5 , a positive trend in Ro , which is statistically significant at 99% confidence level, is found over the period 1961–1990 (0.004 yr −1 ), indicating that the orographic enhancement of precipitation in the Alpine region has increased from 1.20 ± 0.01 to 1.31 ± 0.01 in 30 years.
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Variability of orographic enhancement of precipitation in the Alpine region.
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