Japan Geoscience Union Meeting 2019

Presentation information

[E] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS09] Ocean Mixing Processes: Impact on Biogeochemistry, Climate and Ecosystem

Sun. May 26, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Ichiro Yasuda(Atmosphere and Ocean Research Institute, The University of Tokyo), Toshiyuki Hibiya(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Jun Nishioka(Hokkaido University, Institute of low temperature sciences), Shin-ichi Ito(Atmosphere and Ocean Research Institute, The University of Tokyo)

[AOS09-P01] Correction method of fast-response thermistors data to estimate turbulence intensity

*kimura shino1, Yasutaka Goto2, Koenjong Lee1, Ichiro Yasuda1 (1.The Univercity of Tokyo, 2.Meteorological Agency)

Keywords:vertical mixing, turbulence

Fast-response thermistors (FP07) can be used to estimate turbulent energy dissipation rate εand temperature dissipation rate χ. However, correction is necessary because the insufficient response of FP07 causes underestimate for relatively strong turbulence and individual FP07 sensors have different response. In this study, using simultaneously observed shear probe and FP07 data from a free fall microstructure profiler descending at the speed of 0.6-0.7 m/s, ε_T from various FP07 are compered with ε_S from shear probe to estimate how much correction is necessary for FP07 data. For 3 (7) msec time constant of FP07 for double-pole (single-pole) correction, ε_T is consistent with ε_S within a factor of 3 in the range of ε_S =10^-10 ~10^-7 W/kg. In the presentation we also discuss the impact of correction on χ and the validity of ε_T under double diffusion.