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South Asian Monsoon: whole air sample halocarbon measurements onboard FAAM aircraft flights

Update Frequency: Not Planned
Latest Data Update: 2019-04-04
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2019-03-28
Download Stats: last 12 months
Dataset Size: 19 Files | 433KB


This dataset contains halocarbon measurements made from whole air samples collected on board the FAAM (Facility for Airborne Atmospheric Measurements) aircraft during the NERC (National Environmental Research Council) South West Asian Aerosol Monsoon Interactions (SWAAMI) project and the Interaction of Convective Organization and Monsoon Precipitation, Atmosphere, Surface and Sea (INCOMPASS) project - both of which were funded under the 'Drivers of Variability in the South Asian Monsoon' programme.
Whole air samples were collected in 3 L stainless steel cylinders (WAS flasks) aboard the FAAM aircraft during 11 flights (b957, b959, b963, b966, b968, b969, b971, b972, b974, b975, b976). In total, 176 samples were collected above India and the Indian Ocean, from the 12th June - 10th July 2016. Samples were returned to the University of Bristol for analysis by Medusa Gas Chromatography Mass Spectrometry, resulting in concentration (mole fraction) data for chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and chlorocarbons (e.g. dichloromethane). Each sample was analysed three times in total, with the reported mole fraction taken to be the average of these three analyses. Samples were collected by Daniel Say, with significant input from Anita Ganesan (flight planning) and Simon O'Doherty (interpretation of measurements).

Citable as:  Say, D.; Ganesan, A.; O'Doherty, S. (2019): South Asian Monsoon: whole air sample halocarbon measurements onboard FAAM aircraft flights. Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: b957, b959, b963, b966, b968, b969, b971, b972, b974, b975, b976, halocarbons, HCFC, HFC, FAAM, SWAAMI, INCOMPASS, whole air sample, WAS


Previous Info:
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Previously used record identifiers:
No related previous identifiers.
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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:

Flask samples were collected by Daniel Say on board the Facility for Airborne Atmospheric Measurements (FAAM) aircraft. Samples were analysed using a Medusa Gas Chromatography Mass Spectrometry instrument at the University of Bristol. Data were deposited at the Centre for Environmental Data Analysis (CEDA) for archiving.

Data Quality:
Data are as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA).
File Format:
Data are NetCDF formatted.

Related Documents

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Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Mobile platform operations

Mobile Platform Operation 1 FAAM BAE-147 flight B971
Mobile Platform Operation 2 FAAM BAE-147 flight B972
Mobile Platform Operation 3 FAAM BAE-147 flight B974
Mobile Platform Operation 4 FAAM BAE-147 flight B975
Mobile Platform Operation 5 FAAM BAE-147 flight B976
Mobile Platform Operation 6 FAAM BAE-147 flight B957
Mobile Platform Operation 7 FAAM BAE-147 flight B959
Mobile Platform Operation 8 FAAM BAE-147 flight B963
Mobile Platform Operation 9 FAAM BAE-147 flight B966
Mobile Platform Operation 10 FAAM BAE-147 flight B968
Mobile Platform Operation 11 FAAM BAE-147 flight B969
Output Description


  • units: 1e-12
  • long_name: Mole fraction of 1,1,1-trifluoroethane (HFC-143a) in air
  • standard_name: mole_fraction_of_hfc143a_in_air
  • var_id: hfc143a
  • units: 1e-12
  • long_name: Mole fraction of 1,1-difluoroethane (HFC-152a) in air
  • standard_name: mole_fraction_of_hfc152a_in_air
  • var_id: hfc152a
  • units: 1e-12
  • standard_name: mole_fraction_of_chloroform_in_air
  • var_id: chcl3
  • long_name: Mole fraction of chloroform (chcl3) in air
  • units: 1e-12
  • standard_name: mole_fraction_of_dichloromethane_in_air
  • var_id: ch2cl2
  • long_name: Mole fraction of dichloromethane (CH2Cl2) in air
  • units: 1e-12
  • long_name: Mole fraction of difluoromethane (HFC-32) in air
  • standard_name: mole_fraction_of_hfc32_in_air
  • var_id: hfc32
  • units: 1e-12
  • standard_name: mole_fraction_of_pfc318_in_air
  • var_id: pfc318
  • long_name: Mole fraction of octafluorocyclobutane (PFC-318) in air
  • units: 1e-12
  • standard_name: mole_fraction_of_perchloroethene_in_air
  • var_id: pce
  • long_name: Mole fraction of perchloroethene (pce) in air
  • standard_name: mole_fraction_of_cfc11_in_air
  • units: 1e-12
  • var_id: cfc11
  • long_name: Mole fraction of trichlorofluoromethane (CFC-11) in air
  • units: 1e-12
  • long_name: Mole fraction of trifluoromethane (HFC-23) in air
  • standard_name: mole_fraction_of_hfc23_in_air
  • var_id: hfc23
  • units: m
  • standard_name: altitude
  • var_id: altitude

Co-ordinate Variables

  • units: degree_north
  • standard_name: latitude
  • var_id: latitude
  • units: degree_east
  • standard_name: longitude
  • var_id: longitude
  • standard_name: time
  • var_id: time
Temporal Range
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Geographic Extent