NASA is marshaling agency resources to assist Gulf Coast-area facilities that suffered damage from Hurricane Katrina. The agency is preparing to provide help for NASA employees and contractors whose homes were damaged or destroyed.

Monday’s storm hit NASA’s Stennis Space Center in Mississippi and Michoud Assembly Facility in New Orleans, which is operated by Lockheed Martin. Both facilities are closed during recovery efforts. During the storm, hundreds of people including employees, family members and others took shelter at Stennis. A small contingency of NASA employees and contractors rode out the storm at Michoud. There are no reports of any injuries at NASA facilities.

“My heart goes out to all the people affected by this hurricane,” said NASA Administrator Michael Griffin. “I will be visiting Stennis and the Michoud Assembly Facility soon to talk with our people.”

NASA’s Marshall Space Flight Center, Huntsville, Ala., sustained minor damage and is providing support to Stennis and Michoud. Two helicopter flights from Marshall were delivering communication equipment and other supplies to the facilities today. Initial damage assessments indicate some buildings at Stennis sustained water and roof damage, but the exact extent has not been determined.

The Federal Emergency Management Agency is using the center as a staging area for local recovery efforts. The center’s Space Shuttle main engine test stands do not appear to be damaged.

At Michoud, which makes the Space Shuttle’s external fuel tanks, several buildings suffered window and roof damage. It appears that space flight hardware was not damaged, but a preliminary assessment has not been completed. The facility has no electrical power and communication is limited. Debris on roadways is restricting transportation around the facility.

Original press release: NASA Assesses Hurricane Katrina Damage (NASA)

New results shed light on how Antarctica became the icy, barren continent that we know today. British Antarctic Survey (BAS) scientists have discovered that 30-50 million years ago, South America and Antarctica split apart very rapidly. This formed the Drake Passage and resulted in a major global cooling. The findings are published in the latest issue of Earth and Planetary Science Letters.

Lead Author Dr Roy Livermore says ‘we deciphered the remarkable ‘herringbone’ pattern of ridges that were etched into the Earth’s crust beneath the remote Weddell Sea when South America moved away from Antarctica. This revealed that the two continents separated extremely quickly in geological time forming a shallow ‘gateway’ between the Pacific and Atlantic oceans. We estimate that this happened some ten to twenty million years earlier than the previous oldest estimate. Even a shallow (less than 1000 metres) gateway would have had a profound effect on Southern Ocean circulation and subsequently climate”.

Such a gateway, by completing a circuit of water around Antarctica, eventually led to the formation of the Antarctic Circumpolar Current, the world’s largest deep current which now transports some 130 million cubic metres of water through the Drake Passage every second. The effect was to cut Antarctica off from warm southward flowing currents leaving it frozen and desolate.

This new research reinforces findings from deep-sea sediments cores taken from the Southern Ocean and supports the theory that the opening of the Drake Passage could have triggered the abrupt global cooling event and extensive growth of the Antarctic ice sheet 33-34 million years ago.

Original press release: Early Drake Passage Opening Led to Global Change (BAS - British Antarctic Survey)

Real-time radar data and high-tech communications were the keystones to success this past weekend as the Rainband and Intensity Change Experiment (RAINEX) project began its research with Hurricane Katrina. The project is funded by the National Science Foundation (NSF).

RAINEX became the first hurricane research project to fly planes nearly simultaneously inside and outside a hurricane’s principal rainband, gathering information that will help scientists to better understand changes in a hurricane’s intensity.

RAINEX is studying the interaction between hurricane winds and rain, using data recorded from hurricane research flights, according to Steve Nelson, program director in NSF’s atmospheric sciences division, which funded RAINEX. For six weeks of this year’s active hurricane season, two research aircraft will fly simultaneously into hurricanes before the storms make landfall.

Flying in the hurricane’s outer bands and eyewall on most flights, the aircraft are using sophisticated Doppler radar and Global Positioning System dropsondes to record wind speed and direction, temperature, humidity, atmospheric pressure, and other critical data.

“While the forecasting of hurricane tracks has come a long way, that kind of information results from a variety of variables external to the hurricane,” says Robert Houze, an atmospheric scientist at the University of Washington and a RAINEX principal investigator. “Intensity is driven in part by internal dynamics between the rainbands and the eyewall - something that is very hard to get to - so this is landmark information that will help us to understand this phenomenon better.”

Shuyi Chen, a meteorologist and physical oceanographer at the University of Miami Rosenstiel School of Marine and Atmospheric Sciences (RSMAS), also a RAINEX principal investigator, developed a fine-resolution, coupled atmosphere-wave-ocean computer model to study hurricane intensity changes. While most models estimate atmospheric activity down to tens of kilometers, her model goes further - down to a kilometer or two, filling in information gaps and providing realistic rainband and eyewall structure simulation. Researchers are able to use the model in combination with airborne Doppler radar measurements to better understand hurricane intensity changes.

“The airborne radar data come into our operations center in real-time,” said Chen. “We process it, and then share it with the research planes within a few minutes. This helps the planes navigate and position themselves appropriately, and it helps us guide planes to exactly the area of the hurricane where we want to take measurements. It’s the first time we have ever tried this new way of communicating from the ground to planes flying in a hurricane.”

RAINEX also involves scientists from the National Center for Atmospheric Research (NCAR) in Boulder, Colo., the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Navy.

Original press release: Hurricane Katrina: Scientists Fly Into Eye of the Storm (NSF)

This season’s Antarctic ozone hole has swollen to an area of ten million square kilometres from mid-August - approximately the same size as Europe and still expanding. It is expected to reach maximum extent during September, and ESA satellites are vital for monitoring its development.

This year’s hole is large for this time of year, based on results from the last decade: only the ozone holes of 1996 and 2000 had a larger area at this point in their development.

Envisat’s Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) routinely monitors ozone levels on a global basis, continuing a dataset of measurements stretching back to mid-1995, previously made by the Global Ozone Monitoring Experiment (GOME) aboard the earlier ESA spacecraft ERS-2.

ESA data form the basis of an operational near-real time ozone monitoring and forecasting service forming part of the PROMOTE (PROtocol MOniToring for the GMES Service Element) consortium, made up of more than 30 partners from 11 countries, including the Royal Dutch Meteorological Institute (KNMI).

As part of the PROMOTE service, the satellite results are combined with meteorological data and wind field models so that robust ozone and ultraviolet forecasts can be made. In a first for ESA, these results are being used by the World Meteorological Organisation (WMO) to compile their regularly-updated Antarctic Ozone Bulletin.

The precise time and range of Antarctic ozone hole occurrences are determined by regional meteorological variations. During the southern hemisphere winter, the atmospheric mass above the Antarctic continent is kept cut off from exchanges with mid-latitude air by prevailing winds known as the polar vortex. This leads to very low temperatures, and in the cold and continuous darkness of this season, polar stratospheric clouds are formed that contain chlorine.

The stratospheric ozone layer that protects life on Earth from harmful ultraviolet (UV) radiation is vulnerable to the presence of certain chemicals in the atmosphere such as chlorine, originating from man-made pollutants like chlorofluorocarbons (CFCs).

Now banned under the Montreal Protocol, CFCs were once widely used in aerosol cans and refrigerators. CFCs themselves are inert, but ultraviolet radiation high in the atmosphere breaks them down into their constituent parts, which can be highly reactive with ozone.

As the polar spring arrives, the combination of returning sunlight and the presence of polar stratospheric clouds leads to splitting of chlorine into highly ozone-reactive radicals that break ozone down into individual oxygen molecules. A single molecule of chlorine has the potential to break down thousands of molecules of ozone.

The PROMOTE atmospheric ozone forecast seen here has atmospheric ozone measured in Dobson Units (DUs), which stands for the total thickness of ozone in a given vertical column if it were concentrated into a single slab at standard temperature and atmospheric pressure – 400 DUs is equivalent to a thickness of four millimetres, for example.

Developing out of the successful precursor Tropospheric Emission Monitoring Information Service (TEMIS), PROMOTE is a portfolio of information services covering the atmosphere part of the Earth System, operating as part of ESA’s initial Services Element of Global Monitoring for Environment and Security (GMES). This is a joint initiative between ESA and the European Commission to combine all available ground- and space-based information sources and develop a global environmental monitoring capability for Europe.

Original press release: South Polar Ozone Hole Makes Big Comeback (ESA)