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

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Attibute Name	Description	Convention
title	A comprehensive title for the dataset including the time and location aspect	CF, ACDD
authors	A list of authors	ATOMIX
summary	An abstract describing the dataset	ACCD
comment	Supplementary technical details about the collecting and processing of the dataset	CF, ACDD
platform_type	The platform from which the data are collected, e.g., sub-surface mooring, research vessel, sub-surface glider	ACDD
source	The instrument used for collecting the data. For example, vertical microstructure profiler, VMP2000 SN009	CF, ACDD
date_created	The date on which the data were created, yyyy-mm-ddTHH:MM:SSZ	ACDD
date_modified	The date on which the data were last modified, yyyy-mm-ddTHH:MM:SSZ	ACDD
time_reference_year	Year for time reference	ATOMIX
time_coverage_start	Time of the first data point in the dataset, yyyy-mm-ddTHH:MM:SSZ	ACDD
time_coverage_end	Time of thelast data point in the dataset, yyyy-mm-ddTHH:MM:SSZ	ACDD
geospatial_lat_min	Southern bound of data, decimal degrees, negative for South	ACDD
geospatial_lat_max	Northern bound of data, decimal degrees, negative for South	ACDD
geospatial_lon_min	Western bound of data, decimal degrees, negative for West	ACDD
geospatial_lon_max	Eastern bound of data, decimal degrees, negative for West	ACDD
fs_fast	Sampling frequency for fast (turbulence) channels	ATOMIX
fs_slow [math]\displaystyle{ ^a }[/math]	Sampling frequency for slow channels (if exists). Alternative names could be, e.g., fs_CTD	ATOMIX
profiling_direction	Direction along which the section was collected, e.g., horizontal, vertical, or glide	ATOMIX
fft_length	Length of the Fast Fourier transform segments (in data points; note, fft_lengths_sec in seconds is optional)	ATOMIX
diss_length	Length of data (in data points) used for each dissipation estimate	ATOMIX
overlap	Length of overlap (in data points) in diss_length	ATOMIX
goodman	Flag for the vibration coherent noise removal using the Goodman algorithm. 0=not applied; 1=applied	ATOMIX
HP_cut	The high-pass filter cutoff frequency in Hz. Can be zero for no filtering.	ATOMIX
conventions	A comma-separated list of the conventions that are followed by the dataset. e.g., CF-1.6, ACDD-1.3, ATOMIX	CF, ACDD
history	Provides an audit trail for modifications to the original data; e.g., Version 1	CF, ACDD

It is highly recommended to duplicate relevant attributes at the corresponding group level. Attributes not listed in the Climate and Forecast (CF) and the Attribute Convention for Data Discovery (ACDD) standards are labeled as ATOMIX.

Optional Metadata

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Attribute Name	Description	Convention
fft_length_sec	Length of the Fast Fourier transform segments in seconds	ATOMIX
diss_length_sec	Dissipation estimate data length in seconds	ATOMIX
overlap_sec	Length of overlap (in seconds) in diss_length_sec	ATOMIX
f_AA	The anti-aliasing frequency in Hz	ATOMIX
FOM_limit	Figure of merit limit for quality assurance. Typically between 1.15 and 1.4.	ATOMIX
diss_ratio_limit	The limit to identify anomalously large disagreement between dissipation estimates from probes. The magnitude of the difference of the natural logarithm of two dissipation estimates should be smaller than diss_ratio_limit [math]\displaystyle{ \times \sigma_{\ln \varepsilon} }[/math]. Typically, 2.77.	ATOMIX
despike_shear_fraction_limit	The maximum allowed fraction of data (of each diss_length_sec length) removed by de-spiking. Typically, 0.05.	ATOMIX
despike_shear_iterations_limit	The maximum number of allowed iterations of de-spiking when producing the L2 shear probe data (one value per section). Typically 8.	ATOMIX
variance_resolved_limit	The minimum fraction of variance resolved in an estimate by spectral integration. Typically 0.6.	ATOMIX
f_limit	The upper limit to exclude frequencies from analysis. Typically infinity.	ATOMIX
fit_2_isr	Dissipation threshold for using the method of fitting in the inertial subrange. Typically [math]\displaystyle{ 10^{−5} }[/math] W kg[math]\displaystyle{ ^{−1} }[/math]	ATOMIX
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
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_vertical_min	0
geospatial_vertical_max	in m
geospatial_vertical_positive	down, up
institution	e.g. University of Bergen
principal_investigator	Name of Principal Investigator
contact	email address of corresponding author (usually principal investigator)
project	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
license	the URL to a standard or specific license, e.g, http://creativecommons.org/licenses/by/4.0/, Freely Distributed, or None

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