3D water vapor field in the atmospheric boundary layer observed with scanning differential absorption lidar

Publication Type

Journal contribution (peer reviewed)

Authors

Späth, F., Behrendt, A., Muppa, S. K., Metzendorf, S., Riede, A., Wulfmeyer, V.

Year of publication

2016

Published in

Atmospheric Measurement Techniques

Band/Volume

9/

DOI

10.5194/amt-9-1701-2016

Page (from - to)

1701-1720

High-resolution three-dimensional (3-D) water vapor data of the atmospheric boundary layer (ABL) are required to improve our understanding of land–atmosphere exchange processes. For this purpose, the scanning differential absorption lidar (DIAL) of the University of Hohenheim (UHOH) was developed as well as new analysis tools and visualization methods. The instrument determines 3-D fields of the atmospheric water vapor number density with a temporal resolution of a few seconds and a spatial resolution of up to a few tens of meters. We present three case studies from two field campaigns. In spring 2013, the UHOH DIAL was operated within the scope of the HD(CP)² Observational Prototype Experiment (HOPE) in western Germany. HD(CP)² stands for High Definition of Clouds and Precipitation for advancing Climate Prediction and is a German research initiative. Range–height indicator (RHI) scans of the UHOH DIAL show the water vapor heterogeneity within a range of a few kilometers up to an altitude of 2 km and its impact on he formation of clouds at the top of the ABL. The uncertainty of the measured data was assessed for the first time by extending a technique to scanning data, which was formerly
applied to vertical time series. Typically, the accuracy of the DIAL measurements is between 0.5 and 0.8 g m ^-3 (or < 6 %) within the ABL even during daytime.....