Dataset
Met Office LIDARNET Aberporth Jenoptik CHM15k Nimbus ceilometer cloud base and backscatter data
Update Frequency: Daily
Latest Data Update: 2023-06-19
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2015-07-28
Download Stats: last 12 months
Dataset Size: 250.37K Files | 118GB
Abstract
Cloud base and backscatter data from the Met Office's Jenoptik CHM15k Nimbus ceilometer located at Aberporth, mid-Wales. 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 Aberporth Jenoptik CHM15k Nimbus ceilometer cloud base and backscatter data. Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/be641b2f6b524b4a90e61bbb396d5b81
Abbreviation: Not defined
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: |
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: Lufft CHM15k Nimbus Ceilometer | Deployed on: RAF Aberporth |
| Output Description | None |
- units: m-1 sr-1
- long_name: Attenuated backscatter coefficient
- var_id: beta
- names: Attenuated backscatter coefficient
- units: m-1 sr-1
- long_name: Attenuated backscatter coefficient - high resolution mode
- var_id: beta_hr
- names: Attenuated backscatter coefficient - high resolution mode
- units: m-1 sr-1
- long_name: Attenuated backscatter coefficient error
- var_id: beta_error
- names: Attenuated backscatter coefficient error
- units: m-1 sr-1
- long_name: Attenuated backscatter coefficient error - high resolution mode
- var_id: beta_error_hr
- names: Attenuated backscatter coefficient error - high resolution mode
- units: ms
- long_name: Average time per profile
- var_id: average_time
- names: Average time per profile
- var_id: beta_raw
- long_name: Backscatter
- names: Backscatter
- units: oktas
- long_name: Base cloud cover
- var_id: BCC
- names: Base cloud cover
- long_name: Calibration factor applied in attenuated backscatter coefficient calculation
- var_id: calibration_factor
- names: Calibration factor applied in attenuated backscatter coefficient calculation
- units: km
- long_name: Cloud base height variation (STD)
- var_id: CBE
- names: Cloud base height variation (STD)
- units: m
- var_id: CDP
- long_name: Cloud depth
- names: Cloud depth
- units: m
- long_name: Cloud depth variation
- var_id: CDE
- names: Cloud depth variation
- units: m
- long_name: Cloud height offset
- var_id: CHO
- names: Cloud height offset
- 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: nm
- var_id: wavelength
- long_name: LCBR wavelength
- names: LCBR wavelength
- var_id: azimuth
- long_name: Laser direction of site
- units: degree-clockwise
- names: Laser direction of site
- units: m
- long_name: Maximum detection height
- var_id: MXD
- names: Maximum detection height
- units: J
- long_name: Nominal laser pulse energy
- var_id: nominal_pulse_energy
- names: Nominal laser pulse energy
- long_name: Number of laser pulses for each profile
- var_id: npulses
- names: Number of laser pulses for each profile
- long_name: Overlap function
- var_id: overlap
- names: Overlap function
- long_name: Overlap function - high resolution mode
- var_id: overlap_hr
- names: Overlap function - high resolution mode
- long_name: Quality score for aerosol Layer in PBL
- var_id: PBS
- names: Quality score for aerosol Layer in PBL
- 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
- units: km
- long_name: Range from instrument to top of boundary layer
- var_id: PBL
- names: Range from instrument to top of boundary layer
- 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: km
- long_name: Range to the centre of each range gate in high resolution mode
- var_id: range_hr
- names: Range to the centre of each range gate in high resolution mode
- 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: Sky Condition Index
- var_id: SCI
- names: Sky Condition Index
- long_name: System messages encoded as a 31bit unsigned int
- var_id: message_bits
- names: System messages encoded as a 31bit unsigned int
- long_name: Total cloud cover
- var_id: TCC
- units: oktas
- names: Total cloud cover
- units: km
- var_id: visibility
- long_name: Visibility in air
- names: Visibility in air
- units: km
- long_name: Visibility in air error (STD).
- var_id: visibility_error
- names: Visibility in air error (STD).
- 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:
2015-07-13T08:45:00
End time:
Ongoing
Geographic Extent
52.1147° |
||
-4.5594° |
-4.5594° |
|
52.1147° |
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