Distribution of extreme characteristics of atmospheric circulation from reanalysis data and hydrodynamic modeling

Муравьев, А. В.; Kulikova, I. A.; Kruglova, E. N.

doi:10.3103/s1068373909070036

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The study method and the CI calculation procedures were described in [11]. It is appropriate to remind that the large-scale atmospheric features are characterized by five circulation indices, or teleconnections [34]: the Eastern Atlantic (I EA ), the Western Atlantic (I WA ), the Pacific-North American (I PNA ), the Western Pacific (I WP ), and the Eurasian (I EU ).…”

Section: Methodsmentioning

confidence: 99%

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Synchronous and asynchronous relations between the North Atlantic SSTA and the Northern Hemisphere large-scale circulation features

Муравьев

Kulikova

Resnyanskii

2010

Russ. Meteorol. Hydrol.

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The spatial and temporal relationships between sea surface temperature anomalies (SSTA) in the North Atlantic and the large-scale mid-troposphere circulation features in the Northern Hemisphere during the summer and the winter seasons are investigated. Results are based on atmospheric circulation indices (CI), introduced by Wallace and Gutzler for physical reasoning the low frequency atmospheric oscillations. Extreme levels and extreme situations in the mid-troposphere were defined and the SSTA composite charts were constructed with backward lags from 0 to 3 months. Analysis shows that several CI extreme phases of different signs are associated with synchronous and asynchronous SSTA composites of statistically separable types, or even antipodes, which may be interpreted as the intraseasonal influence of the ocean on the large-scale mid-troposphere anomaly features. Noteworthy is the role of the North Atlantic tropical zone in formation of ridges and blocking situations both in synchronous and asynchronous aspects. The North Atlantic SSTA relations to the West Atlantic Oscillation are shown to be significantly weaker that the same to the East Atlantic Oscillation.

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Section: Methodsmentioning

confidence: 99%

“…The number of extremes always comprises about a quarter of all cases in accordance with the quartile thresholds. The corresponding histograms of the SI distributions for the given period are discussed in [11].…”

Section: Sample Data Representativeness For the Given Extremality Levelsmentioning

confidence: 99%

Synchronous and asynchronous relations between the North Atlantic SSTA and the Northern Hemisphere large-scale circulation features

Муравьев

Kulikova

Resnyanskii

2010

Russ. Meteorol. Hydrol.

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Results of Russian climate studies in 2007–2010

Мохов

2013

Izv. Atmos. Ocean. Phys.

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Circulation Indexes and the Cloud Cover During of the Global Warming Period

Zabolotska

Shpyg

Tsila

2021

Hydrology, Hydrochemistry and Hydroecology

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The investigations of connection between the different meteorological processes, for example, the circulation indexes with the quantity of the total and lower cloudiness during 1961-2018 over Ukraine were made. The spatial distributions of the total and lower cloudiness were received for 73 years (1946-2018) at first. The quantity of cloudiness is diminished from west to east and with north to south. The declinations of the annual data of total and lower cloudiness from the historical (1961-1990) and the present (1981-2010) norms were calculated. The great variations were characterized for the lower cloudiness. The linear trends showed that the diminish of the lower cloudiness was on 90 % of the all territory, this changes were important on 70 % of the territory. The trends of the monthly variations were showed on the diminish of the lower cloudiness in during all year only on north, on other territory was the increasing in the separate months, frequently in January and September. The variations of the total cloudiness were insignificant, the increase or decrease were nearly in equal parts. North Atlantic Oscillation (NAO), Arctic Oscillation (AO), East-Atlantic Oscillation (EA), Scandinavian Oscillation (SCAND), Greenlandic Oscillation (GBI) and South Oscillation (El-Niño) were used for the investigation of relationship between the circulation indexes and cloud cover. It was shown that different circulation indexes have influence on climate of Northern Hemisphere and on Ukraine too. The relation with each other and their variations in period of global warming were showed. The quantity estimation of the total and lower cloudiness variations was made by the frequencies of clear, semi clear and overcast sky in the successive decades and by the relative variations of frequencies between decades (1961-1970 and 1971-1980; 1971-1980 and 1981-1990; 1981-1990 and 1991-2000; 1991-2000 and 2001-2010; 2001-2010 and 2011-2018). The parallel analyze of the variations of circulation was estimated in that time. The difference between the circulating processes during 1961-1970 and 1971-1980 contributed to a decrease in the relative frequency of the clear sky (on 5.4%) and a slight increase of the overcast sky (on 1.6%) by total cloud cover and a slight increase of the clear sky (on 0.8 %) and a decrease of the overcast sky (on 5.2%) by lower cloudiness. At the same time, the relative frequency of the semi-clear sky by lower cloudiness almost in three times increased in comparison to total cloudiness (on 10.2% and 3.8%, respectively). In the third decade of 1981-1990 the relative frequency of clear sky by lower cloudiness increased on 5.1% and did not change by total cloudiness (0%). During this decade the relative frequency of overcast sky decreased the most in the whole period under study: by total cloudiness on 6.4% and by lower cloudiness on 13.3%. At the same time, the relative frequency of semi-clear sky had largest increasing: on 22.4% for total cloudiness and 13% for lower cloudiness. Then, during 1991-2000, the frequency of clear sky decreased significantly both for total cloudiness (on 6.5%) and for lower cloudiness (on 3.1%). The frequency of overcast sky decreased also, but less significantly (on 1.3% and 2.3%, respectively), thereby the number of clouds of the middle and upper levels increased. From 2001 to 2010, the frequency of clear sky by total cloudiness and by lower cloudiness continued to decrease (on 5.3 and 3.2%, respectively), but the frequency of overcast sky increased (on 0.9 and 1.7%, respectively), thereby the number of clouds for all levels increased. During 2011-2018 the frequency of clear sky by total cloudiness increased (on 0.9%) and by lower cloudiness did not change. The frequency of overcast sky decreased on 3.6% (by total cloudiness) and on 0.7% (by lower cloudiness). The variations of the relative frequencies of the different state sky between the successive decades are agreed with the changes of the circulation indexes.

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Distribution of extreme characteristics of atmospheric circulation from reanalysis data and hydrodynamic modeling

Cited by 5 publications

References 13 publications

Synchronous and asynchronous relations between the North Atlantic SSTA and the Northern Hemisphere large-scale circulation features

Synchronous and asynchronous relations between the North Atlantic SSTA and the Northern Hemisphere large-scale circulation features

Results of Russian climate studies in 2007–2010

Circulation Indexes and the Cloud Cover During of the Global Warming Period

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