Dataset
Met Office LIDARNET Northolt Vaisala CT25k ceilometer cloud base and backscatter data
Update Frequency: Not Planned
Latest Data Update: 2016-10-07
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2015-07-28
Download Stats: last 12 months
Dataset Size: 10.67K Files | 4GB
Abstract
Cloud base and backscatter data from the Met Office's Vaisala Ct25k ceilometer located at RAF Northolt, near Heathrow, southern England. 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.
Citable as: Met Office (2015): Met Office LIDARNET Northolt Vaisala CT25k ceilometer cloud base and backscatter data. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/b1e2f90ef234469fa313b4fc3630581e/
Abbreviation: metoffice-vaisala-ct25k-ceilometer_northolt
Keywords: Met Office, lidar, ceilometer, ash
Details
| Previous Info: |
No news update for this record
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|---|---|
| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
These data have multiple licences for different applications. Always make sure to read the appropriate licence for full data usage limitations details. Other usage may not be permitted.
Restricted data: please submit an application using the REQUEST ACCESS link for access. Use of these data is covered by the following licence(s): https://artefacts.ceda.ac.uk/licences/specific_licences/ukmo_agreement.pdf https://artefacts.ceda.ac.uk/licences/specific_licences/ukmo_agreement_gov.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
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Process overview
This dataset was generated by instruments deployed on platforms as listed below.
Instrument/Platform pairings
| Met Office: Vaisala CT25k Ceilometer | Deployed on: RAF Northolt, UK |
| 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: (10000 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
- var_id: range
- units: km
- long_name: Range from antenna to the centre of each range gate
- names: Range from antenna to the centre of each range gate
- long_name: Range to the centre of each range gate
- var_id: range
- units: km
- names: Range to the centre of each range gate
- units: %
- long_name: Receiver sensitivity as a percentage of nominal factory setting
- var_id: receiver_sensitivity
- names: Receiver sensitivity as a percentage of nominal factory setting
- 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 32bit unsigned int
- names: System messages still encoded as a 32bit unsigned int
- units: km
- var_id: visibility
- long_name: Visibility in air
- names: Visibility in air
- 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:
2015-07-13T08:00:15
End time:
2016-10-05T06:00:00
Geographic Extent
51.5500° |
||
-0.4170° |
-0.4170° |
|
51.5500° |
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