Estimation of meteorological drought based on a Standardized Precipitation Evapotranspiration Index

Abstract

Abstract. Various climatic indices are used to monitor meteorological drought, among which the best known are the standardized precipitation index and the standardized precipitation evapotranspiration index (SPEI). The purpose of the research is to assess the conditions of moisture content of the growing season of grain crops in agrolandscapes of the Novosibirsk region on the basis of standardised precipitation and evapotranspiration index. Methods. Methods of big data processing, statistical analysis were used in the study. The scientific novelty consists in assessing the humidity and intensity of drought during the growing season of grain crops based on the climate index of precipitation and evaporation, as well as identifying deviations of the average surface air temperature and precipitation from the norm in very dry and extremely dry years. Results. The estimation of agroclimatic conditions of moisture content of vegetation period of grain crops on the basis of time analysis of SPEI on the example of Novosibirsk region was carried out. On the basis of statistical analysis of changes in the SPEI value of different time resolution from one month to a year for the period from 1970 to 2021 on the example of the Novosibirsk region, the years characterised by severe and extreme drought were identified. Drought intensity in the central forest-steppe Priobskiy agricultural landscape is uneven during the growing season. The intensity of drought by month depends not only on the amount of precipitation, but also on the deviation of surface air temperature from the norm.