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| Titel |
Temperature profiling of the atmospheric boundary layer with rotational Raman lidar during the HD(CP)2 Observational Prototype Experiment |
| VerfasserIn |
E. Hammann, A. Behrendt, F. Le Mounier, V. Wulfmeyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 5 ; Nr. 15, no. 5 (2015-03-12), S.2867-2881 |
| Datensatznummer |
250119519
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| Publikation (Nr.) |
 copernicus.org/acp-15-2867-2015.pdf |
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| Zusammenfassung |
| The temperature measurements of the rotational Raman lidar of the
University of Hohenheim (UHOH RRL) during the High Definition of
Clouds and Precipitation for advancing Climate Prediction
(HD(CP)2) Observation Prototype Experiment (HOPE) in April and May 2013 are
discussed. The lidar consists of a frequency-tripled Nd:YAG laser at
355 nm with 10 W average power at 50 Hz, a two-mirror
scanner, a 40 cm receiving telescope, and a highly efficient
polychromator with cascading interference filters for separating four
signals: the elastic backscatter signal, two rotational Raman signals
with different temperature dependence, and the vibrational Raman
signal of water vapor. The main measurement variable of the UHOH RRL
is temperature. For the HOPE campaign, the lidar receiver was
optimized for high and low background levels, with
a novel switch for the passband of the second rotational Raman
channel. The instrument delivers atmospheric profiles of water vapor
mixing ratio as well as particle backscatter coefficient and particle
extinction coefficient as further products. As examples for the
measurement performance, measurements of the temperature gradient and
water vapor mixing ratio revealing the development of the atmospheric
boundary layer within 25 h are presented. As expected from
simulations, a reduction of the measurement uncertainty of 70% during nighttime was achieved with
the new low-background setting. A two-mirror scanner allows for
measurements in different directions. When pointing the scanner to low
elevation, measurements close to the ground become possible which are
otherwise impossible due to the non-total overlap of laser beam and
receiving telescope field of view in the near range. An
example of a low-level temperature measurement is presented which resolves the
temperature gradient at the top of the stable nighttime boundary layer
100 m above the ground. |
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