TU Delft optical disdrometer Parsivel² PAR001 at Cabauw

From Ruisdael Observatory Data Catalog
Dataset: TU Delft optical disdrometer Parsivel² PAR001 at Cabauw
title TU Delft Parsivel² disdrometer at Cabauw (PAR001)
description Description: In-situ measurements of raindrop size distributions, fall velocities, drop number concentrations and surface rain rates recorded by a Parsivel2 optical disdrometer named "PAR001_Cabauw", placed at the remote sensing site in Cabauw in the Netherlands.

This dataset is part of a larger collection of datasets published by the Dept. of Geoscience and Remote Sensing (GRS) at TU Delft within the framework of the Ruisdael Observatory (https://ruisdael-observatory.nl/).

The Parsivel2 optical disdrometer, manufactured by OTT Hydromet, is a widely used precipitation sensor which measures the size and velocity of raindrops as they pass through a horizontal laser beam. These measurements are aggregated over fixed intervals (typically 60 seconds) to produce a matrix of drop counts across 32 size and velocity classes, which is then used to approximate the raindrop size distribution (DSD) per unit volume of air. At the Ruisdael observatory, all Parsivel2 disdrometers are operated with a temporal sampling resolution of 60 seconds.

List of variables:

  • latitude, longitude and altitude of measurement site
  • time (in UTC), both in numeric and text format
  • rainfall intensity
  • weather codes (synop 4677, synop 4680, metar 4678, NWS)
  • meteorological optical range in precipitation
  • radar reflectivity
  • number of hydrometeors per minute at the surface, grouped according to 32 diameter and 32 velocity classes
  • number concentrations of raindrop sizes (for 32 diameter classes), per unit volume of air
  • total number of detected hydrometeors per minute
  • kinetic energy of hydrometeors
  • laser amplitude and laser status
  • internal temperature of sensor
Keywords DSD, Cabauw, Disdrometer, Parsivel, Precipitation, Rain, Raindrop size distribution
type See Dataset Types' descriptions in Dataset type taxon descriptions In-situ Observation
format netCDF
served by data service Cloudnet, 4TU.ResearchData
landing page https://opendap.4tu.nl/thredds/catalog/data2/Ruisdael/continuous monitoring/optical disdrometer/ott parsivel2/PAR001 Cabauw/catalog.html
PID https://doi.org/10.4121/7f3cbf43-c2a2-4db4-8a55-d5ca0ee3abec.v4
license CC BY 4.0
contact person Marc Schleiss
creator Marc Schleiss
organization TU Delft


Geographic and Temporal Information
location Cabauw
geographic coordinates 51.968317 N, 4.929234 E
elevation (meters) 11 m <br />
start date 2021-10-01
end date 2030-01-01
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Note: "PAR001_Cabauw" is next to another identical OTT Parsivel2 disdrometer named "PAR002_Cabauw". The Cabauw site also features two other optical disdrometers of a different brand (Thies Clima) named "Thies001_Cabauw" and "Thies005_Cabauw", as well as a third OTT Parsivel2 disdrometer named "PAR007_Cabauw_Tower" in the Cabauw tower at a height of 180 meters. The large number of co-located sensors can be used to cross-check data, apply quality control and/or assess measurement uncertainty due to sensor calibration, random sampling effects and environmental effects such as wind speed/direction which are known to substantially affect the accuracy of optical disdrometers.

Known issues:

Please note: The temperature readings from the Parsivel2 do not represent actual air temperatures. These sensors are intended primarily to monitor internal conditions near the sensor heads and circuit board. Their accuracy tends to degrade over time, and in some cases the sensors may become faulty, producing unrealistically large temperature values.

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