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The variables were calculated from the Climate Hydrology and Ecology research Support System meteorology dataset for Great Britain (1961-2019) [CHESS-met] gridded observed meteorological data at 1 km resolution.  The units kg m-2 d-1 are equivalent to mm d-1. The data are provided in gridded NetCDF files. There is one file for each variable, for each calendar month.","distributionFormats":[{"name":"NetCDF","type":"application/netcdf","version":"4"}],"distributorContacts":[{"organisationName":"NERC EDS Environmental Information Data Centre","organisationIdentifier":"https://ror.org/04xw4m193","role":"distributor","email":"info@eidc.ac.uk"}],"funding":[{"funderName":"Natural Environment Research Council","funderIdentifier":"https://ror.org/02b5d8509","awardNumber":"NE/S017380/1","awardURI":"https://gtr.ukri.org/projects?ref=NE/S017380/1","orcid":false,"ror":true}],"id":"bcec9c33-f863-464e-ac28-73b981bd40a4","incomingCitationCount":0,"infoLinks":[{"url":"https://data-package.ceh.ac.uk/sd/bcec9c33-f863-464e-ac28-73b981bd40a4.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"inspireThemes":[{"theme":"Environmental Monitoring Facilities","uri":"http://inspire.ec.europa.eu/theme/ef"}],"keywordsOther":[{"value":"hydrology","uri":"http://www.eionet.europa.eu/gemet/concept/4118"},{"value":"modelling","uri":"http://www.eionet.europa.eu/gemet/concept/5327"},{"value":"evapotranspiration","uri":"http://www.eionet.europa.eu/gemet/concept/3022"},{"value":"evaporation","uri":"http://www.eionet.europa.eu/gemet/concept/3019"},{"value":"potential evaporation"},{"value":"potential evaptranspiration"}],"keywordsProject":[{"value":"Climate Hydrology and Ecology Research Support System (CHESS)"}],"keywordsTheme":[{"value":"Hydrology","uri":"http://onto.nerc.ac.uk/CEHMD/topic/9"}],"licences":[{"value":"This resource is available under the terms of the Open Government Licence","code":"license","uri":"https://eidc.ac.uk/licences/ogl/plain"}],"lineage":"This dataset was derived from the Climate Hydrology and Ecology research Support System meteorology dataset for Great Britain (1961-2019) [CHESS-met] at 1 km resolution over the United Kingdom for the years 1961-2019. The daily total potential evapotranspiration (PET; kg m-2 d-1) was calculated using the Penman-Monteith equation parameterised for a well-watered grass surface. The daily total potential evapotranspiration with interception correction (PETI; kg m-2 d-1), was calculated as PET then a correction added for interception by a grass canopy on days with non-zero precipitation. \n\nThe CHESS-met meteorological variables used were daily mean air temperature at 1.2 m (K), specific humidity at 1.2 m(kg kg-1), surface air pressure (Pa), downward longwave radiation (W m-2), downward shortwave radiation (W m-2), monthly mean wind speed at 10 m (m s-1) and precipitation (kg m-2 s-1). A description of the methodology is available in the supporting documentation.","metadataDate":"2026-06-29T18:23:45","notGEMINI":false,"onlineResources":[{"url":"https://catalogue.ceh.ac.uk/datastore/eidchub/bcec9c33-f863-464e-ac28-73b981bd40a4","name":"Download the data","description":"Download a copy of this data","function":"fileAccess","type":"OTHER"},{"url":"https://data-package.ceh.ac.uk/sd/bcec9c33-f863-464e-ac28-73b981bd40a4.zip","name":"Supporting information","description":"Supporting information available to assist in re-use of this dataset","function":"information","type":"OTHER"}],"pointsOfContact":[{"familyName":"Robinson","givenName":"Emma","organisationName":"UK Centre for Ecology & Hydrology","organisationIdentifier":"https://ror.org/00pggkr55","role":"pointOfContact","email":"enquiries@ceh.ac.uk","nameIdentifier":"https://orcid.org/0000-0002-3746-4517","address":{"deliveryPoint":"Maclean Building, Benson Lane, Crowmarsh 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