气候变化领域集成服务门户(CCPortal): Evaluation of modelled summertime convective storms using polarimetric radar observations

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DOI	10.5194/acp-22-7593-2022
	Evaluation of modelled summertime convective storms using polarimetric radar observations
	Shrestha, Prabhakar; Troemel, Silke; Evaristo, Raquel; Simmer, Clemens
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	7593
结束页码	7618
卷号	22 期号:11 页码:26
英文摘要	Ensemble simulations with the Terrestrial Systems Modelling Platform (TSMP) covering northwestern Germany are evaluated for three summertime convective storms using polarimetric X-band radar measurements. Using a forward operator, the simulated microphysical processes have been evaluated in radar observation space. Observed differential reflectivity (Z(DR)) columns, which are proxies for updrafts, and multi-variate fingerprints for size sorting and aggregation processes are captured by the model, but co-located specific differential phase (K-DP) columns in observations are not reproduced in the simulations. Also, the simulated Z(DR) columns, generated by only small-sized supercooled drops, show smaller absolute Z(DR) values and a reduced width compared to their observational counterparts, which points to deficiencies in the cloud microphysics scheme as well as the forward operator, which does not have explicit information of water content of ice hydrometeors. Above the melting layer, the simulated polarimetric variables also show weak variability, which can be at least partly explained by the reduced particle diversity in the model and the inability of the T-matrix method to reproduce the polarimetric signatures of snow and graupel; i.e. current forward operators need to be further developed to fully exploit radar data for model evaluation and improvement. Below the melting level, the model captures the observed increase in reflectivity, Z(DR) and specific differential phase (K-DP) towards the ground. The contoured frequency altitude diagrams (CFADs) of the synthetic and observed polarimetric variables were also used to evaluate the model microphysical processes statistically. In general, CFADs of the cross-correlation coefficient (rho(hv)) were poorly simulated. CFADs of Z(DR) and K-DP were similar but the model exhibits a relatively narrow distribution above the melting layer for both, and a bimodal distribution for Z(DR) below the melting layer, indicating either differences in the mechanism of precipitation formation or errors in forward operator which uses a functional form of drop size distribution. In general, the model was found to underestimate the convective area fraction, high reflectivities, and the width/magnitude of Z(DR) columns, all leading to an underestimation of the frequency distribution for high precipitation values.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000809911800001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273334
作者单位	University of Bonn
推荐引用方式 GB/T 7714	Shrestha, Prabhakar,Troemel, Silke,Evaristo, Raquel,et al. Evaluation of modelled summertime convective storms using polarimetric radar observations[J],2022,22(11):26.
APA	Shrestha, Prabhakar,Troemel, Silke,Evaristo, Raquel,&Simmer, Clemens.(2022).Evaluation of modelled summertime convective storms using polarimetric radar observations.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(11),26.
MLA	Shrestha, Prabhakar,et al."Evaluation of modelled summertime convective storms using polarimetric radar observations".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.11(2022):26.