The Okhotsk tropospheric cyclone and its role in the occurrence of extreme air temperature in January in 1950-2019

Shatilina, T. A.; Tsitsiashvili, G. Sh.; Radchenkova, T. V.

doi:10.37162/2618-9631-2021-3-64-79

Cited by 3 publications

(1 citation statement)

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“…The intensity and the number of continental and marine cyclones moving along different tracks to the Okhotsk Sea or adjacent areas of the Japan Sea [61] change from year to year and over longer time periods [83,87], depending on the synoptic characteristics of these periods, as well as anomalies of the centers of action of the atmosphere, which contribute to the strengthening or weakening of cyclogenesis in Northeast Asia, the northwestern Pacific Ocean and marginal seas. The atmospheric circulation over the Sea of Okhotsk in the winter season is also influenced by the tropospheric cyclone identified on average monthly maps by the H500mb geopotential height [88]. Extremely low air temperatures over the coast of northeastern Asia are related with this cyclone development over the Okhotsk Sea.…”

Section: Typical Changes In Atmosphere Circulation Affecting Bioaeros...mentioning

confidence: 99%

Bioaerosols as Evidence of Atmospheric Circulation Anomalies over the Okhotsk Sea and Shantar Islands in the Late Glacial–Holocene

Razjigaeva

Ganzey

Grebennikova

et al. 2022

Climate

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Allochthonous biofossil distribution in the blanket peat bog of Bolshoy Shantar Island was used to analyze atmospheric circulation anomalies in the north-western Okhotsk Sea over the last 12.6 ka. The main aim of this study was to determine periods of intensification of deep cyclones and extreme storms. The composition of bioaerosols is significantly influenced by atmospheric zonal and meridional transport anomalies associated with anomalies of the monsoon system of Northeast Asia, atmospheric fronts and cyclone trajectories. Marine diatoms enter the peatland from the sea during extreme storms and record the passage of sea cyclones in the autumn-winter, whereas the distribution of allochthonous pollen indicates the intensity of continental cyclones. We used Pinus pumila pollen as an indicator of heavy snowfalls and winter cyclone activity. Fifteen phases of extreme storms were identified. Changes in ice coverage also played an important role in bioaerosol emission. During cold periods, emissions of bioaerosols mainly occurred in the open sea, whereas during warm periods, emissions occurred near the coast. The recurrence and intensity of cyclones during the cold seasons depends on displacement of the Siberian High and Aleutian Low. Periods of continental cyclones intensified in spring-summer and coincided with periods of active winter cyclogenesis 2212.

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Section: Typical Changes In Atmosphere Circulation Affecting Bioaeros...mentioning

confidence: 99%

Bioaerosols as Evidence of Atmospheric Circulation Anomalies over the Okhotsk Sea and Shantar Islands in the Late Glacial–Holocene

Razjigaeva

Ganzey

Grebennikova

et al. 2022

Climate

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“Cold-Dry” and “Cold-Wet” Events in the Late Holocene, Southern Russian Far East

Razjigaeva

Ganzey

Grebennikova

et al. 2023

Climate

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Two late Holocene cold events were described for the Southern Russian Far East: 2800–2600 year BP and the Little Ice Age (LIA) (~1300–1850 CE). The synthesis is based on multi-proxy records on profile “the mainland (Primorye)-islands (Sakhalin-Kurils)”. Main archives are sediments of small lakes and peat bogs that recorded the high-resolution environmental changes. The temporal resolution of reconstructions here is up to 26–40 years. During the cold event of 2800–2600 year BP, the humidity decreased sharply, there were long-term dry seasons without strong floods, and buried soil formed on floodplains. The LIA was wet in the mainland and the Kurils, with frequent strong floods, but was drier in Sakhalin. The cooling was characterized by sharp temperature fluctuations where high moisture conditions alternated with short-term drier periods. The shift in geographical position and intensity of the main centers of atmospheric action caused a paleoclimatic interpretation of these events (Aleutian Low, Siberian and North Pacific Highs, the summer Okhotsk anticyclone and the Far East depression). Changes in the North Pacific oscillations played an important role in the alternation of cold-dry and cold-wet periods. Anomalies in the intensity of El Niño and the monsoon system led to changes in tropical and extratropical cyclone trajectories and cyclogenesis in general.

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Processing Large Outliers in Arrays of Observations

Tsitsiashvili

2022

Mathematics

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The interest in large or extreme outliers in arrays of empirical information is caused by the wishes of users (with whom the author worked): specialists in medical and zoo geography, mining, the application of meteorology in fishing tasks, etc. The following motives are important for these specialists: the substantial significance of large emissions, the fear of errors in the study of large emissions by standard and previously used methods, the speed of information processing and the ease of interpretation of the results obtained. To meet these requirements, interval pattern recognition algorithms and the accompanying auxiliary computational procedures have been developed. These algorithms were designed for specific samples provided by the users (short samples, the presence of rare events in them or difficulties in the construction of interpretation scenarios). They have the common property that the original optimization procedures are built for them or well-known optimization procedures are used. This paper presents a series of results on processing observations by allocating large outliers as in a time series in planar and spatial observations. The algorithms presented in this paper differ in speed and sufficient validity in terms of the specially selected indicators. The proposed algorithms were previously tested on specific measurements and were accompanied by meaningful interpretations. According to the author, this paper is more applied than theoretical. However, to work with the proposed material, it is required to use a more diverse mathematical tool kit than the one that is traditionally used in the listed applications.

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The Okhotsk tropospheric cyclone and its role in the occurrence of extreme air temperature in January in 1950-2019

Cited by 3 publications

References 0 publications

Bioaerosols as Evidence of Atmospheric Circulation Anomalies over the Okhotsk Sea and Shantar Islands in the Late Glacial–Holocene

Bioaerosols as Evidence of Atmospheric Circulation Anomalies over the Okhotsk Sea and Shantar Islands in the Late Glacial–Holocene

“Cold-Dry” and “Cold-Wet” Events in the Late Holocene, Southern Russian Far East

Processing Large Outliers in Arrays of Observations

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