Table of Contents
International Journal of Atmospheric Sciences
Volume 2015, Article ID 932474, 11 pages
http://dx.doi.org/10.1155/2015/932474
Research Article

Drought and Grain Crop Yields over the East European Plain under Influence of Quasibiennial Oscillation of Global Atmospheric Processes

1Institute of Geography, Russian Academy of Sciences, Staromonetny Per. 29, Moscow 119017, Russia
2Odessa State Environmental University, Lvovskaya Street 15, Odessa 65016, Ukraine
3Institute of Global Climate and Ecology, Hydromet, Glebovskaya Street 20B, Moscow 107258, Russia

Received 23 June 2014; Revised 13 December 2014; Accepted 21 December 2014

Academic Editor: Thomas Reichler

Copyright © 2015 Elena Cherenkova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Monthly precipitation and the 3-month Standardized Precipitation Index (SPI) were used to reveal the patterns of rainfall and severe drought frequency over the East European Plain in the period 1953–2011 in the opposite phases of the quasibiennial oscillation (QBO). Differences of precipitation and severe drought frequency in May and in June in the westward and eastward phases of the QBO phases are explained by circulation variations. The analysis indicates less frequent severe drought events over Ukraine and at the center of the European part of Russia in May in the westward QBO phase due to the intensification of the storm track over the East European Plain. The weather conditions in May and in June in the years of the westward QBO phase were more favorable for the yield. The difference of spring wheat yield in the westward and eastward QBO phase exceeds the same difference of winter wheat yield in the Central Black Earth region and in the south regions. Ukraine and the region to the east of the Sea of Azov are the most vulnerable areas of increased risk of severe drought during the active growing season at the end of the 20th and beginning of the 21st century.