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- Title
Temperature profiling of the atmospheric boundary layer with rotational Raman lidar during the HD(CP)² observational prototype experiment.
- Authors
Hammann, E.; Behrendt, A.; Le Mounier, F.; Wulfmeyer, V.
- Abstract
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) Prototype Experiment (HOPE) in April and May 2013 are discussed. The lidar consists of a frequency-tripled Nd:YAG laser at 355 nm with 10W average power at 50Hz, 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, respectively, 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 significant advance 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. We present an example of a low-level temperature measurement which resolves the temperature gradient at the top of the stable nighttime boundary layer a hundred meters above the ground.
- Subjects
BOUNDARY value problems; RAMAN spectroscopy; TEMPERATURE measurements; POLYCHROMATORS; RAMAN effect; ATMOSPHERIC boundary layer
- Publication
Atmospheric Chemistry & Physics Discussions, 2014, Vol 14, Issue 21, p28973
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-14-28973-2014