Atmospheric blockings in Western Siberia. Part 1. Detection features, objective criteria, and their comparison

Antokhina, O. Yu.; Antokhin, P. N.; Zorkaltseva, Olga; Devyatova, Elena

doi:10.3103/s106837391710003x

Cited by 8 publications

(2 citation statements)

References 12 publications

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“…We wrote in Antokhina et al [8] that detecting blockings purely over Western Siberia (or another sufficiently narrow longitudinal sector) is a formal procedure. Addressing those processes as independent processes is, strictly speaking, incorrect.…”

Section: Discussionmentioning

confidence: 99%

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2004–2016 Wintertime Atmospheric Blocking Events over Western Siberia and Their Effect on Surface Temperature Anomalies

et al. 2018

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Western Siberia is a large area in Northern Eurasia, which lies between the Urals and the Yenisei River. The atmospheric blocking events are not a frequent phenomenon in this region. Nevertheless, they noticeably affect the weather and living conditions of people there. We have investigated 14 winter blocking events, identified over Western Siberia, over 2004-2016, and have studied their effect on the surface temperature in this region. We have compared each of the 14 blocking events to the corresponding surface temperature anomalies in the north and in the south of Western Siberia. As a result, the temperature anomalies were separated into two groups: (1) dipole, with a positive surface temperature anomaly (or close to the norm) in the north, and with a negative anomaly (or close to the norm) in the south, and (2) non-dipole. Ten events were attributed to Group 1, four events were referred to Group 2. Analyzing the potential temperature on the dynamic tropopause (advection characteristic) showed that the Group 1 events feature strong advection over the investigated territory. In the non-dipole situations from Group 2 Western Siberia are away from strong blocking events.

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Section: Discussionmentioning

confidence: 99%

“…We use a blocking index algorithm as in Cheung et al [5]. According to Antokhina et al [8], this criterion is optimal for autodetecting blockings in Western Siberia:…”

Section: Methodsmentioning

confidence: 99%

2004–2016 Wintertime Atmospheric Blocking Events over Western Siberia and Their Effect on Surface Temperature Anomalies

et al. 2018

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Estimation of methane emissions from wetlands and most extreme fires in Western Siberia based on MACC / CAMS and GFED data

Antokhina

Antokhin

Martynova

2019

IOP Conf. Ser.: Earth Environ. Sci.

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Methane is an important greenhouse gas, and its atmospheric concentration has nearly tripled since pre-industrial times. This paper presents estimates of the strength of two primary sources of methane emissions in Western Siberia: wetlands emissions (WEs) and methane emissions from biomass burning (BBEs). The atmospheric circulation data used are from ECMWF Era-Interim, BBE – GFED (Global Fire Emissions Database) and CAMS GFAS (Global Fire Assimilation System), WE – MACC-III greenhouse gases inversions, v10_an. We have revealed that the highest BBE in Western Siberia (summer periods of 2005, 2006, 2007, 2010, 2011, 2012, and 2013) are accompanied by blocking in the atmosphere. We have also showed that there is a lag of 3-6 days between the beginning of the blocking and the periods of maximum BBE. Features of Rossby wave dynamics and blocking highs and ridges are examined as a possible reason for the lag. It turned out that the maximum BBE is commonly observed when a blocking high (or ridge) is shifted from Western to Eastern Siberia. The GFAS data demonstrate higher BBE than GFED (except for 2010). According to GFED, the average emission for all years is only 14.2% from WEs (the maximum emission is 35% (2012), and the minimum one, 2.2% (2007) from WEs). According to GFAS, the average emission for all years is 38.1% from WEs (the maximum emission is 127,4% (2012), and the minimum one, 6.1 (2010) % from WEs).

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Formation of gases and aerosol composition in background and urban areas of Western Siberia: a case study for the record-breaking hot April of 2020

Antokhina

Antokhin

Arshinov

et al. 2020

IOP Conf. Ser.: Earth Environ. Sci.

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This paper presents results of a comprehensive analysis of the formation of gases and aerosol composition during the anomalously hot April 2020 in Western Siberia. The analysis of the observed change in atmospheric composition and a modeling study with the WRF-Chem is carried out for suburban (TOR-station) and background (FON-station) areas. Two episodes of increased gases and aerosols were detected:13-15 April with a peak on 14 (in most part for the TOR station: increased NO, NO2, CO, CO2, aerosols) and 17-24 April with a peak on 23 (for both stations O3, aerosol, in most part for the FON station: NO2, SO2, CO, and CO2). Atmospheric circulation in the first episode was characterized by mesoscale differences between the two studied locations (surface temperature delta, although both stations are in the same region of large-scale transfers). For the second episode, a large scale atmospheric ridge was observed, which caused a transboundary transfer from Northern Kazakhstan and early wildfires. The simulation with WRF has demonstrated in most cases only the role of wildfires and, in general, has not demonstrated any observed differences between the two episodes. It shows that there is a need to search for more sensitive methods of discovering sources of pollution.

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Atmospheric blockings in Western Siberia. Part 1. Detection features, objective criteria, and their comparison

Cited by 8 publications

References 12 publications

2004–2016 Wintertime Atmospheric Blocking Events over Western Siberia and Their Effect on Surface Temperature Anomalies

2004–2016 Wintertime Atmospheric Blocking Events over Western Siberia and Their Effect on Surface Temperature Anomalies

Estimation of methane emissions from wetlands and most extreme fires in Western Siberia based on MACC / CAMS and GFED data

Formation of gases and aerosol composition in background and urban areas of Western Siberia: a case study for the record-breaking hot April of 2020

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