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| Titel |
An airborne amplitude-modulated 1.57 μm differential laser absorption spectrometer: simultaneous measurement of partial column-averaged dry air mixing ratio of CO2 and target range |
| VerfasserIn |
D. Sakaizawa, S. Kawakami, M. Nakajima, T. Tanaka, I. Morino, O. Uchino |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2013-02-19), S.387-396 |
| Datensatznummer |
250017397
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| Publikation (Nr.) |
 copernicus.org/amt-6-387-2013.pdf |
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| Zusammenfassung |
| Simultaneous measurements of the partial column-averaged dry air
mixing ratio of CO2 (XCO2) and target range were
demonstrated using airborne amplitude-modulated 1.57 μm
differential laser absorption spectrometer (LAS). The LAS system
is useful for discriminating between ground and cloud return signals
and has a demonstrated ability to suppress the impact of integrated
aerosol signals on atmospheric CO2 measurements.
A high correlation coefficient (R) of 0.987 between XCO2
observed by LAS and XCO2 calculated from in situ measurements
was obtained. The averaged difference in XCO2
obtained from LAS and validation data was within 1.5 ppm
for all spiral measurements. An interesting vertical profile was observed for
both XCO2LAS and XCO2val,
in which lower altitude CO2 decreases compared to higher altitude
CO2 attributed to the photosynthesis over grassland in the summer.
In the case of an urban area where there are boundary-layer enhanced CO2
and aerosol in the winter, the difference of XCO2LAS to
XCO2val is a negative bias of 1.5 ppm,
and XCO2LAS is in agreement with
XCO2val within the measurement precision of
2.4 ppm (1 SD). |
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