Changes in the summertime atmospheric circulation over East Asia and formation of long-lasting low-water periods within the Selenga river basin

Berezhnykh, T. V.; Марченко, Оксана; Abasov, N. V.; Mordvinov, Viatcheslav A.

doi:10.1134/s1875372812030079

Cited by 39 publications

(33 citation statements)

References 4 publications

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“…Mongolia and Transbaikalia (M-TB) have experienced severe drought in recent decades due to a decrease in precipitation and an increase in air temperature in summertime (Davi et al 2006(Davi et al , 2013Berezhnykh et al 2012;Erdenebat et al 2015;Obyazov et al 2015;Shubert et al 2014;Hessl et al 2018). A recent decade-long drought that exceeded the variability in the instrumental record (Hessl et al 2018) caused economic, social, and environmental change (Karthe et al 2014, Kasimov et al 2017).…”

Section: Introductionmentioning

confidence: 99%

A Cases Study Of Mongolian Cyclogenesis During The July 2018 Blocking Events

Antokhina

Латышева

Mordvinov

2019

GES

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Mongolia and Transbaikalia (M-TB) have experienced severe drought over the past 20 years due to the increased frequency of anticyclogenesis. However, in the summer of 2018, as a result of the formation of a series of cyclones over Mongolia and their move to the Transbaikalia, abnormally high precipitation was observed in the M-TB region. The dynamics of long Rossby waves and atmospheric blocking in the middle and upper troposphere were investigated to identify the causes of cyclogenesis over Mongolia. It was revealed that a sequence of events predefined the extreme precipitation in M-TB in the 2018 summer -the intensification of heat flux over the North Atlantic while maintaining cyclonic vorticity over Central Europe, the development of blocking ridges in the Urals and the Russian Far East, and an upper-level trough oriented to the eastern regions Mongolia. For a long time, the persistent advection of cold air in the rear part of the upper-level trough, as well as increased heat advection during the activation of the East Asian summer monsoon, caused meridional oriented upper-level front strengthening over the eastern regions of Mongolia and extreme precipitation.

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Section: Introductionmentioning

confidence: 99%

A Cases Study Of Mongolian Cyclogenesis During The July 2018 Blocking Events

Antokhina

Латышева

Mordvinov

2019

GES

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“…The lake is the basis of hydropower engineering in Eastern Siberia [1,2]. Since 1996, a low-water period has been observed in the basin [1,[3][4][5]. It is the longest one throughout the history of instrumental records.…”

Section: Introductionmentioning

confidence: 99%

“…The decreased inflow into Lake Baikal is mainly related to the reduced discharge in the Selenga River ( Figure 1) observed since 1996 [3][4][5][6][7][8]. The Selenga River is the lake's most important tributary.…”

Section: Introductionmentioning

confidence: 99%

“…The Selenga Basin is located in Mongolia and Russia, and it comprises 83.4% of Lake Baikal's catchment area [9]. The Selenga River contributes about 50% of the influx into Lake Baikal [4]. Atmospheric precipitation is the primary source of the river supply [4,8].…”

Section: Introductionmentioning

confidence: 99%

“…Primary drivers of precipitation fluctuations in the Selenga Basin are still not clear [4]. The uncertainty is caused by the location of the river basin at the border of mid-latitudes and subtropics.…”

Section: Introductionmentioning

confidence: 99%

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The Linkage of the Precipitation in the Selenga River Basin to Midsummer Atmospheric Blocking

et al. 2019

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The linkage between atmospheric blocking (blocking frequency, BF) and total monthly July precipitation in the Selenga River Basin, the main tributary of Lake Baikal, for the period 1979–2016 was investigated. Based on empirical orthogonal functions (EOF) analysis, two dominant modes of precipitation over the Selenga River Basin were extracted. The first EOF mode (EOF 1) is related to precipitation fluctuations mainly in the Mongolian part of Selenga; the second EOF mode (EOF 2)—in the Russian part of Selenga. Based on two different modes obtained, the total amount of precipitation individually for the Russian and Mongolian part of Selenga was calculated. Correlation analysis has demonstrated that precipitation over the Mongolian part of the Selenga Basin is positively correlated to blocking over Eastern Siberia/Mongolia (80–120° E, ESM-BF). Precipitation over the Russian part of the Selenga Basin is positively correlated to blocking over the Urals-Western Siberia (50–80° E, UWS-BF) and European blocking (0–50° E, E-BF). However, the linkage is not stable, and after the mid-1990s, the obtained positive correlation became insignificant. The analysis has shown that the dominance of E or ESM-blocking in July was the primary driver of the existence of two precipitation modes over the Selenga River Basin. During 1996–2016, the negative trend of time coefficients of EOF 1 and 2 for precipitation in Selenga had been observed, which was characterized by displacement of positive precipitation anomalies outside the basin. At the same time, there was a weakening of the linkage between precipitation in the Selenga Basin and blocking frequency. We have revealed two wave-like modes over Northern Eurasia and the subtropical part of Eurasia corresponding to E, ESM-blocks in 1979–1995 and 1996–2016. The change of the Northern and subtropical wave modes is one of the causes for the weakening of the linkage between atmospheric blocking and precipitation in the Selenga Basin and as a consequence decreased precipitation in the Russian and Mongolian part of Selenga during 1979–2016.

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