Erica Betts - Urban Induced Precipitation Changes...

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    Urban Induced Precipitation  Changes: Implications for Regional Planning Erica Betts April 24, 2008
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    Scientists vs. Planners Scientists Producers of scientific knowledge Planners Linking knowledge to action
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    Urbanization – Climate Feedbacks Urban Heat Island (UHI) Land use changes – climate feedbacks Surface albedo changes Changes in latent vs. sensible heat flux Boundary layer changes due to building height Coceal and Belcher – urban canopy modeling efforts Precipitation changes Urban areas cause surface winds to decrease under significant synoptic flow and increase under weak synoptic flow due to surface roughness
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    Implications/Importance Urban areas account for less than 2% of the Earth’s land surface Feedbacks more a local and regional issue rather than global More than 50% of the Earth’s population lives in these urbanized areas
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    Various scales linking urban environments to the environmental system [modified after Oke ( 1987)] urban canopy layer (UCL) urban boundary layer (UBL).
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    Urban-Induced Precipitation  Changes Long held realization that change from naturally vegetated to urban environments results in temperature changes Precipitation changes have been witnessed as well but harder to analyze until later part of this century Many questions remain concerning what factors/mechanisms drive these precipitation changes and/or their relative importance.
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  Shepherd, J. M., et al. (2002), Rainfall Modification by Major Urban Areas: Observations from Spaceborne Rain Radar on the TRMM Satellite, Journal of Applied Meteorology, 41 , 689-701. 19.5% increase in precipitation
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This note was uploaded on 11/07/2011 for the course EAS 8803 taught by Professor Staff during the Spring '08 term at Georgia Tech.

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Erica Betts - Urban Induced Precipitation Changes...

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