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UKCP18 Exploratory Extended Time-mean Sea Level Projections around the UK for 2007-2300

Update Frequency: As Needed
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2018-11-26
Download Stats: last 12 months


The UKCP18 exploratory extended time-mean sea level projections are provided as spatially a continuous dataset around the UK coastline for the period 2007-2300. These exploratory projections have been devised to be used seamlessly with the UKCP18 21st Century projections and provide very similar values for the period up to 2100. Users should be aware that post-2100 projections have a far greater degree of uncertainty than the 21st Century projections, and should therefore be treated as illustrative of the potential future changes. Note in particular than we cannot currently rule out substantially larger sea level rise in the coming centuries than is represented in the projections presented here. The data consist of annual time series of the projected change in the time-mean coastal water level relative to the average value for the period 1981-2000. Projections are available for the RCP2.6, RCP4.5 and RCP8.5 climate change scenarios (Meinshausen et al, 2011). As with the 21st Century projections, a lower, central and upper estimate of the projected sea level change is provided based on process-based model uncertainty. However, users should view these uncertainties with a much lower degree of confidence for the period post-2100.

Citable as:  Met Office Hadley Centre (2018): UKCP18 Exploratory Extended Time-mean Sea Level Projections around the UK for 2007-2300. Centre for Environmental Data Analysis, date of citation.
Abbreviation: Not defined
Keywords: Not defined


Previous Info:
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Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
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:

Data provided by the UK Met Office

File Format:
Data are NetCDF formatted

Process overview

This dataset was generated by the computation detailed below.
Title UKCP18 exploratory extended regional time-mean sea level projections
Abstract The UKCP18 exploratory regional time-mean sea level projections are based on a two-layer energy balance model (e.g. Gregory et al, 2015) fit to individual CMIP5 climate models. This model framework is used to provide extended projections of global thermal expansion and global average surface temperature (GST) change to 2300. Global contributions from ice sheet surface mass balance and glaciers are related to GST following methods described in IPCC AR5 WG1 Chapter 13 (Church et al, 2013). Global sea level contributions for dynamic ice discharge for Greenland and Antarctica are based on extrapolation of IPCC AR5 projections to 2100 and the modelling work of Levermann et al (2014), respectively. Estimates of land water storage changes follow those reported in IPCC AR5 for the 21st Century extrapolated to 2300. These global components are regionalised for the UK through use of: (i) sea level fingerprints for mass components provided by Aimee Slangen and Giorgio Spada; (ii) regression relationships around the UK and across CMIP5 models for the oceanographic component; (iii) an ensemble of estimates of the relative sea level change from glacial isostatic adjustment from the NERC BRITICE_CHRONO project. Please refer to UKCP18 documentation for detailed methods.
Input Description None
Output Description None
Software Reference None
  • units: m
  • long_name: Local time-mean relative sea level anomaly
  • var_id: seaLevelAnom
  • names: Local time-mean relative sea level anomaly
  • var_id: percentile
  • long_name: percentile
  • names: percentile

Co-ordinate Variables

  • standard_name: time
  • var_id: time
  • long_name: Time
  • names: time, Time
  • units: degrees_north
  • standard_name: latitude
  • var_id: latitude
  • names: latitude
  • units: degrees_east
  • standard_name: longitude
  • var_id: longitude
  • names: longitude
Temporal Range
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Geographic Extent