9dace73ad8654298aea626b8bde0a782 English 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 dataset Centre for Environmental Data Analysis (CEDA) 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk pointOfContact 2026-04-30T02:17:59 UK GEMINI 2.3 WGS 84 Optimised global monthly mean surface flux of ethane (2008-2014) produced using the INVICAT 4D-Var inverse model 2018-06-01T15:23:36 publication 2018-06-01T15:23:36 creation https://catalogue.ceda.ac.uk/uuid/9dace73ad8654298aea626b8bde0a782 9dace73ad8654298aea626b8bde0a782 Centre for Environmental Data Analysis (CEDA) http://dx.doi.org/10.5285/9dace73ad8654298aea626b8bde0a782 doi 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. Wilson, Chris Unavailable author Unavailable author Monks, Sarah A Unavailable author Unavailable author Emmons, Louisa K. Unavailable author Unavailable author Hannigan, James Unavailable author Unavailable author Helmig, Detlev Unavailable author Unavailable author Blake, Nicola J. Unavailable author Unavailable author Blake, Donald R. Unavailable author Unavailable author Centre for Environmental Data Analysis (CEDA) custodian 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk custodian Centre for Environmental Data Analysis (CEDA) distributor 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk distributor Centre for Environmental Data Analysis (CEDA) point_of_contact 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk pointofContact Centre for Environmental Data Analysis (CEDA) publisher 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk publisher notPlanned dataset Not defined atmospheric conditions theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication otherRestrictions Public data: access to these data is available to both registered and non-registered users. otherRestrictions Under the following licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/, appropriate use of these data may fall under any 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. grid English climatologyMeteorologyAtmosphere -180.0 180.0 -90.0 90.0 2008-01-15T00:00:00 2014-12-15T23:59:59 NetCDF Centre for Environmental Data Analysis (CEDA) Data Center Contact 01235446432 Rutherford Appleton Laboratory Harwell Oxon OX11 0QX United Kingdom support@ceda.ac.uk distributor https://catalogue.ceda.ac.uk/uuid/9dace73ad8654298aea626b8bde0a782 CEDA Data Catalogue Page Detail and access information for the resource information http://data.ceda.ac.uk/badc/deposited2018/invicat/data DOWNLOAD Download Data download http://data.ceda.ac.uk/badc/deposited2018/invicat/doc/INVICAT_ethane_0814_userinfo.pdf Use documentation No further details. information 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 No further details. information dataset 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 2010-12-08 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.