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 (C sub T, sup 2), humidity (C sub Q, sup 2) and temperature-humidity (C sub TQ) were attempted at 0.94 micrometers, 10.7 micrometers (CO2 laser) and 337 micrometers (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 = 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.