NASA gears up for airborne study of earth's radiation balance

Dec 06, 2011 By Ruth Dasso Marlaire and Beth Hagenauer

(PhysOrg.com) -- NASA scientists have successfully completed flight tests in preparation for deployment of a multi-year airborne science campaign to study the humidity and chemical composition of air entering the tropical tropopause layer of the atmosphere. NASA's Airborne Tropical TRopopause EXperiment (ATTREX) will conduct the science campaign over the Pacific Ocean from three locations in 2013 and 2014.

Studies have shown that even small changes in stratospheric humidity may have that are significant compared to those of decadal increases in . Predictions of stratospheric humidity changes are uncertain, due to gaps in the understanding of the physical processes occurring in the tropical layer, which ranges from about eight to 11 miles above the ground.

“These were test flights, although we did get science-quality data, including samples from tropical thin cirrus clouds at about 55,000 feet altitude,” said Leonhard Pfister, ATTREX deputy principal investigator at NASA’s Ames Research Center, Moffett Field, Calif. “These clouds regulate water vapor in the lower tropical stratosphere, which is important for Earth's radiation balance.”

Pfister will discuss the ATTREX mission goals, objectives and planned research flights at the Monday Dec. 5 afternoon poster session at the American Geophysical Union Fall meeting held at the Moscone Center, San Francisco, Calif.

Led by principal investigator Eric Jensen and project manager Dave Jordan of NASA Ames, scientists integrated instruments onto one of NASA's Global Hawk unmanned aircraft and verified their operation during four checkout flights from NASA's Dryden Flight Research Center at Edwards, Calif.

Eleven instruments were successfully installed aboard NASA’s Global Hawk Unmanned Aircraft System, which is capable of 24 to 30 hours of flight. The instruments include remote sensors for measuring clouds and temperature above and below the aircraft as well as in situ instruments for measuring water vapor, cloud properties, meteorological conditions, radiation fields, and numerous trace gases. Test flights occurred Oct. 20 through Nov. 10 in the restricted area over Edwards Air Force Base, Calif. and the tropical eastern Pacific. On one long-duration fight, the aircraft flew farther south than any previous NASA Global Hawk science mission, reaching 6.5 degrees north latitude.

In addition to testing the instruments and obtaining preliminary science data, the flights were useful for evaluating the ability of the to operate at very cold temperatures encountered at high altitudes in the tropics.

The team consists of investigators from NASA (including the Ames, Dryden and Langley research centers, Goddard Space Flight Center, and the Jet Propulsion Laboratory), the National Oceanic and Atmospheric Administration (NOAA), the National Center for Atmospheric Research (NCAR), three universities and private industry. The specialized instruments include a lidar, a spectrometer, a photometer, a chromatograph, a radiometer, hygrometers and several sensors that collect atmospheric data.

The science team will return to NASA Dryden in January 2013 to begin collecting science data with deployments to the Pacific region continuing in January and June 2014. Scientists hope to use the data to improve global model predictions of stratospheric humidity and composition.

Jensen's proposal for ATTREX was competitively selected and is one of the first investigations in ’s new Venture-class series of low-to-moderate cost projects announced in May 2010. The Earth Venture missions are part of NASA's Earth System Science Pathfinder program. These small, targeted science investigations complement NASA's larger science research satellite missions.

Explore further: Tropical Storm Marie forms in Pacific off Mexico

add to favorites email to friend print save as pdf

Related Stories

Scientists prepare for coming ATTREX climate study

Nov 14, 2011

A consortium of scientists are in the early stages of preparation for a multi-year airborne science campaign to study the humidity and chemical composition of air entering the tropical tropopause layer of ...

NASA's Global Hawks mark year of science flights

Apr 06, 2011

This week marks the first anniversary of the NASA Global Hawk project’s initial science mission. On April 7, 2010, Global Hawk No. 872 took off from NASA’s Dryden Flight Research Center on Edwards ...

NASA to fly into hurricane research this summer

Jul 07, 2010

Three NASA aircraft will begin flights to study tropical cyclones on Aug. 15 during the agency's first major U.S.-based hurricane field campaign since 2001. The Genesis and Rapid Intensification Processes ...

DC-8 flying lab validates laser instruments

Aug 11, 2011

(PhysOrg.com) -- Twenty scientists went aloft aboard NASA’s DC-8 flying laboratory in late July to conduct an airborne test of four very different laser techniques for remotely measuring atmospheric carbon ...

NASA airborne expedition chases climate, ozone questions

Jun 27, 2007

NASA's Tropical Composition, Cloud and Climate Coupling (TC4) field campaign will begin this summer in San Jose, Costa Rica, with an investigation into how chemical compounds in the air are transported vertically into the ...

Recommended for you

NASA sees Tropical Storm Karina get a boost

14 hours ago

NASA's TRMM satellite saw Tropical Storm Karina get a boost on August 22 in the form of some moderate rainfall and towering thunderstorms in the center of the storm.

User comments : 0