A talaj hidrofizikai tulajdonságainak hatása a konvektív csapadékra

Translated title of the contribution: Effect of soil hydrophysical properties on convective precipitation

Hajnalka Breuer, Ferenc Ács, Kálmán Rajkai, Ákos Horváth

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The aim of the present study was to analyze the effect of soil hydrophysical parameters on the simulated spatial distribution of convective precipitation. The hydrophysical parameters were derived from two different soil databases: USDA and HUNSODA. Three other soil effects were also considered: the effect of the parameterization of field capacity and wilting point, and the effect of the spatial distribution of soil moisture content in a grid cell. Simulations of eight heavy precipitation events were carried out with the MM5 numerical weather prediction system, coupled with the Noah land-surface model. The simulated precipitation distributions were compared with interpolated rain-gauge measurements. There was no systematic pattern in the simulated precipitation fields with respect to different soil effects. The precipitation amounts obtained for different simulations changed only insignificantly when summed over the whole model domain. Nevertheless, on the meso-scale a shift in the precipitation fields of the order of 50 km was common, which caused a precipitation difference of up to ±30 mm/day locally. Soil database differences had the greatest effect on convective precipitation. In this case, differences in ETS (Equitable Threat Score) skill scores reached 25%, while according to the Spearman correlation method the simulations were significant at the p = 0.02 level. Among the other effects, the wilting point parameterization effect was the strongest. In this case, the ETS differences were about 20%, while the difference between the measured and simulated precipitation field was significant at the p = 0.11 level. The weakest sensitivity was obtained for the effect of field capacity parameterization.

Original languageHungarian
Pages (from-to)309-324
Number of pages16
JournalAgrokemia es Talajtan
Volume60
Issue number2
DOIs
Publication statusPublished - Dec 1 2011

    Fingerprint

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Soil Science

Cite this