Documentation of variables contained in the Transition Layer Float dataset

This dataset contains three types files measured in the Fall 2018 deployment of the Transition Layer Float in the northeastern Pacific near Ocean Weather Station Papa (50N, 145W), funded by NSF grant OCE-1657676. These data were used in the preparation of the manuscript "High-resolution observations of the North Pacific transition layer from a Lagrangian float", to be submitted to the Journal of Physical Oceanography. 

Alexis K Kaminski
kaminski@berkeley.edu
Coauthors: Eric D’Asaro, Andrey Shcherbina, Ramsey Harcourt
Feb. 3, 2021

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Env7516-Dec-2018.mat

This file contains the CTD measurements and location information from the deployment in the following variables:
yd: Yearday of 2018
Mtime: Matlab time
P: Pressure of float center (dbar). 0 is approximately ocean surface
PP: Middle and bottom pressures (dbar)
S: Top and bottom salinity (psu)
T: Top and bottom temperature (deg C)
Th: Top and bottom potential temperature (Unesco 1983) (deg C)
Sig0: Top and bottom potential density (Unesco 1983)
mode: Float operating mode: 0-down 2-up 1-settle
lon: longitude linearly interpolated from GPS
lat: latitude linearly interpolated from GPS
GPS: Raw GPS
meta: file metadata

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TCH_0_55_25-Dec-2018.mat, TCH_1_55_25-Dec-2018.mat

These files contain the measurements from the two float thermistor chains in the following variables:
Mtime: Matlab time adjusted to float -223.9s
yd: yearday: equals 1 on Jan-01-2018 00Z
TC: calibrated T-chain temperature array (deg C)
dz: Distance upward from central pressure (m) of each temperature measurement
Pressure: ADCP pressure adjusted to float center (394mm above ADCP) & corrected for atmospheric pressure (dbar)
meta: file metadata

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HR_ADCP_data.zip, LR_ADCP_data.zip, vertical_beam_ADCP_data.zip

Each of these zip files contains the low-resolution, high-resolution, and vertical-beam (respectively) data from the up-looking 5-beam Nortek Signature1000 ADCP mounted on the float. Data are stored in the following variables in each individual file:

Accelerometer: acceleration data (m^2/s)
AmbiguityVel: ambiguity velocity for unwrapping algorithm (m/s)
Amp: signal amplitude
BlankingDistance: blanking distance between instrument and first measurement cell (m)
CellSize: size of individual vertical cells (m)
Cor: data correlations
Heading: ADPC heading (deg)
Magnetometer: magnetometer measurements
Mtime: Matlab time
NBeams: number of beams
NCells: number of vertical cells in measurement array
Pitch: ADCP pitch angle (deg)
Pressure: ADCP pressure (dbar)
Range: measurement range (m)
Roll: ADCP roll angle (deg)
Temperature: temperature measurements (degC)
Vel: along-beam velocity measurements (m/s)
zUP: Vertical direction (1 is up)