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| Titel |
The mobile Water vapor Aerosol Raman LIdar and its implication in the framework of the HyMeX and ChArMEx programs: application to a dust transport process |
| VerfasserIn |
P. Chazette, F. Marnas, J. Totems |
| 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. 6 ; Nr. 7, no. 6 (2014-06-10), S.1629-1647 |
| Datensatznummer |
250115813
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| Publikation (Nr.) |
 copernicus.org/amt-7-1629-2014.pdf |
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| Zusammenfassung |
| The increasing importance of the coupling of water and aerosol cycles in
environmental applications requires observation tools that allow
simultaneous measurements of these two fundamental processes for
climatological and meteorological studies. For this purpose, a new mobile
Raman lidar, WALI (Water vapor and Aerosol LIdar), has been developed and
implemented within the framework of the international HyMeX and ChArMEx
programs. This paper presents the key properties of this new device and its
first applications to scientific studies. The lidar uses an eye-safe
emission in the ultraviolet range at 354.7 nm and a set of compact
refractive receiving telescopes. Cross-comparisons between rawinsoundings
performed from balloon or aircraft and lidar measurements have shown a good
agreement in the derived water vapor mixing ratio (WVMR). The discrepancies
are generally less than 0.5 g kg−1 and therefore within the error
bars of the respective instruments. A detailed study of the uncertainty of
the WVMR retrieval was conducted and shows values between 7 and 11%, which
is largely constrained by the quality of the lidar calibration. It also
proves that the lidar is able to measure the WVMR during daytime over a
range of about 1 km. In addition the WALI system provides measurements of
aerosol optical properties such as the lidar ratio (LR) or the particulate
depolarization ratio (PDR). An important example of scientific application
addressing the main objectives of the HyMeX and ChArMEx programs is then
presented, following an event of desert dust aerosols over the Balearic
Islands in October 2012. This dust intrusion may have had a significant
impact on the intense precipitations that occurred over southwestern France
and the Spanish Mediterranean coasts. During this event, the LR and PDR
values obtained are in the ranges of ~45–63 ± 6 and
0.10–0.19 ± 0.01 sr, respectively, which is representative of dust
aerosols. The dust layers are also shown to be associated with significant
WVMR, i.e., between 4 and 6.7 g kg−1. |
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