Potential impact of all-sky assimilation of visible and infrared satellite observations compared with radar reflectivity for convective-scale numerical weather prediction

Lukas Kugler (Corresponding author), Jeffrey L. Anderson, Martin Weissmann

Publications: Contribution to journalArticlePeer Reviewed

Abstract

Although cloud-affected satellite observations are heavily used for nowcasting applications, their use in regional data assimilation is very limited despite possible benefits for convective-scale forecasts. In this article, we estimate the potential impact of assimilating cloud-affected satellite observations of visible (0.6 (Formula presented.) m) and near thermal infrared wavelengths (6.2 and 7.3 (Formula presented.) m) relative to the impact of assimilating radar reflectivity observations. We employed observing-system simulation experiments with a perfect-model forecast for two cases of strong convective summertime precipitation. Observations are simulated using the radiative transfer model RTTOV/MFASIS and assimilated by the ensemble adjustment Kalman filter in the Data Assimilation Research Testbed. The Weather Research and Forecasting model at 2-km grid resolution was used for forecasts. Results show that satellite observations can be nearly as beneficial as three-dimensional radar reflectivity observations. Under favorable conditions, where the prior contains no error in the stage of storm development but only in horizontal position and strength, the assimilation of visible observations leads to 88% of the radar impact. Under more difficult conditions, the impact of visible and infrared observations still reached 50 and 79%, respectively.

Original languageEnglish
Pages (from-to)3623-3644
Number of pages22
JournalQuarterly Journal of the Royal Meteorological Society
Volume149
Issue number757
DOIs
Publication statusPublished - 1 Oct 2023

Austrian Fields of Science 2012

  • 105206 Meteorology

Keywords

  • all-sky assimilation
  • convective-scale data assimilation
  • DART
  • data assimilation
  • infrared radiance
  • life cycle
  • radar reflectivity
  • visible reflectance
  • WRF

Cite this