Record Details

Overview of the Airborne Tropical TRopopause EXperiment (ATTREX)
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Author and Affiliation:
Jensen, Eric(NASA Ames Research Center, Moffett Field, CA United States)
Abstract: The NASA Airborne Tropical TRopopause EXperiment (ATTREX) is a series of airborne campaigns focused on understanding physical processes in the Tropical Tropopause Layer (TTL) and their role in atmospheric chemistry and climate. ATTREX is using the high-altitude, long-duration NASA Global Hawk Unmanned Air System to make in situ and remote-sensing measurements spanning the Pacific. A particular ATTREX emphasis is to better understand the dehydration of air as it passes through the cold tropical tropopause region. The ATTREX payload contains 12 in situ and remote sensing instruments that measure water vapor, clouds, multiple gaseous tracers (CO, CO2, CH4, NMHC, SF6, CFCs, N2O), reactive chemical compounds (O3, BrO, NO2), meteorological parameters, and radiative fluxes. ATTREX flight series have been conducted in the fall of 2011 from Armstrong Flight Research Center (AFRC) in California, in the winter of 2013 from AFRC, and in the winter/spring of 2014 from Guam. The first two flight series provided extensive sampling of the central and eastern Pacific, whereas the last flight series permitted sampling in the western Pacific. The sampling strategy has primarily involved repeated ascents and descents through the depth of the TTL (about 13-19 km). Over 100 TTL profiles were obtained on each flight series. The ATTREX dataset includes TTL water vapor measurements with unprecedented accuracy, ice crystal size distributions and habits. The cloud and water measurements provide unique information about TTL cloud formation, the persistence of super-saturation with respect to ice, and dehydration. The plethora of tracers measured on the Global Hawk flights are providing unique information about TTL transport pathways and time scales. The meteorological measurements are revealing dynamical phenomena controlling the TTL thermal structure, and the radiation measurements are providing information about heating rates associated with TTL clouds and water vapor. This presentation will provide an overview of the ATTREX flights, examples of measurements from the flights, and plans for modeling/analysis of the ATTREX dataset.
Publication Date: Apr 12, 2015
Document ID:
20160001334
(Acquired Feb 02, 2016)
Subject Category: METEOROLOGY AND CLIMATOLOGY; EARTH RESOURCES AND REMOTE SENSING
Report/Patent Number: ARC-E-DAA-TN20929
Document Type: Conference Paper
Meeting Information: European Geosciences Union General Assembly 2015; 12-17 Apr. 2015; Vienna; Austria
Meeting Sponsor: European Geosciences Union; Munich, Germany
Bundesministerium fuer Wissenschaft und Forschung; Vienna, Austria
Contract/Grant/Task Num: WBS 153351.05.02.01.02
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA United States
Organization Source: NASA Ames Research Center; Moffett Field, CA United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: TROPICAL REGIONS; TROPICAL METEOROLOGY; TROPOPAUSE; METEOROLOGICAL PARAMETERS; SAMPLING; CLOUDS (METEOROLOGY); ICE; WATER VAPOR; DEHYDRATION; ATMOSPHERIC CHEMISTRY; CLIMATE; TEMPERATURE DISTRIBUTION; IN SITU MEASUREMENT; PACIFIC OCEAN; REMOTE SENSING
Other Descriptors: ATTREX; TROPICAL; TROPOPAUSE
Availability Notes: Abstract Only
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