Turbulence Estimation Using Fast Response Thermistors Attached to a Free Fall Vertical Microstructure Profiler
AbstractEstimation of turbulence intensity with a fast response thermistor is examined by comparing the energy dissipation rate from a Fastip Probe, model 07 (FP07) thermistor with from a shear probe, both of which are attached to a free fall microstructure profiler with the fall rate of 0.6 0.7 m s 1. Temperature gradient spectra corrected with previously introduced frequency response functions represented by a single pole low pass filter yields with a bias that strongly depends on turbulence intensity. Meanwhile, the correction with the form of a double pole low pass filter derives less bias than of single pole low pass filter. The rate is compatible with when the double pole correction with the time constant of 3 x 10 3 s is applied, and 68% of data are within a factor of 2.8 of in the wide range of 10 10 3 x 10 7 W kg 1. The rate is still compatible with even in the anisotropy range, where the buoyancy Reynolds number is 20 100. Turbulence estimation from the fast response thermistor is thus confir.