On characteristic reanalysis-based values of convective instability indices for Northern Eurasia tornadoes

Turbulence, Atmosphere and Climate Dynamics

生态环境科学

Chernokulsky, A.V.^1 ; Kurgansky, M.V.^1 ; Mokhov, I.I.^1^2

A.M. Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences (IAP RAS), Pyzhevsky 3, Moscow

119017, Russia^1

Lomonosov Moscow State University, Leninskie Gory 1, Moscow

119991, Russia^2

关键词: Characteristic value;    Convective instabilities;    Era interims;    Landfalling;    Northern Eurasia;    Reanalysis;    Shear parameters;    Threat scores;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/231/1/012012/pdf
DOI  :  10.1088/1755-1315/231/1/012012

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Characteristic values of nine convective instability indices (CII) including parcel and shear parameters and simplified indices are obtained for tornadoes and waterspouts over Northern Eurasia using ERA-Interim data for the 1979-2016 period. Tornado and waterspout data are extracted from a new database collected in IAP RAS. In general, strong and significant tornadoes are associated with higher values of CII, while waterspouts occur for lower values (especially of shear parameters). Magnitudes of CII for Northern Eurasia significant tornadoes are in general concordance with those for tornadoes in Europe and North America. Threshold values that discriminate between weak and significant tornadoes, and between landfalling and non-landfalling waterspouts, were found by maximizing Threat Score metrics for a particular CII index or for a pair of such indices. Shear parameters show the highest skill as it concerns separating significant and weak tornadoes. CIIs show lower skills for separation of landfalling and non-landfalling waterspouts.