This page contains the documentation for the TYN CY 2.0 data-set, and comprises:
10th February 2003
1. A table is available, accessible via 'Data' on the left frame, that summarises the full range of data-sets available.
2. A new country-by-country climate data-set has been added, presenting information on modelled climate changes during the 21st century. See TYN CY 3.0.
The Climatic Research Unit and the Tyndall Centre are currently re-organising the dissemination of data-sets. As part of this re-organisation, related data-sets are being labelled under a consistent scheme of acronyms. We urge users of these data-sets to use these acronyms wherever possible, to enable the data-sets that they have used to be identified clearly and unambiguously. This data-set is now labelled TYN CY 2.0.
19th August 2002
1. A page has been added giving examples of published academic work that uses the country climate data-sets. I welcome the opportunity to add details of your work (see the page for details)!
2. I have added an electronic version of the paper describing the observed country climate data, which was published in a peer-reviewed journal called Area.
23rd May 2002
Data-set released giving an indication of future climate changes for individual countries. This new data-set has not yet been approved by the IPCC-DDC; therefore it does not constitute part of the IPCC-DDC website, nor is it recommended for use by the IPCC-DDC, unlike the observed data in TYN CL 1.0.
The data set described here provides a summary of some of the possible changes in climate that may be experienced during the 21st century in 289 countries and territories.
The purposes for
which this data-set are relevant differ from the purposes of the observed data-set
The primary purpose here is to permit an assessment to be made of the plausible
extent of climate change over the 21st century, driven by anthropogenic emissions
of greenhouse gases and sulphur dioxide. It is reasonable to do this at the
spatial scale of individual countries because the spatial scales at which climate
change may occur (as measured here) are much larger than the spatial scales
of the climate itself (as measured in the observed data-set.)
However, a number of caveats should be noted.
All users of this data-set ought to reflect upon a number of limitations to this data-set:
The information is available for each country in two forms: as a graphic file (.pdf) and as a data file (.txt). These files are presented in a table, with the data files ordered alphabetically by country.
To make it easier to combine this data-set with the observed data-set in trans-boundary studies, the same data-set is also available with all the countries in consolidated files, presented in a different table.
The author bears no responsibility for the accuracy of the data set. The countries listed below include a variety of sovereign states, dependent territories, and disputed territories. No political statement is being made by the inclusion or exclusion of a particular territory, or by the labelling of a particular territory by a particular name.
The original data were provided to Dr. Richard Jones (Hadley Centre) on each model's native grid. Dr. Jones regridded the data to a common grid (144 cells longitudinally, 73 cells latitudinally). This author then regridded the data onto a 0.5 degree grid. We then used the allocation of grid cells to individual countries developed for the observed data (see below) to aggregate grid cells into countries.
The method of allocating countries was as follows. We assigned each box to a single country. For each country we calculated the weighted mean of the values from its constituent grid boxes for each month in turn. Each grid box was weighted by surface area, using the cosine of the latitude. For further information see the paper published in Area (electronic version here).
The nine climate models used here are the set of models used by the IPCC (2001) in the Third Assessment Working Group 1 Report. Further details about the individual models may be obtained from that report (Tables 8.1 and 9.1).
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