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NASA scientists are joining with researchers

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from public and private institutions

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in a multi-year airborne campaign

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to study the humidity and chemical composition

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of a portion of our atmosphere.

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NASA's Airborne Tropical Tropopause Experiment

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or ATTREX

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will be flown on a remotely operated Global Hawk

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aircraft over the Pacific Ocean in 2013 and 14.

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The Tropopause is the boundry between

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Earth's troposphere and stratosphere.

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Led by the Ames Research Center,

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ATTREX will focus on small changes

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in stratospheric humidity that

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may significantly impact climate.

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The ATTREX science team recently

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integrated 11 specialized instruments

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onto a Global Hawk and verified their