Observation of sensible and latent heat flux profiles with lidar
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Published:2020-06-18
Issue:6
Volume:13
Page:3221-3233
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Behrendt AndreasORCID, Wulfmeyer VolkerORCID, Senff Christoph, Muppa Shravan Kumar, Späth FlorianORCID, Lange DiegoORCID, Kalthoff Norbert, Wieser Andreas
Abstract
Abstract. We present the first measurement of the sensible heat
flux (H) profile in the convective boundary layer (CBL) derived from the
covariance of collocated vertical-pointing temperature rotational Raman
lidar and Doppler wind lidar measurements. The uncertainties of the H
measurements due to instrumental noise and limited sampling are also derived
and discussed. Simultaneous measurements of the latent heat flux profile
(L) and other turbulent variables were obtained with the combination of water-vapor differential absorption lidar (WVDIAL) and Doppler lidar. The
case study uses a measurement example from the HOPE (HD(CP)2 Observational Prototype
Experiment) campaign, which took
place in western Germany in 2013 and presents a cloud-free well-developed
quasi-stationary CBL. The mean boundary layer height zi was at 1230 m
above ground level. The results show – as expected – positive values of
H in the middle of the CBL. A maximum of (182±32) W m−2, with the
second number for the noise uncertainty, is found at 0.5 zi. At about
0.7 zi, H changes sign to negative values above. The entrainment flux was
(-62±27) W m−2. The mean sensible heat flux divergence in the
observed part of the CBL above 0.3 zi was −0.28 W m−3, which
corresponds to a warming of 0.83 K h−1. The L profile shows a slight positive mean flux divergence of 0.12 W m−3 and an entrainment flux of (214±36) W m−2. The combination of H and L profiles in combination with variance and other turbulent parameters is very valuable for the evaluation of large-eddy simulation (LES) results and the further improvement and validation of turbulence parameterization schemes.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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