozone Hole'
Smaller Than Last Year A
NASA satellite has shown that the area of ozone depletion over
the Antarctic -- the well-known ozone "hole" -- is
a bit less in 1999 than it was last year. TOMS ozone data
and pictures are available at http://toms.gsfc.nasa.gov
or select Images or Antarctic Ozone for 7/99 to 10/99
QuickTime (160x120) (691KB). (Details)
05
October 1999
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NASA
Spacecraft Provides Direct Evidence - Smoke Inhibits Rainfall
Smoke
from forest fires has, for the first time, been proven to inhibit rainfall,
according to an extensive analysis of data taken from NASA's Tropical
Rainfall Measuring Mission (TRMM) spacecraft. (Details) (JPEG
Image); Information and images from the TRMM mission are available
at http://trmm.gsfc.nasa.gov/
05
October 1999
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Scientists
Look for Signs of Pollution in the Superhighway in the Sky
If
you think traffic is getting worse on your commute, you're not alone.
Hundreds of commercial airline flights carry thousands of passengers from
the U.S. to Europe each day-traveling along what has become the busiest
jet super highway in the world: the Atlantic corridor. Could all of that
air traffic exhaust be a detriment to the atmosphere at 35,000 feet the
way that auto exhaust pollutes the air we breathe?
In
a study to be released in the Oct. 15 issue of the journal Geophysical
Research Letters, NASA scientists found that the atmosphere over the Atlantic
acts nothing like the Los Angeles basin when it comes to collecting ozone-the
chemical responsible for smog. (Details)
Captions
(click on thumbnail for larger image):Specially designed chemical analyzer.
The instrument is highly sensitive and able to analyze minute amounts
of trace gases in the very clean atmosphere at 35 thousand feet. A probe
protrudes from the plane taking in air for analyses of organic acids and
nitric acid-a reaction product of nitrogen oxides that end up as acid
rain. Other nitrogen oxides create ozone. In this part of the atmosphere,
ozone acts as a heat-trapping greenhouse gas.
Contrails.
The long wispy clouds that trail jets can turn into cirrus clouds. Cirrus
clouds add heat to the lower atmosphere. Some scientists believe that
cirrus clouds formed by aircraft may add to global warming.
The
NASA DC-8 and the Deutschen Zentrum für Luft-und Raumfahrt (DLR), Germany's
national space agency, Falcon-20.
Anne
Thompson, Goddard Space Flight Center atmospheric scientist and mission
scientist for the Subsonic Assessment Ozone and Nitrogen Oxides Experiment
(SONEX), part of NASA's Atmospheric Affects of Aviation Experiment.
A
laser water vapor detector measures water vapor in the atmosphere between
the window of the plane and wing.
Tandem
testing. The NASA DC-8 flies in gas-sampling formation with a Deutschen
Zentrum für Luft-und Raumfahrt (DLR), Germany's national space agency,
Falcon-20. The DLR has been testing the affects of aircraft on the atmosphere
since the early 1990s.
Gas-collecting
inlet probes protrude from the DC-8
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Hot
Stuff from the GOES Project
Hurricane Floyd in the Sargasso Sea
A
Collection of Hurricane Floyd Images -- Data from NOAA
GOES satellite. Images produced by Dennis Chesters, Laboratory
for Atmospheres, NASA
Goddard Space Flight Center.
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New
Landsat 7 Images of the Earth Now Available
This
Landsat 7 browse image shows the area around New York City including Newark,
NJ and Long Island.
After
soaring to space last spring, NASA's latest Earth-imaging satellite has
completed its checkout phase and is now "open for business."
New images from the Landsat 7 spacecraft are now available for viewing
and purchase by scientific researchers and the general public via the
Internet from the United States Geological Survey (USGS) and NASA.
GSFC
Press Release 99-095
Landsat Image Site
07
September 1999
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Hurricane
Dennis
This image was captured by NASA's
SeaWiFS instrument onboard the SeaStar satellite on August 25 at 1:12
p.m. EDT. The purpose of the Sea-viewing Wide Field-of-view Sensor (SeaWiFS)
Project is to provide data on the global oceans. SeaWifs and several other
imaging devices aboard NASA satellites are providing meteorologists with
spectacular views of the turbulent tropics. ( Full Story) (8/26/99)
SeaWiFS
30 August 1999 view of Dennis - click on image for larger view. For
Hi-Res view visit the SeaWiFS
Homepage
August
28 GOES
Quick-Time Movie of Hurricane Dennis (8.9MB)
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Eclipse
99
On
Wednesday, August 11, 1999, a total eclipse of the Sun will be visible
from within a narrow corridor that traverses the Eastern Hemisphere. The
path of the Moon's umbral shadow begins in the Atlantic and crosses Central
Europe, the Middle East, and India where it ends at sunset in the Bay
of Bengal. A partial eclipse will be seen within the much broader path
of the Moon's penumbral shadow, which includes Northeastern North America,
all of Europe, Northern Africa and the western half of Asia. This event
is the last total solar eclipse of the 20th century, and it will benefit
formal and informal education communities alike.
Eclipse 99 Website - fact-filled
website on this eclipse, a history of eclipses and future eclipses.
Visit this site for images and movies from the Aug. 11 Eclipse.
http://www.williams.edu/Astronomy/eclipse99/
- composite image from Eclipse and SOHO EIT.
11
August 1999
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Landsat
7 Spacecraft to Join NASA's Earth Science Team
NASA
will deploy the first major satellite in an unprecedented program to check
the health of Planet Earth and understand the complex interactions that
drive global change with the April 15 launch of the Landsat 7, the latest
mission in the Landsat series, which has been documenting the Earths
surface for more than a quarter century.
For
more detail, check these links:
General Press Release 99-034
Landsat-7
Press Kit
31
March 1999
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Rapid
Thinning of the Greenland Ice Sheet
Click
on Image above to launch quick-time movie
This
movie depicts the airborne laser altimeter collecting data. In 1993
and 1994, NASA researchers surveyed the Greenland ice sheet using an airborne
laser altimeter. Ten flight lines flown in 1993 in southern Greenland
were resurveyed in 1998. Scientists used computers to create detailed
maps of changes in the ice.
The
Many Faces of Laser Altimetry
The same laser altimetry technology used to measure changes in the Greenland
glaciers was also used to measure the amount of ice in the frozen northern
polar cap of Mars and changes in the California coast due to severe El
Nino-driven storms in 1998.
A
study of Greenland indicates a rapid thinning of glaciers along the east
coast of the southern half of the island and suggests that the lower elevation
portion of the ice sheet may be particularly sensitive to changes in climate.
The results of this study are significant because they provide the first
evidence of widespread thinning of low-elevation parts of one of the great
polar ice sheets. Areas of ice thinning are shown in blue, areas where
ice is thickening are shown in orange.
NASA Researchers Document Shrinking Of Greenland's Glaciers (Details)
http://svs.gsfc.nasa.gov/~akekesi/Greenland/QuickTimes/plane.mov
-- movie courtesy of NASA/Goddard's Scientific
Visualization Studio
04
March 1999
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New
Animation Depicts Changs in Antarctic Ice Sheet
For the first time, scientists at NASA have generated a computer model
depicting changes in the Antarctic ice sheet since the peak of the last
ice age - nearly 20,000 years ago. The West Antarctic ice sheet has lost
nearly 2/3 of it's mass during this period - a volume sufficient to raise
sea level 33 feet.
West Antarctica is the most prominent remaining ice-filled marine basin
on Earth. It is drained by fast-moving ice streams that extend far into
the ice-sheet interior. There has been much debate over the potential
effect of West Antarctic's volume being released into the ocean. Scientists
hope to better understand the history of Antarctic ice sheet so they might
better predict how the ice sheet may respond to climate changes in the
future.
Dr. Bob Bindschadler Glaciologist, NASA Goddard Space Flight Center
Images and quicktimes can be downloaded after 8 a.m. Feb 3:
http://svs.gsfc.nasa.gov/~akekesi/Antarctica/
Background information:
http://igloo.gsfc.nasa.gov/wais/
http://igloo.gsfc.nasa.gov/science/perspective.html
Images/Movies courtesy of NASA Goddard Space Flight Center Scientific Visualization Studio - "Providing
an understanding of science through visualization."
17 February 1999
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Montserrat
explodes at dawn (0.9 MByte QT movie)
The
routine GOES-8 visible images are slightly contrast-enhanced to watch
the ash cloud rise to 20,000 ft (6 km), and spread across the lesser Antilles
Courtesy
of Dennis.Chesters@gsfc.nasa.gov
13 January 1999
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