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Arctic Cloud Summer Expedition (ACSE): carbon dioxide and water vapour measurements from the University of Leeds LI-COR Li-7500 gas analyzer on board Icebreaker Oden

Update Frequency: Not Planned
Latest Data Update: 2018-03-21
Status: Final
Online Status: ONLINE
Publication State: Citable
Publication Date: 2018-04-14
Download Stats: last 12 months
Dataset Size: 1.82K Files | 9GB


This dataset contains carbon dioxide and water vapour concentration measurements from the University of Leeds' LI-COR LI-7500 open path gas analyser mounted on board the Swedish Icebreaker Oden durning Arctic Cloud Summer Expedition (ACSE). ACSE took place in the Arctic during summer 2014. These measurements were used to complement a suite of other observations taken during the cruise. Those of the UK contribution, as well as selected other data, are available within the associated data collection in the Centre for Environmental Data Analysis (CEDA) archives. Other cruise data may be available in the NOAA ACSE and The Bolin Centre for Climate Research SWERUS (SWEdish-Russian-US) holdings - see online resources linked to this record.

The instrument's sensing head was located on the foremast of Icebreaker Oden, approximately 1 m forward of the sonic anemometer. Note the LiCOR LI-7500 CO2 data are generally not suitable for flux measurements at sea. Only the water vapour signal has been used for flux analysis.

Data times were truncated to match those from the sonic anemometer and the internal lag was corrected for.

Users should also note that the instrument's temperature and pressure measurements are made inside the interface box. Temperature is thus likely to be high due to solar heating of box, and pressure will be biased low (box is ~3 m below sensor) and may be subject to dynamic pressure fluctuations resulting from airflow around pressure inlet.

Measurements are made at 20 Hz frequency.

The Arctic Cloud Summer Expedition (ACSE) was a collaboration between the University of Leeds, the University of Stockholm, and NOAA-CIRES. ACSE aimed to study the response of Arctic boundary layer cloud to changes in surface conditions in the Arctic Ocean as a working package of the larger Swedish-Russian-US Investigation of Climate, Cryosphere and Carbon interaction (SWERUS-C3) Expedition in Summer 2014. This expedition was a core component to the overall SWERUS-C3 programme and was supported by the Swedish Polar Research Secretariat.

ACSE took place during a 3-month cruise of the Swedish Icebreaker Oden from Tromso, Norway to Barrow, Alaska and back over the summer of 2014. During this cruise ACSE scientists measured surface turbulent exchange, boundary layer structure, and cloud properties. Many of the measurements used remote sensing approaches - radar, lidar, and microwave radiometers - to retrieve vertical profiles of the dynamic and microphysical properties of the lower atmosphere and cloud.

The UK participation of ACSE was funded by the Natural Environment Research Council (NERC, grant: NE/K011820/1) and involved instrumentation from the Atmospheric Measurement Facility of the UK's National Centre for Atmospheric Science (NCAS AMF). This dataset collection contains data mainy from the UK contribution with some additional data from other institutes also archived to complement the suite of meteorological measurements.

Citable as:  Prytherch, J.; Brooks, I.M. (2018): Arctic Cloud Summer Expedition (ACSE): carbon dioxide and water vapour measurements from the University of Leeds LI-COR Li-7500 gas analyzer on board Icebreaker Oden. Centre for Environmental Data Analysis, date of citation. doi:10.5285/a3e0f0848a144484bdea833ef01ec834.
Abbreviation: Not defined
Keywords: CO2, H2O, water vapour, carbon dioxide


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Access to these data is available to any registered CEDA user. Please Login or Register for an account to gain access.
Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were collected, quality controlled and prepared for archiving by the instrument scientists before upload to the Centre for Environmental Data Analysis (CEDA) for long term archiving.

Data Quality:
Data quality were checked by the ACSE project data author before supplying to CEDA. Further information on quality may be available in related documentation.
File Format:
Data are CF-compliant 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


  • long_name: CO2 absorptance
  • units:
  • var_id: CO2ab
  • long_name: CO2 concentration (mmol/m^3)
  • units: mmol/m3
  • var_id: CO2
  • units:
  • var_id: H2Oab
  • long_name: H2O absorptance
  • var_id: H2O
  • units: mmol/m3
  • long_name: H2O concentration (mmol/m^3)
  • var_id: Vcool
  • long_name: cooler signal (Volts)
  • units: V
  • units:
  • var_id: diagnostic
  • long_name: instrument diagnostic code
  • var_id: P
  • long_name: pressure (hPa)
  • units: hPa
  • long_name: temperature (degC)
  • var_id: T
  • units: C
  • var_id: time
  • var_id: doy
  • long_name: time as decimal day of year
  • units: days

Co-ordinate Variables

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