Optical and in Situ Measuring of Structure Parameters Relevant to Temperature and Humidity, and Their Application to the Measuring of Sensible and Latent Heat Flux.

摘要

Optical measurements of the structure parameters of temperature (CT2), humidity (CQ2) and temperature-humidity (CTQ) were attempted at 0.94 micron, 10.7 micron (C02 laser) and 337 micron (HCN laser), but owing to various instrumental problems no measurement of CQ2 and CTQ could be achieved. In situ measurements of the same parameters were more successful. Two techniques of measuring structure parameters are compared: by using spaced sensors, and by time-lagging one sensor. In this way the expected r to the 2/3 power dependency of the structure parameter could be checked (r equal distance between sensors, either by spacing or by time-lagging). From the connection between structure parameters and spectra, evidence of an inertial subrange for the temperature-humidity cospectrum is found. Special attention is paid to the use of Ly-alpha hygrometry for measuring structure parameters involving humidity. Finally, relations between the structure parameters CT2 and CQ2, and the fluxes of heat and moisture are discussed; an effect of atmospheric stability was not detectable for -z/L>0.02. (Author)