DOI: 10.6084/m9.figshare.28861775
title: Raw and processed data from an Epsilometer integrated in an APEX float.

description: Temperature and shear microstructure data were collected by the epsilometer, a custom turbulence package, integrated onto a Teledyne-Webb APEX float. Profiles were conducted in both a controlled-ascent mode similar to the Argo mission ($\sim$ 0.08 m s$^{-1}$ rise rate) and at the float's maximum rise rate of $\sim$ 0.3 m s$^{-1}$, which might be used for shorter missions supporting process studies. In both modes, profiles of turbulent dissipation rate of kinetic energy $\varepsilon$ and thermal dissipation rate $\chi$ were computed. Valid $\varepsilon$ profiles were obtained in both profiling modes, though platform vibration was significant at the faster ascent rate, and probe sensitivity was reduced at the slower rise rate. Shear spectra resolve the viscous roll-off well, giving a noise floor for $\varepsilon$ of about 3$\times10^{-10}$ W kg$^{-1}$ in both modes. Individual temperature spectra also resolve the diffusive roll-off for $\chi$ about $2\times 10^{-11}$ K$^2$ s$^{-1}$ despite the presence of significant finescale structure in temperature, which impacted the quality of the temperature gradient spectra at low wavenumber. Following published best practices, each $\varepsilon$ and $\chi$ estimate was kept or rejected based on a figure of merit measuring the goodness of fit of the measured spectrum to the theoretical form. $\varepsilon$ cannot be computed when the buoyancy pump is active (3\% of the time) due to excessive vibrations. At other times, about $&gt;$65\% and 75\% of raw estimates of the turbulent dissipation rates $\varepsilon$ and $\chi$ met our quality-control criteria, respectively.<br><br>After loading the Profile structure, you can find the description of fields in varInfo. <br>Here is an example of the Profile Structure.<br>,<br>Profile = <br> struct with fields:<br> profNum: 1 filenames: {'apex_22_02_24_233233'} Meta_Data: [1×1 struct] varInfo: [1×1 struct] epsi: [1×1 struct] ctd: [1×1 struct] nbscan: 1461 nfft: 2048 nfftc: 341 fpump: 45 f: [0 0.0781 0.1562 0.2344 0.3125 0.3906 0.4688 0.5469 0.6250 0.7031 0.7812 0.8594 0.9375 1.0156 1.0938 1.1719 1.2500 1.3281 1.4062 1.4844 1.5625 1.6406 … ] (1×1025 double) k: [1461×1025 double] dnum: [1461×1 double] pr: [1461×1 double] z: [1461×1 double] w: [1461×1 double] t: [1461×1 double] s: [1461×1 double] th: [1461×1 double] sgth: [1461×1 double] pitch: [1461×1 double] roll: [1461×1 double] kvis: [1461×1 double] ktemp: [1461×1 double] ind_range_ctd: [1461×2 double] ind_range_epsi: [1461×2 double] epsilon: [1461×2 double] epsilon_co: [1461×2 double] epsilon_method: [1461×2 double] epsilon_final: [1461×1 double] epsi_qc: [1461×1 double] qc: [1×1 struct] sh_fc: [1461×2 double] sh_kc: [1461×2 double] chi: [1461×2 double] tg_fc: [1461×2 double] tg_kc: [1461×2 double] flag_tg_fc: [1461×2 double] fom: [1461×2 double] calib_volt: [1461×2 double] calib_vel: [1461×2 double] Ps_volt_f: [1×1 struct] Ps_velocity_f: [1×1 struct] Ps_shear_k: [1×1 struct] Ps_shear_co_k: [1×1 struct] Pt_volt_f: [1×1 struct] Pt_Tg_k: [1×1 struct] Pa_g_f: [1×1 struct] Cs1a3: [1461×1025 double] Cs2a3: [1461×1025 double] sumPa: [1×1 struct]<br>