Preprints
https://doi.org/10.5194/acp-2021-404
https://doi.org/10.5194/acp-2021-404

  15 Jun 2021

15 Jun 2021

Review status: this preprint is currently under review for the journal ACP.

Evaluation of modeled summertime convective storms using polarimetric radar observations

Prabhakar Shrestha1, Silke Trömel1,2, Raquel Evaristo1, and Clemens Simmer1 Prabhakar Shrestha et al.
  • 1Institute of Geosciences, Meteorology Department, Bonn University, Germany
  • 2Laboratory for Clouds and Precipitation Exploration, Geoverbund ABC/J, Bonn, Germany

Abstract. Ensemble simulations were conducted for three summertime convective storms over a temperate region in northwestern Germany using the Terrestrial Systems Modeling Platform (TSMP). The simulated microphysical processes were evaluated with polarimetric observations from two X-band radars, with the help of a forward operator applied to the model data. TSMP was found to generally underestimate the convective area fraction, high reflectivities, and the width/magnitude of so-called differential reflectivity (ZDR) columns indicative of updrafts, all leading to an underestimation of the frequency distribution for high precipitation values. The statistical distributions of ZDR and specific differential phase (KDP) were however similar, while the cross-correlation coefficient (phv) was poorly simulated, probably due to little variability of assumed hydrometeor shapes and orientations in the forward operator. The observed model bias in the ZDR columns could be associated with small size of supercooled raindrops and poorly resolved three dimensional flow at km-scale simulations, besides the treatment of freezing process in the model, which warrants further research.

Prabhakar Shrestha et al.

Status: open (until 21 Aug 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Prabhakar Shrestha et al.

Prabhakar Shrestha et al.

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Short summary
The study makes use of ensemble numerical simulations with forward operator to evaluate the simulated cloud and precipitation processes with radar observations. While, comparing model data with radar has its own challenges due to errors in the forward operator and processed radar measurements, the model was generally found to underestimate the high reflectivity, width/magnitude (value) of ZDR columns and high precipitation.
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