Chapter
Apr 26, 2012
Downscaling Climate Projections: A Method to Tackle Spatial and Temporal Variability Associated with Quasi-Periodic Signals and First Two Statistical Moments
Authors: Julio Cañón [email protected], Francina Domínguez [email protected], and Juan Valdés [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
In this paper we introduce a statistical downscaling method that incorporates the spatial and temporal variability associated with quasi-periodic climate signals, such as ENSO, by using Multichannel Singular Spectrum Analysis (M-SSA). In addition, the method preserves the expected values and variances of downscaled climate variables. The lump value of a climate variable is dissagregated over a grid of higher spatial resolution by using time series projections calculated on a cell-by-cell basis. To do this, we use a stochastic model consisting of the sum of the mean value, a quasi-periodic component related to climate signals, and a random component associated with the residual variance of historic records. The technique is employed to downscale standardized precipitation values, from historic records and projections of coupled climate models, taking into account the variability associated with ENSO.
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© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Analysis (by type)
- Climate change
- Climates
- Construction engineering
- Construction management
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Geometry
- Grid systems
- Mathematics
- Moment (mechanics)
- Project management
- Spatial analysis
- Spatial variability
- Statics (mechanics)
- Statistics
- Systems engineering
- Systems management
Authors
Affiliations
Department of Hydrology and Water Resources/SAHRA, The University of Arizona, 85721 Email: [email protected] and Grupo GAIA, Universidad de Antioquia, Colombia. E-mail: [email protected]
Department of Hydrology and Water Resources, The University of Arizona, 85721. E-mail: [email protected]
F.ASCE
Department of Civil Engineering and Engineering Mechanics/SAHRA, University of Arizona, 85721. E-mail: [email protected]
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