UAS Chromatograph for Atmospheric Trace Species (UCATS) – a versatile instrument for trace gas measurements on airborne platforms
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Published:2021-10-21
Issue:10
Volume:14
Page:6795-6819
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Hintsa Eric J.ORCID, Moore Fred L., Hurst Dale F.ORCID, Dutton Geoff S.ORCID, Hall Bradley D., Nance J. David, Miller Ben R., Montzka Stephen A.ORCID, Wolton Laura P.ORCID, McClure-Begley Audra, Elkins James W., Hall Emrys G.ORCID, Jordan Allen F.ORCID, Rollins Andrew W., Thornberry Troy D.ORCID, Watts Laurel A., Thompson Chelsea R.ORCID, Peischl JeffORCID, Bourgeois IlannORCID, Ryerson Thomas B.ORCID, Daube Bruce C., Gonzalez Ramos Yenny, Commane RoisinORCID, Santoni Gregory W., Pittman Jasna V., Wofsy Steven C., Kort Eric, Diskin Glenn S.ORCID, Bui T. Paul
Abstract
Abstract. UCATS (the UAS Chromatograph for Atmospheric Trace Species) was
designed and built for observations of important atmospheric trace gases
from unmanned aircraft systems (UAS) in the upper troposphere and lower
stratosphere (UTLS). Initially it measured major chlorofluorocarbons (CFCs)
and the stratospheric transport tracers nitrous oxide (N2O) and sulfur
hexafluoride (SF6), using gas chromatography with electron capture
detection. Compact commercial absorption spectrometers for ozone (O3)
and water vapor (H2O) were added to enhance its capabilities on
platforms with relatively small payloads. UCATS has since been reconfigured
to measure methane (CH4), carbon monoxide (CO), and molecular hydrogen
(H2) instead of CFCs and has undergone numerous upgrades to its
subsystems. It has served as part of large payloads on stratospheric UAS
missions to probe the tropical tropopause region and transport of air into
the stratosphere; in piloted aircraft studies of greenhouse gases,
transport, and chemistry in the troposphere; and in 2021 is scheduled to
return to the study of stratospheric ozone and halogen compounds, one of its
original goals. Each deployment brought different challenges, which were
largely met or resolved. The design, capabilities, modifications, and some
results from UCATS are shown and described here, including changes for
future missions.
Funder
Earth Sciences Division
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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