Kilometer-scale multi-physics simulations of heavy precipitation events in Northeast China
OPEN ACCESS
Author / Producer
Date
2024-09
Publication Type
Journal Article
ETH Bibliography
no
Citations
Altmetric
OPEN ACCESS
Data
Abstract
Despite the fatal impact of heavy precipitation on people’s lives and the social economy, its accurate estimating remains challenging. In this study, we show how to address this issue by kilometer-scale simulations and how to reduce computational costs in Northeast China with the complex terrain and distribution of land and sea. Three typical heavy precipitation events are simulated at 3 km horizontal resolution, and each event is simulated with 24 combinations of schemes (with or without a scale-aware cumulus scheme, three microphysics schemes, and four planetary boundary layer schemes), which are evaluated against gauge observations. Compared to gauge observations, the ensemble mean of simulations of hourly maximum precipitation and average accumulated precipitation outperforms three widely accepted satellite products in the cold vortex and the snowstorm case, and is of comparable accuracy in the typhoon case. Overall, the microphysics scheme significantly impacts the maximum hourly precipitation, whereas the planetary boundary layer scheme has a strong control over the accumulated precipitation. The similarity among different simulations is linked to the level of convective instability's impact on heavy precipitation in each case, which also indicates that conducting 24 simulations can be not necessary. This study uses an ensemble performance estimation technique assuming the impact of different schemes is additive and finds that performing 13 rather than 24 simulations allows finding the best-performing combination of parameterization schemes, which allows for saving almost 50% of computational costs.
Permanent link
Publication status
published
External links
Editor
Book title
Journal / series
Volume
62 (9)
Pages / Article No.
9207 - 9231
Publisher
Springer
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Kilometer-scale modeling; Rainstorm; Snowstorm; Complex terrain; Physics ensembles
Organisational unit
09844 - Prein, Andreas Franz / Prein, Andreas Franz