Spatial heterodyne observations of water (SHOW) from a high-altitude airplane: characterization, performance, and first results
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Published:2019-01-25
Issue:1
Volume:12
Page:431-455
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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:
Langille Jeffery,Letros Daniel,Bourassa Adam,Solheim Brian,Degenstein Doug,Dupont Fabien,Zawada Daniel,Lloyd Nick D.
Abstract
Abstract. The Spatial Heterodyne Observations of Water instrument (SHOW) is a
limb-sounding satellite prototype that utilizes the Spatial Heterodyne
Spectroscopy (SHS) technique, operating in a limb-viewing configuration, to
observe limb-scattered sunlight in a vibrational band of water vapour within
a spectral window from 1363 to 1366 nm. The goal is to retrieve high
vertical and horizontal resolution measurements of water vapour in the upper
troposphere and lower stratosphere. The prototype instrument has been
configured for observations from NASA's ER-2 high-altitude airborne remote
science airplane. Flying at a maximum altitude of ∼21.34 km with a
maximum speed of ∼760 km h−1, the
ER-2 provides a stable platform to simulate observations from a low-earth
orbit satellite. Demonstration flights were performed from the ER-2 during an
observation campaign from 15 to 22 July 2017. In this paper, we present the
laboratory characterization work and the level 0 to level 1 processing of
flight data that were obtained during an engineering flight performed on
18 July 2017. Water vapour profile retrievals are presented and compared to
in situ radiosonde measurements made of the same approximate column of air.
These measurements are used to validate the SHOW measurement concept and
examine the sensitivity of the technique.
Funder
Canadian Space Agency
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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