Atmospheric circulation indices and their influence on the temperature regime of south coast of Crimea in winter periods

2020 ◽  
Author(s):  
Vitaliya Metik-Diyunova ◽  
Sergey I. Kazakov ◽  
Sergey Mayboroda ◽  
Alexander Boguslavsky
Keyword(s):  
Atmospheric Circulation ◽  
Temperature Regime ◽  
South Coast ◽  
Atmospheric Circulation Indices ◽  
Circulation Indices

INFLUENCE OF LARGE-SCALE ATMOSPHERIC PROCESSES ON SEASONAL RUNOFF OF LARGE SIBERIAN RIVERS

2021 ◽  
pp. 36-47
Author(s):  
L. N. VASILEVSKAYA ◽  
◽  
I. A. LISINA ◽  
D. N. VASILEVSKII ◽  
◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
River Runoff ◽  
Large Scale ◽  
Annual Runoff ◽  
Spring Flood ◽  
Atmospheric Circulation Indices ◽  
Rate Of Increase ◽  
Circulation Indices ◽  
Seasonal Runoff ◽  
Kolyma River

Based on daily runoff volumes of four large Siberian rivers (the Ob, Yenisei, Lena, and Kolyma) for 1936-2018, the regime and changes in the total annual and seasonal runoff are analyzed. High synchronous and asynchronous correlations between monthly river runoff and atmospheric circulation indices of hemispheric and regional scales are revealed. In recent decades, the total annual runoff and its variations have increased (the rate of increase is most pronounced for the Kolyma River). A change in water content within a year is heterogeneous: weak positive trends are characteristic of the spring flood runoff and the summer-autumn period, and a significant increase occurred in the winter months. High correlations with a 1-8-month shift made it possible to identify the most informative regions, the atmospheric circulation over which makes a certain contribution to the variance of river runoff.

scholarly journals The influence of atmospheric circulation on the occurrence of dry and wet periods in Central Poland in 1954–2018

2021 ◽  
Author(s):  
Andrzej Araźny ◽  
Arkadiusz Bartczak ◽  
Rafał Maszewski ◽  
Michał Krzemiński
Keyword(s):  
Atmospheric Circulation ◽  
The South ◽  
Central Poland ◽  
The North ◽  
Circulation Types ◽  
Atmospheric Circulation Indices ◽  
Standardised Precipitation Index ◽  
Circulation Indices ◽  
Weather Stations ◽  
The Masses

AbstractThis work presents the influence of atmospheric circulation on the occurrence of dry and wet periods in the central Polish region of Kujawy. The material on which the authors relied encompassed monthly totals of precipitation obtained from 10 weather stations in the period 1954–2018. Both dry and wet periods have been identified on the basis of monthly values of the Standardised Precipitation Index (SPI). Additionally, the calendar of circulation types over Central Poland was used to determine the atmospheric circulation indices: western (W), southern (S) and cyclonicity (C). The analyses have indicated that the region concerned experiences low precipitation totals in comparison with the rest of Poland. According to the circulation indices W, S and C, for Central Poland, the air mass advection from the West prevails over that from the East. Moreover, a slightly more frequent inflow of air from the South than from the North has been observed. The frequency of anticyclonic situations is higher than that of the cyclonic types in this part of Europe. Drought spells occurred in the study area at a clear dominance of anticyclonic circulation, with the inflow of air mostly from the North and with increased westerly circulation. On the other hand, the occurrence of wet periods was mainly influenced by cyclonic circulation during the advection of the masses from the South and West. Dry and wet periods accounted for 28% and 27% of the study period, respectively.

scholarly journals Possible influence of atmospheric circulations on winter haze pollution in the Beijing–Tianjin–Hebei region, northern China

2016 ◽  
Vol 16 (2) ◽  
pp. 561-571 ◽  
Author(s):  
Z. Zhang ◽  
X. Zhang ◽  
D. Gong ◽  
S.-J. Kim ◽  
R. Mao ◽  
...  
Keyword(s):  
Sea Level ◽  
Atmospheric Circulation ◽  
Correlation Coefficients ◽  
Northern China ◽  
Reanalysis Data ◽  
Atmospheric Circulations ◽  
Boundary Layer Height ◽  
Haze Pollution ◽  
Atmospheric Circulation Indices ◽  
Circulation Indices

Abstract. Using the daily records derived from the synoptic weather stations and the NCEP/NCAR and ERA-Interim reanalysis data, the variability of the winter haze pollution (indicated by the mean visibility and number of hazy days) in the Beijing–Tianjin–Hebei (BTH) region during the period 1981 to 2015 and its relationship with the atmospheric circulations at middle–high latitude were analyzed in this study. The winter haze pollution in BTH had distinct inter-annual and inter-decadal variabilities without a significant long-term trend. According to the spatial distribution of correlation coefficients, six atmospheric circulation indices (I1 to I6) were defined from the key areas in sea level pressure (SLP), zonal and meridional winds at 850 hPa (U850, V850), geopotential height field at 500 hPa (H500), zonal wind at 200 hPa (U200), and air temperature at 200 hPa (T200), respectively. All of the six indices have significant and stable correlations with the winter visibility and number of hazy days in BTH. In the raw (unfiltered) correlations, the correlation coefficients between the six indices and the winter visibility (number of hazy days) varied from 0.57 (0.47) to 0.76 (0.6) with an average of 0.65 (0.54); in the high-frequency ( < 10 years) correlations, the coefficients varied from 0.62 (0.58) to 0.8 (0.69) with an average of 0.69 (0.64). The six circulation indices together can explain 77.7 % (78.7 %) and 61.7 % (69.1 %) variances of the winter visibility and the number of hazy days in the year-to-year (inter-annual) variability, respectively. The increase in Ic (a comprehensive index derived from the six individual circulation indices) can cause a shallowing of the East Asian trough at the middle troposphere and a weakening of the Siberian high-pressure field at sea level, and is then accompanied by a reduction (increase) of horizontal advection and vertical convection (relative humidity) in the lowest troposphere and a reduced boundary layer height in BTH and its neighboring areas, which are favorable for the formation of haze pollution in BTH winter, and vice versa. The high level of the prediction statistics and the reasonable mechanism suggested that the winter haze pollution in BTH can be forecasted or estimated credibly based on the optimized atmospheric circulation indices. Thus it is helpful for government decision-making departments to take action in advance in dealing with probably severe haze pollution in BTH indicated by the atmospheric circulation conditions.

Variability of large-scale atmospheric circulation indices for the northern hemisphere during the past 100 years

2009 ◽  
Vol 18 (4) ◽  
pp. 379-396 ◽  
Author(s):  
Stefan Brönnimann ◽  
Alexander Stickler ◽  
Thomas Griesser ◽  
Andreas M. Fischer ◽  
Andrea Grant ◽  
...  
Keyword(s):  
Atmospheric Circulation ◽  
Northern Hemisphere ◽  
Large Scale ◽  
The Past ◽  
Atmospheric Circulation Indices ◽  
Circulation Indices ◽  
Large Scale Atmospheric Circulation
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