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Article Type:
Research Article

On the Potential Impact of Irrigated Areas in North America on Summer Rainfall Caused by Large-Scale Systems

M. SegalAgricultural Meteorology, Department of Agronomy, Iowa State University, Ames, Iowa

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Z. PanAgricultural Meteorology, Department of Agronomy, Iowa State University, Ames, Iowa

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R. W. TurnerDepartment of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa

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E. S. TakleDepartment of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa

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Print Publication:
01 Mar 1998
DOI:
https://doi.org/10.1175/1520-0450-37.3.325
Page(s):
325–331
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Abstract

The potential impact of the increase in irrigated areas in North America during the past 100 years on summer rainfall associated with medium- to large-scale precipitation systems is evaluated conceptually and by several illustrative numerical model simulations. The model results for the simulated cases suggest a tendency toward some increase in the continental-average rainfall for the present irrigation conditions compared with those of past irrigation. The maximum increase obtained for several studied cases of 6-day duration each was 1.7%. Rainfall increases typically occur in the location of existing rainfall areas, and the main effect of irrigation is to redistribute rainfall in those preexisting precipitation regions.

Corresponding author address: Moti Segal, Agricultural Meteorology, Department of Agronomy, Iowa State University, 3010 Agronomy, Ames, IA 50011-1010.

segal@iastate.edu

Abstract

The potential impact of the increase in irrigated areas in North America during the past 100 years on summer rainfall associated with medium- to large-scale precipitation systems is evaluated conceptually and by several illustrative numerical model simulations. The model results for the simulated cases suggest a tendency toward some increase in the continental-average rainfall for the present irrigation conditions compared with those of past irrigation. The maximum increase obtained for several studied cases of 6-day duration each was 1.7%. Rainfall increases typically occur in the location of existing rainfall areas, and the main effect of irrigation is to redistribute rainfall in those preexisting precipitation regions.

Corresponding author address: Moti Segal, Agricultural Meteorology, Department of Agronomy, Iowa State University, 3010 Agronomy, Ames, IA 50011-1010.

segal@iastate.edu

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