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Dataset

 

Met Office LIDARNET Wittering Vaisala CL31 ceilometer cloud base and backscatter data

Update Frequency: Daily
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2017-09-12
Download Stats: last 12 months

Abstract

Cloud base and backscatter data from the Met Office's Vaisala CL31 ceilometer located at Wittering, Sussex. The Met Office's laser cloud base recorders network (LCBRs), or ceilometers, returns a range of products for use in forecasting and hazard detection. The backscatter profiles can allow detection of aerosol species such as volcanic ash where suitable instrumentation is deployed. The Vaisala CL31 instrument replaced a Vaisala CT25k instrument previously operated at the site until November 2016.

Citable as:  Met Office (2017): Met Office LIDARNET Wittering Vaisala CL31 ceilometer cloud base and backscatter data. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/e014754be8014e4294c0f5d1a86ce545
Abbreviation: Not defined
Keywords: Met Office, lidar, ceilometer, ash

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Restricted data: please submit an application using the REQUEST ACCESS link for access.
Use of these data is covered by the following licence: http://licences.ceda.ac.uk/image/data_access_condition/ukmo_agreement.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were collected by the Met Office before processed through the Met Office's Hermes system. A copy of these data were then delivered by the Met Office to CEDA for archiving.

File Format:
Data are netCDF formatted

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Instrument/Platform pairings

Met Office: Vaisala CL31 Ceilometer Deployed on: RAF Wittering
Output Description None
  • units: degrees
  • long_name: Angle instrument is offset from vertical
  • var_id: tilt
  • names: Angle instrument is offset from vertical
  • units: m-1 sr-1
  • long_name: Attenuated backscatter coefficient
  • var_id: beta
  • names: Attenuated backscatter coefficient
  • units: mV
  • var_id: background
  • long_name: Background light, millivolts at internal ADC input
  • names: Background light, millivolts at internal ADC input
  • var_id: beta_raw
  • long_name: Backscatter
  • units: (100000 km sr)-1
  • names: Backscatter
  • long_name: Decimal days since Jan. 1, 4713 B.C.E. 12:00:00 +00:00
  • var_id: record
  • names: Decimal days since Jan. 1, 4713 B.C.E. 12:00:00 +00:00
  • units: km
  • long_name: Height of cloudbases
  • var_id: CBH
  • names: Height of cloudbases
  • units: km
  • long_name: Highest signal detected
  • var_id: highest_signal_detected
  • names: Highest signal detected
  • units: nm
  • var_id: wavelength
  • long_name: LCBR wavelength
  • names: LCBR wavelength
  • units: %
  • long_name: Laser pulse energy, % of nominal factory setting
  • var_id: pulse_energy
  • names: Laser pulse energy, % of nominal factory setting
  • units: J
  • long_name: Nominal laser pulse energy
  • var_id: nominal_pulse_energy
  • names: Nominal laser pulse energy
  • long_name: Range to the centre of each range gate
  • var_id: range
  • units: km
  • names: Range to the centre of each range gate
  • long_name: Scale factor to be applied to attenuated backscatter for forecaster display purposes only
  • var_id: display_scaler
  • names: Scale factor to be applied to attenuated backscatter for forecaster display purposes only
  • long_name: System messages
  • var_id: messages
  • names: System messages
  • var_id: message_bits
  • long_name: System messages still encoded as a 48bit unsigned int
  • names: System messages still encoded as a 48bit unsigned int
  • units: km
  • var_id: visibility
  • long_name: Visibility in air
  • names: Visibility in air
  • units: %
  • long_name: Window transmission estimate % (0 ... 100)
  • var_id: window_tau
  • names: Window transmission estimate % (0 ... 100)
  • units: m
  • standard_name: altitude
  • var_id: altitude
  • long_name: height of ground level above mean sea level
  • names: altitude, height of ground level above mean sea level

Co-ordinate Variables

  • standard_name: time
  • var_id: time
  • long_name: Decimal hours from midnight UTC to the end of the measurement period
  • names: time, Decimal hours from midnight UTC to the end of the measurement period
  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • var_id: longitude
  • long_name: longitude
  • names: longitude
Coverage
Temporal Range
Start time:
2017-08-30T07:00:00
End time:
Ongoing
Geographic Extent

 
52.6170°
 
-0.4830°
 
-0.4830°
 
52.6170°
 
Related parties
Authors (1)