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Dataset

 

IASI global monthly averages of effective sulphur dioxide (SO2) column amounts, 2007 - 2014, version 1.0

Update Frequency: Not Planned
Status: Completed
Online Status: ONLINE
Publication State: Published
Publication Date: 2018-03-15
Download Stats: last 12 months

Abstract

This dataset contains global monthly averaged effective sulphur dioxide (SO2) column amounts derived from the Infrared Atmospheric Sounding Interferometer (IASI) instrument on the METOP-A satellite. The data have been produced by the University of Oxford as part of the NERC Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics (COMET).

This dataset has been produced using the Walker et al. (2011, 2012) linear retrieval developed for the Infrared Atmospheric Sounding Interferometer, which is able to detect sulphur dioxide (SO2) gas. This dataset contains monthly averages of this retrieval output from June 2007 to December 2014 across the globe, within which it is possible to identify the period and the location of when we have an anomaly of SO2 in atmosphere. This includes volcanic eruptions alongside non-eruptive volcanic degassing, and human pollution sources.

Within the dataset are the average effective SO2 column amounts in Dobson Units (DU) for 0.125º by 0.125º gridboxes across the globe. Also included for each grid box are the standard deviation, and the number of pixel boxes contributing to the mean. The results from this dataset are discussed in Taylor et al. (2018) 'Exploring the utility of IASI for monitoring volcanic SO2 emissions' in review at JGR: Atmospheres.

Citable as:  Taylor, I.A.; Carboni, E.; Grainger, R.G. (2018): IASI global monthly averages of effective sulphur dioxide (SO2) column amounts, 2007 - 2014, version 1.0. Centre for Environmental Data Analysis, date of citation. doi:10.5285/8eb35b1ab1b2476986d174a2f0231307. http://dx.doi.org/10.5285/8eb35b1ab1b2476986d174a2f0231307
Abbreviation: Not defined
Keywords: IASI, SO2, volcanic emissions, satellite observation, thermal infrared spectra

Details

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: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

These data were produced by the Earth Observation Data Group, Atmospheric, Oceanic and Planetary Physics, University of Oxford, as part of the NERC Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics (COMET). These data were then supplied to CEDA to be archived.

Data Quality:
Data as provided by the Earth Observation Data Group, Atmospheric, Oceanic and Planetary Physics, University of Oxford.
File Format:
Data are in NetCDF format

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

IASI Deployed on: Metop-A

Independent Instruments

IASI

Mobile platform operations

Mobile Platform Operation 1 Mobile Platform Operation for: Metop-A

Computation Element: 1

Title Global sulphur dioxide (SO2) column amounts from the Infrared Atmospheric Sounding Interferometer (IASI)
Abstract The Walker et al. (2011, 2012) linear retrieval developed for the Infrared Atmospheric Sounding Interferometer (IASI) on the Metop satellites has been used to process the IASI Metop-A data to produce an effect SO2 column amount. The linear retrieval output for each orbit has then been averaged for each month to obtain an average effective SO2 column amount in Dobson Units (DU). In this application, the retrieval uses the ν3 absorption band (centred at 7.3 μm) and SO2 was assumed to be evenly distributed between the surface and 20 km. Literature: Taylor et al. (2018) Exploring the utility of IASI for monitoring volcanic SO2 emissions, in review at JGR: Atmospheres. Walker et al. (2011) An effective method for the detection of trace species demonstrated using the MetOp Infrared Atmospheric Sounding Interferometer, Atmospheric Measurement Techniques, 4: 1567-1580, doi:10.5194/amt-4-1567-2011. Walker et al. (2012) Improved detection of sulphur dioxide in volcanic plumes using satellite-based hyperspectral infrared
Input Description None
Output Description None
Software Reference None
Output Description None
  • units: DU
  • var_id: standard_deviation
  • long_name: Effective SO2 Column Amount standard deviation
  • names: Effective SO2 Column Amount standard deviation
  • units: DU
  • long_name: Monthly mean effective SO2 Column Amount assuming SO2 is evenly distributed between 0 and 20 km
  • var_id: so2
  • names: Monthly mean effective SO2 Column Amount assuming SO2 is evenly distributed between 0 and 20 km
  • units: 1
  • long_name: Number of pixel gridboxes used to compute the monthly mean effective SO2 Column Amount
  • var_id: npix
  • names: Number of pixel gridboxes used to compute the monthly mean effective SO2 Column Amount

Co-ordinate Variables

  • 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:
2007-05-31T23:00:00
End time:
2014-12-31T23:59:59
Geographic Extent

 
90.0000°
 
-180.0000°
 
180.0000°
 
-90.0000°