Particle size and velocity distributions from an OTT Parsivel optical disdrometer located at Mario Zucchelli Station, aggregated to 5min, monthly netCDF archive

Disdrometric data from an OTT Parsivel with 32 size classes and 32 velocity classes located at Mario Zucchelli Station (Antarctica, -74.6945 N, 164.1152 E, 15 m a.s.l.). Mid values and widths of the classes are provided. Spectra are sampled every 5 minutes (after merging five 1-minute measurements) and saved in monthly netCDF files. Note that this data has been processed regardless of precipitation type. Particle Size distribution (PSD) is calculated for every data entry. Monthly cumulated spectra and PSD are also provided.

Metadata available at https://antarcticdatacenter.cnr.it/geonetwork/srv/api/records/ed6ea5bf-3f59-467b-9914-f4db387bb55d

Example of netCDF file structure:

Source:

output/DIS/dis_202202.nc

Format:

netcdf4_classic

Global Attributes:

title = 'OTT Parsivel disdrometer data, aggregated to 5min, monthly netCDF archive.'

comment = 'Particle counts diveded in 32 size classes and 32 velocity classes. Note that this data has been processed regardless of precipitation type.'

time_label = 'Feb 2022'

institution = 'CNR-ISAC, Rome (IT)'

contact_person = 'Baldini Luca, CNR-ISAC, Rome, l.baldini@isac.cnr.it'

source = 'OTT Parsivel disdrometer at MZS (Antarctica)'

location = 'Mario Zucchelli Station (74°42'S, 164°07'E, 15 m a.s.l.)'

author = 'Roversi Giacomo'

creation_date = '05-May-2023 10:46:02 UTC'

coverage = 'Monthly coverage (Feb 2022): 100 %'

time_resolution = '5 minutes'

history = 'Created from raw OTT telegram, aggregated to 5min temporal resolution with a sum of the 1-minute counts if least 3 out of 5 are not NaN.'

Dimensions:

time = 8058 (UNLIMITED)

diameter = 32

velocity = 32

Variables:

time_UTC

Size: 8058x1

Dimensions: time

Datatype: int32

Attributes:

description = 'Measurement time. Timestamp indicates the end of the observation interval, e.g. 01-Mar-2020 00:05:00 represents the particle counts registered between 01-Mar-2020 00:00:01 and 01-Mar-2020 00:05:00.'

time_zone = 'UTC'

units = 'Seconds since 1970-01-01 00:00:00 (Unix time).'

diameters

Size: 32x1

Dimensions: diameter

Datatype: single

Attributes:

description = 'Mid values of the size classes'

units = 'mm'

velocities

Size: 32x1

Dimensions: velocity

Datatype: single

Attributes:

description = 'Mid values of the velocity classes'

units = 'm s^-1'

diameters_width

Size: 32x1

Dimensions: diameter

Datatype: single

Attributes:

description = 'Width of the size classes'

units = 'mm'

velocities_width

Size: 32x1

Dimensions: velocity

Datatype: single

Attributes:

description = 'Width of the velocity classes'

units = 'm s^-1'

spectrum

Size: 32x32x8058

Dimensions: diameter,velocity,time

Datatype: int32

Attributes:

description = 'Matrix of particle counts in each of the 32 diameter sizes and 32 velocity ranges over 5 minutes.'

units = 'counts'

PSD

Size: 32x8058

Dimensions: diameter,time

Datatype: single

Attributes:

description = 'Particle size distribution, 5 minutes interval, normalized by the observed volume.'

units = 'm^-3 mm^-1'

monthlySpectrum

Size: 32x32

Dimensions: diameter,velocity

Datatype: double

Attributes:

description = 'Matrix of particle counts in each of the 32 diameter sizes and 32 velocity ranges over the entire month.'

units = 'counts'

monthlyPSD

Size: 32x1

Dimensions: diameter

Datatype: double

Attributes:

description = 'Particle size distribution for the whole month, normalized by the observed volume.'

units = 'm^-3 mm^-1'