Suppressing grid-point storms in a numerical forecasting model

Seung Bu Park, Ji Young Han

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The convective parameterization scheme of the Korean Integrated Model (KIM) is ten-tatively modified to suppress grid-point storms in the Western Pacific Ocean. The KIM v3.2.11 suffers from the numerical problem that grid-point storms degrade forecasts in the tropical oceans and around the Korean Peninsula. Another convective parameterization scheme, the new Tiedtke scheme, is implemented in the KIM. The artificial storms are suppressed in the test version because the heating and drying tendencies of the new Tiedtke scheme are stronger than those of the default KIM Simplified Arakawa-Schubert (KSAS) scheme. Based on this comparison, the KSAS scheme is modified to strengthen its heating and drying tendencies by reducing the entrainment and detrain-ment rates. The modified KSAS scheme suppresses grid-point storms and thus decreases grid-scale precipitation in a summertime case simulation. Twenty 10-day forecasts with the default convection scheme (KSAS) and twenty forecasts with the modified scheme are conducted and compared with each other, confirming that the modified KSAS scheme successfully suppresses grid-point storms.

Original languageEnglish
Article number1194
JournalAtmosphere
Volume12
Issue number9
DOIs
StatePublished - Sep 2021

Keywords

  • Convective parameterization
  • Entrainment and detrainment rates
  • Grid-point storms
  • KIM simplified Arakawa-Schubert scheme
  • Korean Integrated Model
  • New Tiedtke scheme

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