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Considerations for the use of radar-derived precipitation estimates in determining return intervals for extreme
 

Summary: Considerations for the use of radar-derived precipitation
estimates in determining return intervals for extreme
areal precipitation amounts
Robert J. Allena
, Arthur T. DeGaetanob,
*
a
Department of Geology and Geophysics, Yale University, New Haven, CT, USA
b
Northeast Regional Climate Center, Department of Earth and Atmospheric Science, 1119 Bradfield Hall,
Cornell University, Ithaca, NY 14853, USA
Received 13 February 2004; revised 24 March 2005; accepted 31 March 2005
Abstract
To explore the feasibility of radar-based extreme precipitation climatologies, prototype radar areal reduction factor (ARF)
curves are developed and compared to those based on traditional rain gauge networks. For both the radar and gauge data,
increasing the spatial density of observations has little influence on the ARF relationship. However, independently,
considerable differences between radar ARF and gauge ARF exist. Radar ARF decays at a faster rate (with increasing area) than
gauge ARF. For a basin size of 20,000 km2
, the percent difference between radar ARF and gauge ARF ranges from 11 to 32%.
This implies that radar-derived estimates of extreme point precipitation are disproportionately larger than radar-derived

  

Source: Allen, Robert J. - Department of Earth Sciences, University of California at Riverside

 

Collections: Geosciences; Environmental Sciences and Ecology