Updated world map of the Köppen-Geiger climate classification

Updated world map of the Köppen-Geiger climate classification

2007 | M. C. Peel, B. L. Finlayson, T. A. McMahon
The article presents an updated world map of the Köppen-Geiger climate classification, based on long-term monthly precipitation and temperature station data. The map is constructed using a two-dimensional thin-plate spline with tension to interpolate climatic variables between stations, resulting in a 0.1°×0.1° grid for each continent. The authors discuss issues related to sites that do not uniquely fit into one climate type and assess the outcomes on a continental basis. Globally, the most common climate type by land area is BWh (Hot desert, 14.2%), followed by Aw (Tropical savannah, 11.5%). The updated map is freely available electronically and is compared with recent gridded data-based maps, highlighting its advantages in terms of resolution and handling of sites with multiple climate types. The methodology and results are discussed, and the limitations of the current system are noted, particularly in high-latitude regions. The authors suggest that future revisions may need to focus on improving the criteria for selecting the second letter of the C and D climates.The article presents an updated world map of the Köppen-Geiger climate classification, based on long-term monthly precipitation and temperature station data. The map is constructed using a two-dimensional thin-plate spline with tension to interpolate climatic variables between stations, resulting in a 0.1°×0.1° grid for each continent. The authors discuss issues related to sites that do not uniquely fit into one climate type and assess the outcomes on a continental basis. Globally, the most common climate type by land area is BWh (Hot desert, 14.2%), followed by Aw (Tropical savannah, 11.5%). The updated map is freely available electronically and is compared with recent gridded data-based maps, highlighting its advantages in terms of resolution and handling of sites with multiple climate types. The methodology and results are discussed, and the limitations of the current system are noted, particularly in high-latitude regions. The authors suggest that future revisions may need to focus on improving the criteria for selecting the second letter of the C and D climates.
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