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| Titel |
Space-borne clear air lidar measurements in the presence of broken cloud |
| VerfasserIn |
I. Astin, C. Kiemle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 21, no. 3 ; Nr. 21, no. 3, S.639-647 |
| Datensatznummer |
250014581
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| Publikation (Nr.) |
 copernicus.org/angeo-21-639-2003.pdf |
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| Zusammenfassung |
A number of proposed
lidar systems, such as ESA’s AEOLUS (formerly ADM) and DIAL missions (e.g.
WALES) are to make use of lidar returns in clear air. However, on average,
two-thirds of the globe is covered in cloud. Hence, there is a strong
likelihood that data from these instruments may be contaminated by cloud.
Similarly, optically thick cloud may not be penetrated by a lidar pulse,
resulting in unobservable regions that are overshadowed by the cloud. To
address this, it is suggested, for example, in AEOLUS, that a number of
consecutive short sections of lidar data (between 1 and 3.5 km in length) be
tested for cloud contamination or for overshadowing and only those that are
unaffected by cloud be used to derive atmospheric profiles. The prob-ability of
obtaining profiles to near ground level using this technique is investigated
both analytically and using UV air-borne lidar data recorded during the CLARE’98
campaign. These data were measured in the presence of broken cloud on a number
of flights over southern England over a four-day period and were chosen because
the lidar used has the same wavelength, footprint and could match the
along-track spacing of the proposed AEOLUS lidar.
Key words. Atmospheric composition
and structure (aerosols and particles) Meteorology and atmospheric dynamics
(instruments and techniques; general circulation) |
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