BGS Hosted Metadata
Optimised global monthly mean surface flux of ethane (2008-2014) produced using the INVICAT 4D-Var inverse model
This data file contains two sets of optimised global surface fluxes of ethane (C2H6), produced through variational inverse methods using the TOMCAT chemical transport model, and the INVICAT inverse transport model. Emissions were produced using an iterative method of optimisation, known as 4D-Var, which minimised the model-observation differences.
These surface fluxes are produced as monthly mean values on the (approximately) 5.6 degree horizontal model grid. The associated uncertainty for the flux from each gridcell is also included.
The fluxes and uncertainties are global, and cover the period Jan 2008 - Dec 2014.
There are two alternative emissions sets, labelled EMIS_ALL and EMIS_ANTH, whilst the uncertainties are labelled ERROR_ALL and ERROR_ANTH, respectively. The two optimised emission estimates are produced through iterative minimisation of model-observation error in INVICAT. In all cases the observations are surface flask samples of ethane produced by by the National Oceanic and Atmospheric Administration’s Global Monitoring Division (NOAA GMD) and the University of Colorado’s Institute of Arctic and Alpine Research (INSTAAR). Whole air samples in flasks are collected weekly to bi-weekly at each site and C2H6 is measured using gas chromatography with a flame ionization detection method.
The EMIS_ALL fluxes are produced through variation of all surface emission types (anthropogenic, biomass burning, oceanic and biospheric), whilst the EMIS_ANTH fluxes are produced by only allowing the surface anthropogenic emissions to vary, with prior estimates of other emission types then added back on.
Flux and uncertainty units are kg(C2H6)/m2/s, and time units are days since January 1st 2008. These emissions show improved performance relative to independent observations when included in the TOMCAT model. Further details about the data can be found in the PDF documentation stored along side this data, as well as in Monks et al., 2018.
Simple
- Date (Publication)
- 2018-06-01T15:23:36
- Date (Creation)
- 2018-06-01T15:23:36
- Citation identifier
- https://catalogue.ceda.ac.uk/uuid/9dace73ad8654298aea626b8bde0a782
- Citation identifier
- Centre for Environmental Data Analysis (CEDA) / 9dace73ad8654298aea626b8bde0a782
- Citation identifier
- doi / http://dx.doi.org/10.5285/9dace73ad8654298aea626b8bde0a782
- Point of contact
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Organisation name Individual name Electronic mail address Role Unavailable
Wilson, Chris
Unavailable
Author Unavailable
Monks, Sarah A
Unavailable
Author Unavailable
Emmons, Louisa K.
Unavailable
Author Unavailable
Hannigan, James
Unavailable
Author Unavailable
Helmig, Detlev
Unavailable
Author Unavailable
Blake, Nicola J.
Unavailable
Author Unavailable
Blake, Donald R.
Unavailable
Author Centre for Environmental Data Analysis (CEDA)
Custodian Centre for Environmental Data Analysis (CEDA)
Distributor Centre for Environmental Data Analysis (CEDA)
pointofContact Centre for Environmental Data Analysis (CEDA)
Publisher
- Maintenance and update frequency
- Not planned
- Update scope
- Dataset
- Keywords
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Not defined
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GEMET - INSPIRE themes, version 1.0
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atmospheric conditions
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- 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
- Spatial representation type
- Grid
- Language
- English
- Topic category
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- Climatology, meteorology, atmosphere
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- Begin date
- 2008-01-15T00:00:00
- End date
- 2014-12-15T23:59:59
- Unique resource identifier
- WGS 84
- Distribution format
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Name Version NetCDF
- Distributor contact
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Organisation name Individual name Electronic mail address Role Centre for Environmental Data Analysis (CEDA)
Distributor
- OnLine resource
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Protocol Linkage Name https://catalogue.ceda.ac.uk/uuid/9dace73ad8654298aea626b8bde0a782 CEDA Data Catalogue Page
- OnLine resource
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Protocol Linkage Name http://data.ceda.ac.uk/badc/deposited2018/invicat/data DOWNLOAD
- OnLine resource
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Protocol Linkage Name http://data.ceda.ac.uk/badc/deposited2018/invicat/doc/INVICAT_ethane_0814_userinfo.pdf Use documentation
- OnLine resource
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Protocol Linkage Name https://doi.org/10.1029/2017JD028112 Monks, S. A., Wilson, C., Emmons, L. K., Hannigan, J. W., Helmig, D., Blake, N. J., & Blake, D. R. (2018). Using an inverse model to reconcile differences in simulated and observed global ethane concentrations and trends between 2008 and 2014. Journal of Geophysical Research: Atmospheres, 123, 11,262-11,282
- Hierarchy level
- Dataset
Conformance result
- Title
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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
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Produced by C. Wilson using the INVICAT inverse model, developed at the University of Leeds, Leeds, UK. INVICAT is based on the TOMCAT chemical transport model, which was developed by M. P. Chipperfield, also now at the University of Leeds.
Metadata
- File identifier
- 9dace73ad8654298aea626b8bde0a782 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2026-03-11T03:17:43
- Metadata standard name
- UK GEMINI
- Metadata standard version
-
2.3
- Metadata author
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Organisation name Individual name Electronic mail address Role Centre for Environmental Data Analysis (CEDA)
Point of contact
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