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| Titel |
Near-infrared remote sensing of Los Angeles trace gas distributions from a mountaintop site |
| VerfasserIn |
D. Fu, T. J. Pongetti, J.-F. L. Blavier, T. J. Crawford, K. S. Manatt, G. C. Toon, K. W. Wong, S. P. Sander |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 3 ; Nr. 7, no. 3 (2014-03-06), S.713-729 |
| Datensatznummer |
250115643
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| Publikation (Nr.) |
 copernicus.org/amt-7-713-2014.pdf |
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| Zusammenfassung |
| The Los Angeles basin is a significant anthropogenic source of major
greenhouse gases (CO2 and CH4) and the pollutant CO, contributing
significantly to regional and global climate change. We present a novel
approach for monitoring the spatial and temporal distributions of greenhouse
gases in the Los Angeles basin using a high-resolution spectroscopic remote
sensing technique. A new Fourier transform spectrometer called CLARS-FTS has
been deployed since May, 2010, at Jet Propulsion Laboratory (JPL)'s California Laboratory for Atmospheric
Remote Sensing (CLARS) on Mt. Wilson, California, for automated long-term
measurements of greenhouse gases. The instrument design and performance of
CLARS-FTS are presented. From its mountaintop location at an altitude of
1673 m, the instrument points at a programmed sequence of ground target
locations in the Los Angeles basin, recording spectra of reflected near-IR
solar radiation. Column-averaged dry-air mole fractions of greenhouse gases
(XGHG) including XCO2, XCH4, and XCO are retrieved several times
per day for each target. Spectra from a local
Spectralon® scattering plate are also
recorded to determine background (free tropospheric) column abundances above
the site. Comparisons between measurements from LA basin targets and the
Spectralon® plate provide estimates of the
boundary layer partial column abundances of the measured species. Algorithms
are described for transforming the measured interferograms into spectra, and
for deriving column abundances from the spectra along with estimates of the
measurement precision and accuracy. The CLARS GHG measurements provide a
means to infer relative, and possibly absolute, GHG emissions. |
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