Aridization of Drylands in the European Part of Russia: Secular Trends and Links to Droughts
https://doi.org/10.31857/S258755662002017X
Abstract
Secular trends in humidification in seven southern regions of the European part of Russia were investigated. Land degradation trend was assessed based on satellite albedo data at the beginning of the current century. Mutual compensation of intra-centuries fluctuations of the aridity index drives to the stability of arid zones in drylands. The insignificance of linear trend of the aridity index for the period 1901-2012 does not confirm the hypothesis of systematic strengthening of the aridization under ongoing global warming. The analysis of dry and wet years’ groups of the different duration revealed the decrease of the frequency of spring droughts, and their intensity achieved the maximum in 1981-1990. Frequency and intensity of summer droughts increased during the periods corresponding to the groups of growing aridization years. In the progress absence in aridization of drylands of the European part of Russia for more than 100 years, increased land degradation becomes the dominant factor of desertification.
Keywords
aridization,
trends,
aridity index,
standardized precipitation index,
drought,
drylands,
European part of Russia
Supporting agencies: The study of humidification trends was conducted within the framework of the scientific theme no. 0148-20190009 (АААА-А19-119022190173-2). Drought frequency analysis was carried out with the financial support of the Russian Science Foundation, project no. 19-17-00242
About the Authors
A. N. Zolotokrylin
Institute of Geography, RAS
Russian Federation
Russian Federation
Moscow
E. A. Cherenkova
Institute of Geography, RAS
Russian Federation
Russian Federation
Moscow
T. B. Titkova
Institute of Geography, RAS
Russian Federation
Russian Federation
Moscow
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Graphical Abstract
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1. Северные границы аридных зон и многолетние изменения индекса аридности | |
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2. Northern boundaries of arid zones and long-term aridity index changes | |
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- In a century scale the stability of arid zones in European Russia is determined by the mutual compensation of anomalies of the annual humidifying, preventing the systematic increase in aridization.
- The frequency of spring droughts decreased in all the regions. The frequency of summer droughts was the highest in the period 1931–1960 in Rostov and Volgograd regions. In the period 2001–2012, there were an increase in the intensity of spring droughts and a decrease in the intensity of summer droughts in all the regions.
- The longest growth of aridization was observed in the Orenburg (12 years), Saratov and Volgograd regions (11 years). Shorter series of droughts, of 4 to 6 years, were typical for the Republic of Kalmykia, Volgograd, Astrakhan, Rostov, and Stavropol regions.
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For citations:
Zolotokrylin A.N., Cherenkova E.A., Titkova T.B. Aridization of Drylands in the European Part of Russia: Secular Trends and Links to Droughts. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2020;84(2):207-217. (In Russ.) https://doi.org/10.31857/S258755662002017X
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