A convective‐scale 1,000‐member ensemble simulation and potential applications
- Author(s)
- Tobias Necker, Stefan Geiss, Martin Weissmann, Juan Ruiz , Takemasa Miyoshi, Guo‐Yuan Lien
- Abstract
This study presents the first convective‐scale 1,000‐member ensemble simulation over central Europe, which provides a unique data set for various applications. A comparison with the operational regional 40‐member ensemble of Deutscher Wetterdienst shows that the 1,000‐member simulation exhibits realistic spread properties overall. Based on this, we discuss two potential applications. First, we quantify the sampling error of spatial covariances of smaller subsets compared with the 1,000‐member simulation. Knowledge about sampling errors and their dependence on ensemble size is crucial for ensemble and hybrid data assimilation and for developing better approaches for localization in this context. Secondly, we present an approach for estimating the relative potential impact of different observable quantities using ensemble sensitivity analysis. This will provide the basis for consecutive studies developing future observation and data assimilation strategies. Sensitivity studies on the ensemble size indicate that about 200 ensemble members are required to estimate the potential impact of observable quantities with respect to precipitation forecasts.
- Organisation(s)
- Department of Meteorology and Geophysics
- External organisation(s)
- Hans Ertel Centre for Weather Research, Centro de Investigaciones del Mar y la Atmosfera, CIME/CONICET‐UBA, Ulmer Fundamental Symmetries Laboratory, Central Weather Bureau, Taiwan
- Journal
- Quarterly Journal of the Royal Meteorological Society
- Volume
- 146
- Pages
- 1423-1442
- No. of pages
- 20
- ISSN
- 0035-9009
- DOI
- https://doi.org/10.1002/qj.3744
- Publication date
- 04-2020
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105206 Meteorology
- Keywords
- ASJC Scopus subject areas
- Atmospheric Science
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/a-convectivescale-1000member-ensemble-simulation-and-potential-applications(318e78b5-5bd7-480c-962b-de15d785bbc3).html