Netcdf meta data (shear probes)

Below we list the metadata required in a NetCDF data file, as well as the optional meta data we highly recommend that are included with the data set.

The parameter names should be used as listed (attention to underscores). The descriptions are example text or several options that are available for that parameter.

Required Metadata

Parameter Name	Description
title	e.g., Vertical micostructure profiler data from cruise XXX
summary	required by ACDD
comment	required by CF
platform_type	research vessel, sub-surface glider etc
creation_time	netCDF file creation time (required by CF-Standard). Format: yyyy-mm-ddTHH:MM:SSZ
date_created	same as "creation time". Format: yyyy-mm-ddTHH:MM:SSZ
date_update	Time of the latest revision: Format: yyyy-mm-ddTHH:MM:SSZ
time_reference_year	year for time reference
fs_fast	sampling frequency for fast channels
fs_slow [math]\displaystyle{ ^a }[/math]	sampling frequency for slow channels
profiling_direction	horizontal, vertical, glide
fft_length	as data points (note, fft_lengths_sec in seconds is optional)
diss_length	as data points
overlap	(for diss_length) as data points
num_fft_segments	number of FFT segments
goodman	0=not applied; 1=applied
HP_cut	the high-pass filter cutoff frequency in Hz. Can be zero for no filtering.
conventions	CF-1.6, ACDD-1.3, ATOMIX
history	Version 1
data_mode	D #(D)elayed

[math]\displaystyle{ ^a }[/math] or fast_ctd or similar if such records are included

Optional Metadata

Parameter Name	Description
fft_length_sec	seconds
diss_length_sec	seconds
overlap_sec	(for diss_length_sec) seconds
f_AA	Hz, the anti-aliasing frequency.
FOM_limit	non-dimensional, if absent the FOM QC-flag is not set. Typically, 1.15.
diss_ratio_limit	non-dimensional, if absent the dissipation ration QC-flag is not set. Typically, 2.77.
despike_shear_fraction_limit	non-dimensional, if absent the de-spike fraction QC-flag is not set. Typically, 0.05.
despike_shear_iterations_limit	non-dimensional, if absent the de-spike iteration passes QC-flag is not set. Typically 8.
variance_resolved_limit	threshold for the minimum percent of variance resolved in a shear spectrum. Typically 50%.
spectral_model	e.g., Nasmyth, Lueck or Panchev-Kesich
spectrum_std	statistical uncertainty (standard deviation) of the natural logarithm of spectrum of shear
num_vibration_goodman	number of vibration or acceleration time series used to clean the shear spectrum
f_limit	upper limit to exclude frequencies that have contaminations. Typically infinity.
fit_2_isr	dissipation threshold to use the method of fitting to the inertial subrange. Typically 10-5 W/kg.
eps_remove_top_meters	if applicable, upper meters removed from dissipation estimates (e.g., because of ship)
area	e.g., Arctic Ocean, Barents Sea
geospatial_lat_min	latitude minimum of data
geospatial_lat_max	latitude maximum of data
geospatial_lon_min	longitude minimum of data
geospatial_lon_max	longitude maximum of data
geospatial_vertical_min	0
geospatial_vertical_max	in m
geospatial_vertical_positive	down, up
time_coverage_start	yyyy-mm-ddTHH:MM:SSZ
time_coverage_end	yyyy-mm-ddTHH:MM:SSZ
institution	e.g. University of Bergen
principal_investigator	Name of Principal Investigator
authors	Names of authors
contact	email address of corresponding author (usually principal investigator)
project_name	name of project for which the data was collected
cruise	name of cruise from which the data was collected
vessel	name of vessel from which the data was collected
source	From the SeaVoX Platform Categories vocabulary (L06) list, e.g. “subsurface mooring”, ”ship”, ""sub-surface gliders"", ""autonomous underwater vehicle"" (CF)
references	key references
keywords	relevant keywords describing data e.g. shear probes
creator_name	name of person who generated the file
creator_email	email address of person who generated the file
creator_url	website address of the creator
acknowledgement	acknowledgements for this data. e.g. this could include crew of ship or funders
station_name	name of station

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