The publications in this series cover a wide range of subjects-from computer modeling to experience with water user associations-and vary in content from directly applicable research to more basic studies, on which applied work ultimately depends. Some research reports are narrowly focused, analytical and detailed empirical studies; others are wide-ranging and synthetic overviews of generic problems.Although most of the reports are published by IWMI staff and their collaborators, we welcome contributions from others. Each report is reviewed internally by IWMI staff, and by external reviewers. The reports are published and distributed both in hard copy and electronically (www.iwmi.org) and where possible all data and analyses will be available as separate downloadable files. Reports may be copied freely and cited with due acknowledgment. About IWMIIWMI's mission is to improve the management of land and water resources for food, livelihoods and the environment. In serving this mission, IWMI concentrates on the integration of policies, technologies and management systems to achieve workable solutions to real problems-practical, relevant results in the field of irrigation and water and land resources.

Considered are interannual variations of the river runoff in Transbaikalia during the freeze-up and their dependence on the climate change. The air temperature in winter has increased since the middle of the 20th century that results in the ice thickness decrease on the majority of rivers on the territory under study. The runoff volume in winter depends significantly on the preliminary moistening of catchments. Warming effect is manifested in the increase in the fraction of the winter runoff in the annual runoff volume during the long-term period.

No abstract

The problem of the climate change impact on the ice regime of lakes has become topical in view of the revealed (observed) shortening of the freeze-up duration and a decrease in the ice thickness for many years. The relationship between timing and duration of the ice events and climate characteristics had been found. The influence of climate change on the ice regime in the Transbaikalia was previously estimated by the example of the Ivano-Arakhley lakes. In this work we determined the trends of changes of the following parameters: air temperature, the duration of freeze-up and the maximal ice thickness as well as the reliability of these trends on lakes Arakhley, Shakshinsky, Bolshoy Leprindo, Gusinoye, Baunt, Sosnovoye. The least-squares method was used to determine the long-term trends; consistency of the changes in the studied characteristics was evaluated by means of the correlation analysis. The significance of the trends and correlation coefficients was evaluated using Student's t-statistics.

Assessment of changes in air temperature and precipitation in Transbaikalia/ Smakhtin V.K. // Hydrometeorological Research and Forecasting, 2021, no. 2 (380), pp. 138-146. The paper analyzes long-term fluctuations in average air temperature and annual total precipitation in Transbaikalia. Between 1951 and 2020, air temperature increased by 2.3 °C according to 40 weather stations. Warming is mainly manifested in the air temperature rise in February, March and April. From 1955 to 2017, the decrease in annual total precipitation was 56 mm in the Amur basin and 39 mm in the Yenisei basin. The trends are reliable at the 5% significance level. In the Lena basin, annual total precipitation during the mentioned period increased by 7 mm, the trend is not reliable at the 5% significance level. The high-water phase has been observed since 2017. Taking into account that two previous high-water phases lasted 16‒17 years, it may be supposed that a risk of precipitation above the normal will be kept in the next 13–14 years. Keywords: climate change, air temperature, precipitation, phases of water content, trendsRef. 81.