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Dataset

 

Eyjafjallajokull Volcanic Ash Cloud: backscatter profiles from the Met Office's Lidars at the Chilbolton and Herstmonceux sites, UK

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2014-09-19
Download Stats: last 12 months

Abstract

The Icelandic Volcano, Eyjafjallajokull, started erupting on 14th April 2010. The volcanic ash cloud produced covered much of Northern Europe for several weeks causing extensive disruption to air travel. The UK and European atmospheric communities had many instruments - both airborne and ground-based, remote sensing and in-situ - taking measurements of the ash cloud throughout this period. This dataset contains backscatter profiles from the Met Office's Lidars at the Chilbolton and Herstmonceux sites, UK.

Citable as:  Met Office (2014): Eyjafjallajokull Volcanic Ash Cloud: backscatter profiles from the Met Office's Lidars at the Chilbolton and Herstmonceux sites, UK. NCAS British Atmospheric Data Centre, date of citation. https://catalogue.ceda.ac.uk/uuid/fe3508b4a3d44ae0ad032921f4165596
Abbreviation: Not defined
Keywords: Eyjafjallajokull, Lidar, Met Office

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 collected by the Met Office's lidar network. A copy of these data were made available to the British Atmospheric Data Centre (BADC) to assist the academic community during this volcanic ash event.

Data Quality:
This is quick look unvetted data.
File Format:
Data are netCDf formatted

Related Documents

No documents related to this record were found.

Process overview

This dataset was generated by instruments deployed on platforms as listed below.
Output Description None
  • long_name: 31 Bit ServiceCode
  • var_id: error_ext
  • names: 31 Bit ServiceCode
  • units: m-1 sr-1
  • long_name: Attenuated backscatter coefficient
  • var_id: beta
  • names: Attenuated backscatter coefficient
  • units: AU
  • long_name: Attenuated raw photon count
  • var_id: beta_raw
  • names: Attenuated raw photon count
  • units: ms
  • long_name: Average time per profile
  • var_id: average_time
  • names: Average time per profile
  • var_id: base
  • units: counts
  • long_name: Daylight correction factor, photons per shot
  • names: Daylight correction factor, photons per shot
  • long_name: Lidar wavelength
  • units: nm
  • var_id: wavelength
  • names: Lidar wavelength
  • units: NAN
  • long_name: NN1
  • var_id: NN1
  • names: NN1
  • 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: Range from antenna to the centre of each range gate
  • units: km
  • var_id: range
  • names: Range from antenna to the centre of each range gate
  • var_id: base1
  • long_name: Range from instrument to first cloud base
  • units: km
  • names: Range from instrument to first cloud base
  • var_id: base2
  • long_name: Range from instrument to second cloud base
  • units: km
  • names: Range from instrument to second cloud base
  • var_id: base3
  • long_name: Range from instrument to third cloud base
  • units: km
  • names: Range from instrument to third cloud base
  • 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: Standard Deviation raw signal, photons/ shot
  • var_id: stddev
  • units: counts
  • names: Standard Deviation raw signal, photons/ shot
  • units: m
  • var_id: altitude
  • long_name: altitude of ceilometer above mean sea level
  • names: altitude of ceilometer above mean sea level
  • units: ms
  • var_id: average_time
  • long_name: average time per record
  • names: average time per record
  • long_name: detector temperature in K*10
  • var_id: temp_det
  • units: K
  • names: detector temperature in K*10
  • long_name: external temperature in K*10
  • var_id: temp_ext
  • units: K
  • names: external temperature in K*10
  • units: Laser fife time
  • long_name: h
  • var_id: life_time
  • names: h
  • 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
  • var_id: temp_int
  • units: K
  • long_name: internal temperature in K*10
  • names: internal temperature in K*10
  • units: unitless
  • var_id: state_laser
  • long_name: laser quality index - 255 max
  • names: laser quality index - 255 max
  • long_name: laser wavelength
  • units: nm
  • var_id: wavelength
  • names: laser wavelength
  • var_id: latitude
  • long_name: latitude of site
  • units: degrees_north
  • names: latitude of site
  • units: m
  • long_name: length of range gate, binwidth
  • var_id: range_gate
  • names: length of range gate, binwidth
  • var_id: beta_raw
  • units: counts
  • long_name: lidar backscatter raw data 1064 nm, photons per shot & noise
  • names: lidar backscatter raw data 1064 nm, photons per shot & noise
  • long_name: longitude of site
  • units: degrees_east
  • var_id: longitude
  • names: longitude of site
  • units: unitless
  • var_id: laser_pulses
  • long_name: number of laser pulses averaged per record
  • names: number of laser pulses averaged per record
  • units: unitless
  • long_name: quality of detector signal - 255 max
  • var_id: state_detector
  • names: quality of detector signal - 255 max
  • units: m
  • long_name: range from lidar to the bottom of each range gate
  • var_id: range
  • names: range from lidar to the bottom of each range gate
  • long_name: time UTC
  • var_id: time
  • names: time UTC
  • var_id: state_optics
  • units: unitless
  • long_name: transmission of optics
  • names: transmission of optics

Co-ordinate Variables

  • long_name: Decimal hours from midnight UTC to the middle of each ray
  • var_id: time
  • standard_name: time
  • names: time, Decimal hours from midnight UTC to the middle of each ray
  • standard_name: latitude
  • var_id: latitude
  • long_name: latitude
  • units: degrees_north
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • long_name: longitude
  • var_id: longitude
  • names: longitude
Coverage
Temporal Range
Start time:
2010-04-09T23:00:00
End time:
2010-08-29T23:00:00
Geographic Extent

 
51.1450°
 
-1.4270°
 
0.3165°
 
50.8910°
 
Related parties
Authors (1)