Scientists Probe The Jet Stream For Clues To Clear Air Turbulence

January 28, 1998

BOULDER -- Through early February, a team of scientists is sending probes into the jet stream over the Pacific Ocean to learn more about clear air turbulence. Research aircraft are dropping instruments over portions of the ocean to improve forecasts of weather systems and provide insight into the sudden, invisible gusts that pose an extreme hazard to aircraft. The program is a collaborative effort between the National Center for Atmospheric Research (NCAR), the National Oceanic and Atmospheric Administration (NOAA), the Federal Aviation Administration, and the Naval Research Laboratory (NRL) in Monterey, California. NCAR's primary sponsor is the National Science Foundation.

Commercial pilots flying east take advantage of the fast-moving winds at about 35,000 feet, in the jet stream's central core, to gain extra momentum. However, this puts them at risk for clear air turbulence. Twenty passengers aboard a Japanese airliner were injured on January 20 as the aircraft was struck by severe turbulence above the northwest Pacific just east of Japan. Scientists want to understand why some jet streams produce severe turbulence and others do not. "The idea is to examine the core's structure to see what role it might be playing in clear air turbulence," says NCAR scientist Robert Gall.

The special observations of turbulence are piggybacking onto the Winter Storm Reconnaissance flights being sponsored by NOAA's National Weather Service (NWS) in cooperation with the NOAA Aircraft Operations Center and the U.S. Air Force Reserves. Researchers are planning two dedicated missions with the NOAA G-IV aircraft from Honolulu between January 16 and February 15, in addition to the Winter Storm Reconnaissance flights.

Dropwindsondes deployed into turbulent areas of the jet stream will provide data on the structure of the jet stream between 27,000 and 45,000 feet, the flight altitude of major airlines. The project's data will be used to verify experimental turbulence prediction models at NCAR, NOAA, and NRL and to learn how operational NWS forecast models might be improved to give pilots more accurate warnings of turbulence.
-end-
NCAR is managed by the University Corporation for Atmospheric Research, a consortium of more than 60 universities offering Ph.D.s in atmospheric and related sciences.

Note to Editors: Members of the media are invited to participate in the Pacific data-gathering missions. For details on getting on the flights, flight dates, and times from Honolulu, contact: Delores Clark, NOAA Public Affairs, Honolulu, 808-532-6411.

Find this news release on the World Wide Web at http://www.ucar.edu/publications/newsreleases/1999/clearair.html

To receive UCAR and NCAR news releases by e-mail, telephone 303-497-8601 or send name, affiliation, postal address, fax, and phone number to butterwo@ucar.edu



National Center for Atmospheric Research/University Corporation for Atmospheric Research

Related Turbulence Articles from Brightsurf:

Turbulence affects aerosols and cloud formation
Turbulent air in the atmosphere affects how cloud droplets form.

Atmospheric turbulence affects new particle formation: Common finding on three continents
New particle formation (NPF) over three countries is investigated using aerosol physicochemical quantities and turbulence information.

Laser technology: The Turbulence and the Comb
While the light of an ordinary laser only has one single, well-defined wavelength, a so-called ''frequency comb'' consists of different light frequencies, which are precisely arranged at regular distances, much like the teeth of a comb.

Return of the Blob: Surprise link found to edge turbulence in fusion plasma
Correlation discovered between magnetic turbulence in fusion plasmas and troublesome blobs at the plasma edge.

Researchers unveil the universal properties of active turbulence
Turbulent flows are chaotic yet feature universal statistical properties.Over the recent years, seemingly turbulent flows have been discovered in active fluids such as bacterial suspensions, epithelial cell monolayers, and mixtures of biopolymers and molecular motors.

Unraveling turbulence
Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) may have identified a fundamental mechanism by which turbulence develops by smashing vortex rings head-on into each other, recording the results with ultra-high-resolution cameras, and reconstructing the collision dynamics using a 3D visualization program.

Researchers develop first mathematical proof for key law of turbulence in fluid mechanics
Turbulence is one of the least understood phenomena of the physical world.

A new parallel strategy for tackling turbulence on Summit
A Georgia Tech team developed an algorithm for simulating turbulence on Summit, the world's most powerful and smartest supercomputer.

Turbulence creates ice in clouds
Vertical air motions increase ice formation in mixed-phase clouds. This correlation was predicted theoretically for a long time, but could now be observed for the first time in nature.

Turbulence meets a shock
Interaction of shocks and turbulence investigated with a focus on high intensity turbulence levels.

Read More: Turbulence News and Turbulence Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.