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| Titel |
First Airborne Laser Remote Measurements of Atmospheric Carbon Dioxide for Future Active Sensing of Carbon Dioxide from Space |
| VerfasserIn |
E. V. Browell, M. E. Dobbs, J. Dobler, S. A. Kooi, Y. Choi, F. W. Harrison, B. Moore III, T. S. Zaccheo |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021201
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| Zusammenfassung |
| Future space missions to globally map atmospheric carbon dioxide (CO2) at all
latitudes during the day and night, such as the ASCENDS (Active Sensing of CO2
Emissions over Night, Day, and Seasons) mission, will require high-precision laser
measurements of CO2 columns across the troposphere from low Earth orbit. This paper
discusses the development and flight demonstration of a unique, multi-frequency,
single-beam, laser absorption spectrometer (LAS) that operates at 1.57 μm, which has been
developed for a future space-based mission to determine the global distribution of
regional-scale CO2 sources and sinks. A prototype of this space-based LAS system
was developed by ITT, and it has been successfully flight tested in six airborne
campaigns conducted in different geographic regions over the last four years. Flight tests
were conducted over Oklahoma, Michigan, New Hampshire, and Virginia under a
wide range of atmospheric conditions. Remote LAS measurements were compared
to high-quality in situ measurements obtained from instrumentation on the same
aircraft on spirals at the center of the LAS ground tracks. LAS flights were conducted
over a wide range of land and water reflectances and in the presence of scattered
clouds.
The LAS flight tests resulted in the first demonstration of high-precision, high-accuracy,
remote laser measurements of CO2 made from an airborne platform. The LAS CO2 column
measurements were found to have a precision of better than 2 ppm for a 100-m horizontal
average over land and a 1-km average over water. Absolute comparisons of CO2 remote and
in situ measurements showed agreement to better than 0.75 percent ( |
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