A comparative assessment of the aridity indices for analysis of the hydrothermal conditions

1st International Geographical Conference of North Asian Countries "China-Mongolia-Russia Economic Corridor: Geographical and Environmental Factors and Territorial Development Opportunities"

地球科学;生态环境科学;经济学

Voropay, N.N.^1,2 ; Ryazanova, A.A.^1

Institute of Monitoring of Climatic and Ecological Systems SB RAS, Tomsk, Russia^1

Sochava Institute of Geography SB RAS, Irkutsk, Russia^2

关键词: Air temperature;    Aridity index;    Comparative assessment;    Drought indices;    Hydrothermal conditions;    Integrated packages;    Linear correlation;    Software modules;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/190/1/012041/pdf
DOI  :  10.1088/1755-1315/190/1/012041

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Comparison between hydrothermal coefficient of Selyaninov (HTC), Ped' drought index (Si) and indices SPI, SPEI are presented. Indices were calculated for the territory of Southern Siberia (50-65 N, 60-120 E). Functionality of the web-GIS "CLIMATE" was extended by a software module based on the integrated package to calculate indices. The ECMWF ERA-Interim reanalysis data on air temperature and precipitation were used as input data for the study. Analysis were carried out for the warm season from 1979 to 2017. The highest coefficients of linear correlation were obtained by comparing SPI and SPEI (0.8-0.9), Si and HTC (0.7-0.9) from June to August. Distribution of the number of strong and extreme droughts over the study period according to SPI and SPEI indices is the same, 2-3 strong droughts was observed per period. According to the analysis of Si, the highest frequency of strong droughts (up to 4) was observed also in July and August. But it was recorded only at the Sayan Mountains region. According to the results of the anomaly of HTC analysis, June and August are most droughty (2-3 strong droughts per period). The identified intensity and duration of droughts, based on these indices do not always coincide.