Tech

January 10, 2013

NASA chases climate change clues into the stratosphere

Starting this month, NASA will send a remotely piloted research aircraft as high as 65,000 feet over the tropical Pacific Ocean to probe unexplored regions of the upper atmosphere for answers to how a warming climate is changing Earth.

The first flights of the Airborne Tropical Tropopause Experiment, a multi-year airborne science campaign with a heavily instrumented Global Hawk aircraft, will take off from and be operated by NASA’s Dryden Flight Research Center at Edwards Air Force Base in California. The Global Hawk is able to make 30-hour flights.

Water vapor and ozone in the stratosphere can have a large impact on Earth’s climate. The processes that drive the rise and fall of these compounds, especially water vapor, are not well understood. This limits scientists’ ability to predict how these changes will influence global climate in the future. ATTREX will study moisture and chemical composition in the upper regions of the troposphere, the lowest layer of Earth’s atmosphere. The tropopause layer between the troposphere and stratosphere, 8 miles to 11 miles above Earth’s surface, is the point where water vapor, ozone and other gases enter the stratosphere.

Studies have shown even small changes in stratospheric humidity may have significant climate impacts. Predictions of stratospheric humidity changes are uncertain because of gaps in the understanding of the physical processes occurring in the tropical tropopause layer. ATTREX will use the Global Hawk to carry instruments to sample this layer near the equator off the coast of Central America.

“The ATTREX payload will provide unprecedented measurements of the tropical tropopause,” said Eric Jensen, ATTREX principal investigator at NASA’s Ames Research Center in Moffett Field, Calif. “This is our first opportunity to sample the tropopause region during winter in the northern hemisphere when it is coldest and extremely dry air enters the stratosphere.”

Led by Jensen and project manager Dave Jordan of Ames, ATTREX scientists installed 11 instruments in the Global Hawk. The instruments include remote sensors for measuring clouds, trace gases

and temperatures above and below the aircraft, as well as instruments to measure water vapor, cloud properties, meteorological conditions, radiation fields and numerous trace gases around the aircraft. Engineering test flights conducted in 2011 ensured the aircraft and instruments operated well at the very cold temperatures encountered at high altitudes in the tropics, which can reach minus 115 degrees Fahrenheit.

Six science flights are planned between Jan. 16 and March 15. The ATTREX team also is planning remote deployments to Guam and Australia in 2014. Scientists hope to use the acquired data to improve global model predictions of stratospheric humidity and composition. The ATTREX team consists of investigators from Ames and three other NASA facilities; the Langley Research Center in Hampton, Va., Goddard Space Flight Center in Greenbelt, Md., and Jet Propulsion Laboratory in Pasadena, Calif. The team also includes investigators from the National Oceanic and Atmospheric Administration, National Center for Atmospheric Research, academia, and private industry.

ATTREX is one of the first investigations in NASA’s new Venture-class series of low- to moderate-cost projects. The Earth Venture missions are part of NASA’s Earth System Science Pathfinder Program managed by Langley. These small, targeted science investigations complement

NASA’s larger science research satellite missions.

 




All of this week's top headlines to your email every Friday.


 
 

 
NASA photograph by Chris Rink

NASA flies stormy Kansas Skies this summer for science

NASA photograph by Chris Rink Richard Ferrare, a senior research scientist from the Atmospheric Sciences Division at NASA Langley Research Center in Hampton, Va., monitors the data input from the Lidar Atmospheric Sensing Exper...
 
 
NASA photograph by Carla Thomas

DC-8 reaches milestone

NASA photograph by Carla Thomas NASA’s DC-8 makes a low approach to Edwards Air Force Base. NASA’s DC-8 Flying Laboratory recently reached its third decade of delivering groundbreaking science. As a way to celebrate...
 
 
NASA photograph by Tom Tschida

NASA Armstrong leads team to test effects of volcanic ash on aircraft engines

NASA photograph by Tom Tschida Volcanic ash is sprayed into one of the F117 engines of a C-17 during the final phase of the Vehicle Integrated Propulsion Research (VIPR) project July 9 at Edwards. The VIPR team, comprised of NA...
 

 
NASA photograph

NASA, partners test unmanned aircraft systems

NASA photograph NASA’s Ikhana is being used to test a system that will allow uncrewed aircraft to fly routine operations within the National Airspace System. NASA, working with government and industry partners, is testing...
 
 
NASA photograph

NASA-developed air traffic management tool flies into use

NASA photograph NASA Future Flight Central is a national Air Traffic Control/Air Traffic Management (ATC/ATM) simulation facility. The two-story facility offers a 360-degree full-scale, real-time simulation of an airport, where...
 
 
NASA photograph

Robotics teams prepare to compete for $1.5 million in NASA Challenge

NASA photograph The Los Angeles team Survey’s robot is seen as it conducts a demonstration of the level two challenge during the 2014 NASA Centennial Challenges Sample Return Robot Challenge, Thursday, June 12, 2014, at t...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>