README

This document describes the contents of this repository which contains the data products used in "Acoustic Sensing of Ocean Mixed Layer Depth and Temperature from Uplooking ADCPs", by Brenner et al., (2022). These data were collected as part of the Stratified Ocean Dynamics of the Arctic (SODA) project; more information about the project can be found at apl.uw.edu/soda

Data are included as the following .mat files:
Input data
- adcpData/adcpCmb.mat
- mldIdentification/sigBackscatter.mat
- mldIdentification/whBackscatter.mat
- tsData/moorCTD.mat
- tsData/SG229.mat
Derived quantities
- mldIdentification/sigbsMLDs.mat
- mldIdentification/whbsMLDs.mat
- mldIdentification/shearMLDs.mat
- mldIdentification/combinedMLD.mat


Descriptions of each of the files follow.

    adcpCmb.mat

    Contain Matlab-readable nested stuctures of ADCP data, with a field corresponding to each of the three moorings (SODA_A, SODA_B, and SODA_C). For each mooring, the structure contains the fields:
    - mtime                     Time in Matlab serial date format (days from Jan 0, 0000)
    - ranges                    Distance from the deepest ADCP bin in meters
    - depth                     Depth of deepest ADCP bin in meters (to get the depth of any individual bin, d=depth-ranges)
    - east_vel                  Meridional velocity in meters per second
    - north_vel                 Zonal velocity in meters per second
    - extrap_flag               A flag to identify bins where data were extrapolated (1=extrapolated)
    - sig500headingCorrected    Corrected instrument heading (degrees) for SIG500 (see Brenner, 2022, Chapter 2; https://digital.lib.washington.edu:443/researchworks/handle/1773/49108)
    - wh500headingCorrected     Corrected instrument heading (degrees) for WH300 (see Brenner, 2022, Chapter 2; https://digital.lib.washington.edu:443/researchworks/handle/1773/49108)



    sigBackscatter.mat & whBackscatter.mat

    These files are identically structured, and vary by data source (SIG500: sigBackscatter.mat; WH300: whBackscatter.mat) Each file contains Matlab-readable nested structures of ADCP-derived backscatter, with a field corresponding to each of the three moorings (SODA_A, SODA_B, and SODA_C). For each mooring, the structure contains the fields:
    - mattime       Time in Matlab serial date format (days from Jan 0, 0000)
    - depth         /Height/ (negative underwater) of ADCP bin center in meters
    - SV            Relative backscatter (calculated following eq. 1) in dB



    moorCTD.mat

    Contains Matlab-readable nested structures of mooring CTD data, with a field corresponding to each of the three moorings (SODA_A, SODA_B, and SODA_C). For each mooring, the structure contains the fields:
    - lat           Mooring latitude
    - lon           Mooring longitude
    - mattime       Time in Matlab serial date format (days from Jan 0, 0000)
    - salinity      Practical salinity in PSU
    - temperature   Temperature in degrees Celsius
    - pressure      Sea pressure in dbar
    - depth         Depth in meters



    SG229.mat

    Contains a Matlab-readable structure of Seaglider measurements from Seaglider SG229.



    sigbsMLDs.mat & whbsMLDs.mat & shearMLDs.mat

    These files are nearly identically structured and contain timeseries of the mixed layer depths derived from each of the data sources described in the manuscript:
      sigbsMLDs.mat   from the SIG500 backscatter
      whbsMLDs.mat    from the WH300 backscatter
      shearMLDs.mat   from the near-inertial shear
    Each file contains Matlab-readable nested structures of corresponding to each of the three moorings (SODA_A, SODA_B, and SODA_C). For each mooring, the structure contains the fields:
    - mattime       Time in Matlab serial date format (days from Jan 0, 0000)
    - mlds          Mixed layer depth (MLD) at each time point in meters
    - weights       Measurement weight assigned to each estimate of MLD (as described in the manuscript)
    Additional fields contain averaged/filtered fields of the backscatter or shear used to derive these measurements.



    combinedMLD.mat

    Contain Matlab-readable nested stuctures of the final derived timeseries of MLD, with a field corresponding to each of the three moorings (SODA_A, SODA_B, and SODA_C). For each mooring, the structure contains the fields:
    - mattime       Time in Matlab serial date format (days from Jan 0, 0000)
    - MLD           Mixed layer depth in meters