Global Annual Average Climate Moisture Index (CMI)

Jul 1, 2010
Description:
This dataset depicts annual average climate moisture index (CMI, Willmott and Feddema, 1992) computed using the ratio of annual precipitation (P) to annual potential evapotranspiration, (PET).al., 2004. Climate Moisture Index (CMI) indicator for the globe on a 0.5 X 0.5 degree global grid. The CMI illustrates the relationship between plant water demand and available precipitation. The CMI indicator ranges from -1 to +1, with wet climates showing positive CMI, and dry climates negative CMI.

Climate Moisture Index (CMI) = (P / PET) -1 when P < PET OR
Climate Moisture Index (CMI) = 1- (PET / P) when P = PET

P = long term annual precipitation (mm/yr) computed from Mitchell et al. (2003) PET = potential evapotranspiration (mm/yr) estimated using the physically-based function of Shuttleworth and Wallace (1985).
Data Provided By:
Vorosmarty,C. J.,Water Systems Analysis Group,University of New Hampshire, NH
Content date:
not specified
Citation:
Title: Global Annual Average Climate Moisture Index (CMI)
Credits: Vorosmarty,C. J.,Water Systems Analysis Group,University of New Hampshire, NH
Publication Date: 2005
Other Citation Info: Vorosmarty, C. J., E. M. Douglas, P.A. Green and C. Revenga (2005), Geospatial indicators of emerging water stress: An application to Africa, Ambio, 34(3), 230 - 236. Prof. Geographer 44: 84-87.
Contact Organization:
Water Systems Analysis Group, Complex System Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, USA
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Use Constraints:
Reference Vorosmarty et. al., 2005
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