Possible Dynamic Mechanisms of High‐ and Low‐Latitude Wave Trains Over Eurasia and Their Impacts on Air Pollution Over the North China Plain in Early Winter

An, Xiadong; Chen, Wen; Fu, Shuo; Hu, Peng; Li, Chun

doi:10.1029/2022jd036732

Cited by 15 publications

(19 citation statements)

References 60 publications

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“…As a result, the wave train is mainly trapped by the jets there and then travels southwards to East Asia (figure 2(a)). The SAJ is activated as a zonal waveguide for the wave train (Song et al 2014, An et al 2022). Notably, from lag 0 d onwards, the jets near Lake Baikal start to move northwards significantly so that a small fraction of the planetary waves traveling to northern Lake Baikal is also trapped by the jets for southward spread (figure 2(a)).…”

Section: Discussion Of Possible Mechanismsmentioning

confidence: 99%

Combined impact of summer NAO and northern Russian shortwave cloud radiative effect on Eurasian atmospheric circulation

Liu

Ding

2023

Environ. Res. Lett.

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Based on ERA-Interim and CERES_SYN1deg Ed4.1 datasets, the combined influence of summer North Atlantic Oscillation (SNAO) and positive shortwave cloud radiative effect (SWCRE) events in northern Russia on Eurasian atmospheric circulation is investigated at the intraseasonal scale. The impact of the SNAO on the position of the North Atlantic storm track (NAST) is modified combined with the Ural anticyclone anomaly contributed by positive northern Russian SWCRE anomalies, which could affect the summer stationary wave pattern. During positive northern Russian SWCRE events under SNAO+, the upstream wave train enhanced by the southward Ural anticyclone anomaly is easily trapped by the northward South Asian jets (SAJ), thus propagating to low latitudes and causing extreme heat events in East Asia. Under SNAO-, the wave train propagates in the British-Baikal Corridor (BBC) pattern along polar front jet (PFJ) towards the Far East, slowing down the dramatic melting of sea ice in the Laptev and East Siberian seas. Summer positive SWCRE events in northern Russian act as a bridge by promoting the emergence of the Ural anticyclone anomaly, influencing extreme weather in East Asia and Arctic sea ice variability.

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Section: Discussion Of Possible Mechanismsmentioning

confidence: 99%

Combined impact of summer NAO and northern Russian shortwave cloud radiative effect on Eurasian atmospheric circulation

Liu

Ding

2023

Environ. Res. Lett.

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“…The results indicate that ENSO contribute greatly to the formation of the South wave train, and can also partly lead to the formation of the North wave train. Actually, according to previous studies, ENSO may induce a wave train that splits into two branches in Eurasia or cause a strong wave train to spread from mid-high latitudes to eastern China (Sun et al, 2019;An et al, 2022). Ma et al (2022) pointed out that ENSO can induce significant precipitation anomalies in the eastern Indian Ocean/western Pacific through the double Walker circulation, which in turn affects the atmospheric circulations and results in a wave train similar to the South wave train in the upper troposphere.…”

Section: Figurementioning

confidence: 99%

Variations and possible causes of the December PM2.5 in Eastern China during 2000–2020

Bai

Liu²,

Dong³

et al. 2023

Front. Environ. Sci.

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High air pollutions of PM2.5 concentrations have become a serious environmental problem in China during recent decades, causing significant influences on urban air quality and human health. In the study, we investigate the variations of the December PM2.5 in Eastern China and the possible causes during 2000–2020. The empirical orthogonal function (EOF) analysis is employed to reveal the dominant patterns of PM2.5 variability in Eastern China. The EOF1 shows a consistent variability in the whole of the Eastern China, which reflects a consistent emission pattern in Eastern China in past two decades. The EOF2 exhibits a North-South dipole pattern, which is closely tied to the changes of atmospheric circulations. The increase of PM2.5 in the North Eastern China is mainly related to the decrease of wind speed, the decrease of boundary layer height and the increase of inversion temperature, while the decrease of PM2.5 in the South Eastern China is affected by the increase of local precipitation. Two atmospheric wave trains are identified that affect the dipole distribution of PM2.5 in Eastern China. The southern one is affected by ENSO, and the northern one is jointly affected by ENSO, sea surface temperature of Labrador Sea and sea ice concentration near Kara Sea. Finally, we reconstructed a comprehensive atmospheric external forcing index based on these factors. We find that the comprehensive index can well reproduce the North-South dipole distribution of PM2.5 in Eastern China, indicating the plausible effects of the atmospheric external forcings and the prediction potential for the variations of PM2.5 in Eastern China.

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“…El Niño is usually accompanied by a weakening of the EAWM, which advects warm and moist air to East Asia such as southern China, Japan, and Korea; reversed conditions are observed in the La Niña winters, but with smaller amplitudes (e.g., Kug et al, 2012;Son et al, 2014;Ma et al, 2018a). Air pollution over northern China tends to get worse (lighter) during the El Niño (La Niña) winters due to the weakening (strengthening) of EAWM (An et al, 2022a;An et al, 2022b;Zhao et al, 2022).…”

Section: In Observationsmentioning

confidence: 99%

“…During boreal winter, there are two dominant modes of the wave train over Eurasia, the northern wave train along the polar jet and the southern wave train along the subtropical jet (Hu et al, 2018;. Studies suggested that El Niño tends to force a northern wave train that propagates into East Asia (Tian and Fan, 2020;Yu and Sun, 2020;An et al, 2022a;Zhao et al, 2022). This northern wave train is reinforced by the positive feedback effect of sea-air coupling over the Mediterranean (An et al, 2022a).…”

Section: Possible Mechanismsmentioning

confidence: 99%

“…Studies suggested that El Niño tends to force a northern wave train that propagates into East Asia (Tian and Fan, 2020;Yu and Sun, 2020;An et al, 2022a;Zhao et al, 2022). This northern wave train is reinforced by the positive feedback effect of sea-air coupling over the Mediterranean (An et al, 2022a). It has also been argued that the southern wave train, especially the parts over South and East Asia, can be forced by ENSO (Ma et al, 2022;Zhao et al, 2022).…”

Section: Possible Mechanismsmentioning

confidence: 99%

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Recent progress in understanding the interaction between ENSO and the East Asian winter monsoon: A review

Chen

2023

Front. Earth Sci.

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This paper reviews recent advances in understanding the interaction between the East Asian winter monsoon (EAWM) and El Niño-Southern Oscillation (ENSO). The achievements are summarized into two aspects: 1) the impacts of ENSO on the EAWM, and 2) effects of the EAWM on ENSO. For the first aspect, the results show that: the current climate model simulations of ENSO impacts on the EAWM have a common weaker bias than in the observations; The influence of central Pacific type ENSO on the EAWM is generally weaker than that of the eastern Pacific type ENSO; The precipitation anomalies in the tropical Indian Ocean tend to contribute to the intra-seasonal transition of ENSO teleconnection over East Asia; The ENSO-EAWM relationship is unstable and subject to non-linear modulation by the state of oceans and extratropical atmospheric phenomena, which include the Pacific Decadal Oscillation and the Arctic Oscillation. Regarding the second aspect, studies have shown that the “pure” EAWM (denoted as EAWMres), which is independent of the ENSO signal, can lead to significant variations in the tropical convection over the western Pacific, the local Hadley circulation over East Asia, and the Walker circulation over the equatorial latitudes; The CMIP6 models can preproduce the above EAWMres effects well, although with some weaker bias. The changes in tropical convection and extratropical zonal flow associated with the EAWMres tend to have a significant modulating effect on the ENSO atmospheric teleconnection over North America. A strong EAWM and a strong Australian summer monsoon coherently provide favorable conditions for the onset of El Niño.

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Possible Dynamic Mechanisms of High‐ and Low‐Latitude Wave Trains Over Eurasia and Their Impacts on Air Pollution Over the North China Plain in Early Winter

Cited by 15 publications

References 60 publications

Combined impact of summer NAO and northern Russian shortwave cloud radiative effect on Eurasian atmospheric circulation

Combined impact of summer NAO and northern Russian shortwave cloud radiative effect on Eurasian atmospheric circulation

Variations and possible causes of the December PM2.5 in Eastern China during 2000–2020

Recent progress in understanding the interaction between ENSO and the East Asian winter monsoon: A review

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