IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 1: Extremes and Variability : Observed relationships between extreme sub-daily rainfall, surface temperature and relative humidity
Observed relationships between extreme sub-daily rainfall, surface temperature and relative humidity
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Expected changes to future extreme precipitation remain a key uncertainty associated with anthropogenic climate change. Recently, extreme precipitation has been proposed to scale with the precipitable water content in the atmosphere, which assuming relative humidity stays constant, will increase at a rate of ∼6.8%/C as indicated by the Clausius‐ Clapeyron (C‐C) relationship. We examine this scaling empirically using data from 137 long‐record pluviograph and temperature gauges across Australia. We find that scaling rates are consistent with the C‐C relationship for surface temperatures up to between 20C and 26C and for precipitation durations up to 30 minutes, implying that such scaling applies only for individual storm systems. At greater temperatures negative scaling is observed. Consideration of relative humidity data shows a pronounced decrease in the maximum relative humidity for land surface temperatures greater than 26C, indicating that moisture availability becomes the dominant driver of how extreme precipitation scales at higher temperatures.
File Size : 640,247 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 1: Extremes and Variability
Date Published : 01/07/2011
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