NOAA
AND PARTNERS CONDUCT FIRST SUCCESSFUL UNMANNED AIRCRAFT HURRICANE OBSERVATION
BY FLYING THROUGH OPHELIA
Sept.
16, 2005 � Hurricane researchers at the NOAA
Atlantic Oceanographic and Meteorological Laboratory in Miami, Fla.,
marked a new milestone in hurricane observation as the first unmanned
aircraft touched down after a 10-hour mission into Tropical Storm Ophelia,
which lost its hurricane strength Thursday night. The aircraft, known
as an Aerosonde, provided the first-ever detailed observations of the
near-surface, high wind hurricane environment, an area often too dangerous
for NOAA and U.S. Air Force Reserve
manned aircraft to observe directly. (Click image for larger
view of the Aerosonde unmanned aerial vehicle being released from its
transport vehicle on the runway at the NASA Wallops flight Facility,
in Wallops Island, Va., to fly into and take measurements of Tropical
Storm Ophelia on Sept. 16, 2005. Click
here for high resolution version. Photo courtesy of NASA.)
"It's been a long road to get to this point, but it was well worth
the wait," said Joe Cione, NOAA hurricane researcher at AOML and
the lead scientist on this project. "If we want to improve future
forecasts of hurricane intensity change we will need to get continuous
low-level observations near the air-sea interface on a regular basis,
but manned flights near the surface of the ocean are risky. Remote unmanned
aircraft such as the Aerosonde are the only way. Today we saw what hopefully
will become 'routine' in the very near future."
NOAA's
partners in this effort include the Aerosonde company, which designed
and operates the aircraft, and NASA
Goddard's Wallops Flight Facility, located on Virginia's Eastern
Shore, which houses the U.S. base for Aerosonde
North America and served as the departure and landing location for
this historic flight. The Aerosonde hurricane project is funded by NASA
and NOAA Research in order to test this promising new observational
tool. (Click NOAA satellite image for larger view of Tropical
Storm Ophelia taken on Sept. 16, 2005, at 9:15 a.m. EDT, as the storm
made its way into the Atlantic after battering the southeastern United
States as a Category One hurricane. It was downgraded Thursday night.
Click here for high
resolution version. Please credit “NOAA.”)
"The concept of the Aerosonde as a small, robust unmanned autonomous
vehicle, or AUV, arose directly from our need for observations in dangerous
areas such as the hurricane surface layer," said Greg Holland,
president of Aerosonde North America and one of the Aerosonde originators.
"I am particularly grateful to the hard work by Aerosonde staff
and the support of NOAA and NASA that has now made this possible."
The Aerosond was launched at about 7:30 a.m. EDT on Friday and returned
at about 5:30 p.m. "in pristine condition," according to Aerosonde
North America.
While the
successful use of NOAA's WP-3D
Orion, its Gulfstream-IV
aircraft and the U.S. Air Force Reserve's WC-130H
aircraft have been important tools in the arsenal to understand tropical
cyclones, detailed observations of the near-surface hurricane environment
have been elusive because of the severe safety risks associated with
low level manned flight missions. The main objective of the Aerosonde
project addresses this significant observational shortcoming by using
the unique long endurance and low-flying attributes of the unmanned
Aerosonde observing platform, flying at altitudes as low as 500 feet.
Tropical Storm Ophelia provided the perfect test case for using Aerosondes
as it was a minimal hurricane within flight range of the Wallops Flight
Facility.
The Aerosonde platform that flew into Ophelia was specially outfitted
with sophisticated instruments used in traditional hurricane observation,
including instruments such as mounted Global Position System (GPS) dropwindsondes
and a satellite communications system that relayed information on temperature,
pressure, humidity and wind speed every half second in real-time. The
Aerosonde also carried a downward positioned infrared sensor that was
used to estimate the underlying sea surface temperature. All available
data were transmitted in near-real time to the NOAA National Hurricane
Center and AOML, where the NOAA Hurricane Research Division is located.
The environment where the atmosphere meets the sea is critically important
in hurricanes as it is where the ocean's warm water energy is directly
transferred to the atmosphere just above it. The hurricane/ocean interface
also is important because it is where the strongest winds in a hurricane
are found and is the level at which most citizens live. Observing and
ultimately better understanding this region of the storm is crucial
to improve forecasts of hurricane intensity and structure. Enhancing
this predictive capability would not only save the U.S. economy billions
of dollars, but more important, it could save many lives.
Accomplishments from this first flight include detailed documentation
of an unsampled region of the hurricane while simultaneously providing
the NOAA National Hurricane Center with real-time near surface wind
and thermodynamic data from within Tropical Storm Ophelia. In addition,
detailed comparisons between in-situ and satellite-derived observations
also will be possible. It is also envisioned that this unique data could
ultimately be used to help initialize and verify both operational and
research-oriented numerical simulations.
NOAA, an
agency of the U.S. Department of
Commerce, is dedicated to enhancing economic security and national
safety through the prediction and research of weather and climate-related
events and providing environmental stewardship of the nation's coastal
and marine resources.
Relevant Web Sites
NOAA
Aerosonde Project Update
NOAA
Atlantic Oceanographic and Meteorological Laboratory
NOAA Hurricane Research Division
Media
Contact:
Jana Goldman, NOAA
Research, (301) 713-2483 ext. 181
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