Abstract:
This dataset contains turbulence data collected from a vertical microstructure profiler (VMP-2000) during the September 2017 GoMix II cruise (R/V Point Sur, PS18_06) from 2017-08-18 to 2017-09-04. The experimental site is on the continental slope of the northern Gulf of Mexico, next to the Deepwater Horizon spill site. GoMix is a three-year project with the goal of understanding the mechanisms, spatial inhomogeneity and temporal intermittency of boundary mixing along the Northern Deepwater Gulf. The VMP used was a tethered instrument for vertical profiling of turbulence (VMP-2000) made by Rockland Scientific Inc. Temperature, salinity, velocity shear, and micro temperature were collected during the downcasts by the VMP-2000. The dataset includes the individual casts in binary (.p) and Matlab formats; a readme text file listing all possible parameters and their units; a text log file listing all events, and a summary file VMP_info.mat listing the geolocation and time data.
Data Parameters and Units:
Ax (Accelerometer x-axis [1/s]), Ay (Accelerometer y-axis [1/s]), Az (Accelerometer z-axis [1/s]), Day [integer], Gnd (ADC ground signal), Hour [integer], Milli, Minute [integer], Month [integer], Mx (Horizontal component of magnetic field from magnetometer), Mx_bad (Bad records of Mx), My (Horizontal component of magnetic field from magnetometer), My_bad (bad records of My), Mz (Vertical component of magnetic field from magnetometer), Mz_bad (Bad records of Mz), P (Pressure transducer without pre-emphasis in dB), P_dP (Pressure transducer with pre-emphasis in dB), P_fast (Fast response pressure in dB), P_slow (Slow response pressure in dB), SBC (Sea-Bird SBE4C conductivity sensor, not used, only noise), SBT (Sea-Bird SBE3F thermometer, not used, only noise), Second [integer], T1 (Thermistor probe #1 without pre-emphasis [digital unit]), T1_dT1 (Thermistor probe #1 with pre-emphasis [degree C]), T1_fast (Temperature #1 at fast sampling rate [degree C]), T1_slow (Temperature #1 at slow sampling rate [degree C]), T2 (Thermistor probe #2 without pre-emphasis [digital unit]), T2_dT2 (Thermistor probe #2 with pre-emphasis [degree C]), T2_fast (Temperature #2 at fast sampling rate [degree C]), T2_slow (Temperature #2 at fast sampling rate [degree C]), W_fast (Vertical velocity of the instrument at fast sample rate [m/s]), W_slow (Vertical velocity of the instrument at slow sample rate [m/s]), Year [integer], cfgobj (Configuration information), ch255 (Not used), date [YYY-MM-DD], filetime [Unix/epoch format], fs_fast (Fast frequency [1/s]), fs_slow (Slow frequency [1/s]), fullPath (Path of the file when it was created), gradT1 (Temperature #1 gradient [degree C/m]), gradT2 (Temperature #2 gradient [degree C/m]), header (Header information), header_version (Header version), input_parameters (input parameters for data processing), odas_version (software version), params (parameters for data processing), setupfilestr ( Instrument set up information), sh1 (Shear probe #1 [1/m]), sh2 (Shear probe #2 [1/m]), speed_fast (vertical speed at fast sampling rate [m/s]), speed_slow (vertical speed at slow sampling rate [m/s]), t_fast (time for fast response data [seconds]), t_fast_YD (time for fast response data [year date]), t_slow (time for slow response data [seconds]), t_slow_YD (time for slow response data [year date]), temperature_fast (temperature at fast sampling rate [degree C]), time [hh:mm:ss]), vehicle_info (vehicle operation information)
Note that cfgobj is a structure which specifies the configuration values and has the structure obgobj(1:21).{k,v}, where k is the key and v the value of the key [i.e., cfgobj(1).v(1) gives k = ‘rate’, v = 512, cfgobj(1).v(2) gives k = ‘prefix’, v = ‘VMP_’.
VMP_info.mat contains a table listing profile name, time [Unix/epoch format], latitude [degrees N], longitude [degrees], and water depth [m].
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