Structure parameters for temperature and humidity from simultaneous eddy-covariance and scintillometer measurements

Line-averaged values of the structure parameters of temperature and humidity, C-T(2) and C-q(2), were estimated from simultaneous measurements with an optical and a microwave scintillometer over a path of 4.7 km length at the Meteorological Observatory Lindenberg during the LITFASS-2003 experiment. By cross-correlating the detected signals of the two scintillometers, the temperature-humidity structure parameter, C-Tq, and the temperature-humidity correlation, r(Tq), were also derived directly from the measurements. Comparison with corresponding values obtained from local measurements with an eddy-covariance system on a meteorological tower show a consistent behaviour in time (with some exceptions especially for C-q(2) and r(Tq) during nighttime). The deviations are of a magnitude between 20 % and 35 % of the typical daytime values of the structure parameters.