| Dataset Title |
Global Geospatial Aridity Index (UNEP 1997) |
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| Abstract |
Global-Aridity as one grid layer representing the annual average over the 1950-2000 period within the countries of Angola, Botswana and Namibia. The Global-Aridity is modelled using the data available from the
WorldClim Global Climate Data (Hijmans et al. 2005) as input parameters. The WorldClim,
based on a high number of climate observations and SRTM topographical data, is a high-
resolution global geo-database (30 arc seconds or ~ 1km at equator) of monthly average data
(1950-2000) for the following climatic parameters: precipitation, mean, minimum and maximum
temperature. This set of parameters is insufficient to fully parameterize physical radiation-based
PET equations (i.e. the FAO-PM), though can parameterize simpler temperature-based PET
equations. Note: In the Global-Aridity dataset, following this formulation, Aridity Index values increase for
more humid conditions, and decrease with more arid conditions. The Global-Aridity surface shows moisture availability for potential growth of
reference vegetation excluding the specific impact of soil condition to adsorb and hold water.
UNEP (UNEP 1997) breaks up Aridity Index, in the traditional classification scheme presented. For datailed information see attached PDF - File (Global_Aridity_and_Global_PET_Methology_1). |
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| Citation |
Zomer RJ, Trabucco A, Bossio DA, van Straaten O, Verchot LV, 2008. Climate Change Mitigation: A Spatial Analysis of Global Land Suitability for Clean Development Mechanism Afforestation and Reforestation. Agric. Ecosystems and Envir. 126: 67-80.
Zomer RJ, Bossio DA, Trabucco A, Yuanjie L, Gupta DC & Singh VP, 2007. Trees and Water: Smallholder Agroforestry on Irrigated Lands in Northern India. Colombo, Sri Lanka: International Water Management Institute. pp 45. (IWMI Research Report 122). |
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| Topic Category |
climatologyMeteorologyAtmosphere |
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