NERC Data Catalogue Service
20 and 30 year climatologies from CMIP3 climate model output as used in the 2007 IPCC Fourth Assessment Report (AR4)
Climatology data used in Climate Change 2007, the Fourth Assessment Report (AR4) of the United Nations Intergovernmental Panel on Climate Change (IPCC) calculated from Coupled Model Intercomparison Project Phase 3 (CMIP3) model output.
Simulations of global climate models were run by various climate modelling groups coordinated by the World Climate Research Programme (WCRP) on behalf of the IPCC.
Climatology data was calculated from global climate model simulations of experiments representative of Special Report on Emission Scenarios (SRES) scenarios: A1b, A2, B1, the commitment scenario experiment (COMMIT), the twentieth century experiment (20C3M), the pre-industrial control (PICTL) and the idealised experiments 1PCTO2X and 1PCTO4X.
The AR4 climatologies are 20-year period averages. 30-year period averages have also been calculated for comparison with the IPCC Third Assessment Report (TAR). The monthly climatology data covers the period from 1850-2100. The climatologies are of global scope and are provided on latitude-longitude grids.
The period averages are:
20x: 20-year averages [+20-39, +46-65, +80-99, +180-199] as used in chapter 10 of IPCC 2007,
30a: 30-year averages [+01-30, +31-60, +61-90] as used in the observed climatologies,
30b: 30-year averages [+10-39, +40-69, +70-99] for compatibility with the IPCC 3rd Assessment Report (TAR).
The climatology period averages listed above are relative to AD2000 for SRES scenarios A1B, A2, B1, and the commitment scenario COMMIT, relative to AD1900 for the twentieth century run (20C3M) and relative to the start of the experiment for the pre-industrial control (PICTL) and the 1PCTO2X and 1PCTO4X runs.
Data files are 'tar' files with names of the form [model]_[experiment]_[variable]_{climatology}.tar.
The experiments in this dataset include the SRES future scenarios:
A1B Globalisation with rapid economic growth,
A2 Regionalisation with regionally oriented economic development,
B1 Globalisation with global environmental sustainability.
Also:
COMMIT simulation of climate change we are committed to given the current loading of greenhouse gasses and zero future emissions.
PICTL the pre-industrial control.
20C3M the 20th century climate simulaiton.
1PTO2X and 1PTO4X idealised simulaitons where the concentration of atmospheric carbon dioxide (CO2) is increased by 1 percent per year from pre-industrial concentration until reaching 2x and 4x the original concentration.
The dataset is comprised of monthly mean surface data for the following atmospheric variables:
specific humidity,
precipitation flux,
air pressure at sea level,
surface downwelling shortwave flux in air,
air temperature,
air temperature daily max,
air temperature daily min,
eastward wind,
northward wind.
Default
Identification info
- Metadata Language
- English (en)
- Dataset Reference Date ()
- 2021-06-01T20:39:47
- Dataset Reference Date ()
- 2021-06-01T20:39:47
- Identifier
- Centre for Environmental Data Analysis (CEDA) / e6edf4076e7e42f681f495ccf0ec22cb
- Maintenance and update frequency
- unknown
- Update scope
- dataset
- Keywords
-
- IPCC
- DDC
- AR4
- CMIP3
- SRES
- COMMIT
- PICTL
- 20C3M
- 1PCTO2X
- 1PCTO4X
- Climate Change
- GEMET - INSPIRE themes, version 1.0 ()
-
- atmospheric conditions
- Limitations on Public Access
- otherRestrictions
- Other constraints
- Public data: access to these data is available to both registered and non-registered users.
- Use constraints
- otherRestrictions
- Spatial representation type
- grid
- Topic category
-
- Climatology, meteorology, atmosphere
))
- Begin date
- 1850-01-01T00:00:00
- End date
- 2100-12-31T23:59:59
- Code
- WGS 84
Distribution Information
- Data format
-
-
netcdf
()
-
netcdf
()
- Resource Locator
-
CEDA Data Catalogue Page
Detail and access information for the resource
- Resource Locator
-
DOWNLOAD
Download Data
- Resource Locator
-
CMIP3 Climate Model Documentation
No further details.
- Resource Locator
-
Special Report on Emission Scenarios (SRES)
No further details.
- Resource Locator
-
Climate Change 2007, the Fourth Assessment Report (AR4) of the United Nations Intergovernmental Panel on Climate Change (IPCC)
No further details.
- Resource Locator
-
CEDA Data Catalogue Page
Detail and access information for the resource
- Resource Locator
-
DOWNLOAD
Download Data
- Resource Locator
-
CMIP3 Climate Model Documentation
No further details.
- Resource Locator
-
Special Report on Emission Scenarios (SRES)
No further details.
- Resource Locator
-
Climate Change 2007, the Fourth Assessment Report (AR4) of the United Nations Intergovernmental Panel on Climate Change (IPCC)
No further details.
- Quality Scope
- dataset
Report
- Dataset Reference Date ()
- 2010-12-08
- Statement
- Climatology data calculated from global climate model simulations for a variety of experiments from the Coupled Model Intercomparison Project Phase 3 (CMIP3).
Metadata
- File identifier
- e6edf4076e7e42f681f495ccf0ec22cb XML
- Metadata Language
- English (en)
- Character set
- 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646
- Parent identifier
- Model output described in the 2007 IPCC Fourth Assessment Report (AR4), 20 and 30 year climatologies 3a9c171d7f1c4441ba8ffb9c2c22b81e
- Resource type
- dataset
- Metadata Date
- 2023-05-19T00:27:46
- Metadata standard name
- UK GEMINI
- Metadata standard version
- 2.3
