EASOE: Univerisity of College Wales Ozone DIAL LIDAR backscatter measurements at Aberystwyth, UK

The European Arctic Stratospheric Ozone Experiment is a European Commission (EC) measurement campaign undertaken in the Northern Hemisphere winter of 1991-92 to study ozone chemistry and dynamics. The dataset contains measurements of chemical constituents (concentrations of ozone and the members of the chlorine and nitrogen families) and meteorological parameters from European ground stations and balloon and aircraft flights, and from the ground-based ozone monitoring network. This dataset is public.

This dataset was produced using a Nd-YAG laser, 0.6m diameter mirror, two receiver channels - one for parallel and the other for perpendicular polarisation. Photon counting system; raw data collected at 30m resolution (both channels simultaneously). Each individual measurement takes 5 minutes (5000 shots). For the data here, all measurements for an individual evening have been combined. Usually, 2 or 3 consecutive runs were made, but on some evenings (e.g. December 6-9 1991) a large number of profiles were measured. Times of measurements are not given here but can be supplied on request; each was made within 4 hours of 2000 GMT and during hours of darkness. Detailed data for each run are also available on request.

To derive backscatter ratios, atmospheric density profiles were derived from ozonesondes launched from Aberystwyth during EASOE. These were corrected for air and ozone absorption. The top of the aerosol layer for each night was determined by inspection of the counts*height squared (Ch2) profile, and the average ratio of Ch2 to corrected density above this height was used to derive the backscatter ratio.

Correction for aerosol absorption was made using an extinction/backscatter ratio of 40, assumed constant throughout the layer.

For depolarisation ratio, the ratio of the two receiver channels is shown, corrected for the beamsplitter efficiency. Also, all the data have been normalised so that the lidar depolarisation ratio for air (above the aerosol layer) is 1.4%. (Note: this is different from the preliminary data).

Data are shown above 10 km, except where cirrus was present, when the altitudes contaminated by cirrus have been removed. Below 10 km, the count-rates were too high for the recorded data to be reliable. The upper height reported is that of the top of the aerosol layer.

Date (Publication): 2007-02-01T19:33:08

Date (Creation): 2007-02-01T19:33:08

Citation identifier: https://catalogue.ceda.ac.uk/uuid/28c36528dbc84ce3df6f6952b07f9cfe

Citation identifier: NCAS British Atmospheric Data Centre (NCAS BADC) / 28c36528dbc84ce3df6f6952b07f9cfe

Point of contact

Organisation name	Electronic mail address	Role
Norwegian Institute for Air Research (NILU)	unknown	Author
NCAS British Atmospheric Data Centre (NCAS BADC)	badc@rl.ac.uk	Custodian
NCAS British Atmospheric Data Centre (NCAS BADC)	badc@rl.ac.uk	Distributor
unknown	unknown	Principal investigator
NCAS British Atmospheric Data Centre (NCAS BADC)	badc@rl.ac.uk	pointofContact
NCAS British Atmospheric Data Centre (NCAS BADC)	badc@rl.ac.uk	Publisher

Maintenance and update frequency: Not planned

Update scope: Dataset

Keywords

EASOE
ozone
Lidar

GEMET - INSPIRE themes, version 1.0

atmospheric conditions

Access constraints: Other restrictions

Other constraints: Public data: access to these data is available to both registered and non-registered users.

Use constraints: Other restrictions

Other constraints: Under the following licence https://artefacts.ceda.ac.uk/licences/missing_licence.pdf, appropriate use of these data may fall under unstated use. This message is intended as guidance, always read the full licence. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.

Spatial representation type: Grid

Language: English

Topic category

Climatology, meteorology, atmosphere

Begin date: 1991-11-11T00:00:00

End date: 1992-03-29T23:00:00

Unique resource identifier: WGS 84

Distribution format

Name	Version
Data are NASA-Ames formatted

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NCAS British Atmospheric Data Centre (NCAS BADC)		badc@rl.ac.uk	Distributor

OnLine resource

Protocol	Linkage	Name
	https://catalogue.ceda.ac.uk/uuid/28c36528dbc84ce3df6f6952b07f9cfe	CEDA Data Catalogue Page

OnLine resource

Protocol	Linkage	Name
	http://data.ceda.ac.uk/badc/CDs/easoe/data/groundba/lidar/aberystw	DOWNLOAD

Hierarchy level: Dataset

Conformance result

Title: Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

Date (Publication): 2010-12-08

Statement: The final data were supplied to NILU for the whole EASOE campaign and placed on CD-ROM. This CD-Rom was then uploaded as-is into the BADC archive for browsing purposes.

Metadata

File identifier: 28c36528dbc84ce3df6f6952b07f9cfe XML

Metadata language: English

Character set: UTF8

Parent identifier: European Arctic Stratospheric Ozone Experiment (EASOE): Airborne and Ground-Station Measurements of Meteorological Parameters
573d8ec65dd8ae5ee3f779946fbc2497

Hierarchy level: Dataset

Date stamp: 2026-04-16T02:00:39

Metadata standard name: UK GEMINI

Metadata standard version: 2.3

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NCAS British Atmospheric Data Centre (NCAS BADC)		badc@rl.ac.uk	Point of contact

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