Rossby wave packets in the upper troposphere and their associations with climatological summertime daily precipitation in <scp>MLRYR</scp> of China

Sun, Siyuan; Guan, Zhaoyong

doi:10.1002/asl.1023

Cited by 3 publications

(2 citation statements)

References 29 publications

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“…Firstly, the disturbance generates at the exit of the westerly jet over the North Pacific, where cyclone shear exists, then propagates downstream as wave packets; after that, the northerly westerlies over North Atlantic extend the wave train to the Eurasian continent, with the same downstream development situation like type1, leading to the outbreak of extreme cooling. In many studies, the RWPs are usually found in the subtropical westerly jet over Asia (Watanabe 2004), which can easily affect the precipitation over south China (Li and Sun 2015;Hu et al 2018;Sun and Guan 2020). In this work, however, the westerlies over North Atlantic can also act as a waveguide.…”

Section: Type 3: Atlantic-originmentioning

confidence: 84%

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Zhuo¹,

Huang²,

Ding³

et al. 2021

Preprint

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This work examines precursory atmospheric circulations with various wave trains contributing to extreme cooling over central Eurasia in boreal winter from 1979-2016 based on the ERA-Interim dataset. The empirical orthogonal function (EOF) method is used to classify the anomalous sea level pressure field averaged in two weeks prior to extreme cooling. Based on the classification, three types of precursory atmospheric circulation patterns are named according to the origins of wave trains, and their formation mechanisms are revealed as well . Type1: Baffin Bay-origin pattern, which forms in the downstream development of Rossby wave packets generated from the downward stratospheric energy transmission over the Baffin Bay. Type2: Pacific-origin pattern, similar to a Eurasian (EU) teleconnection pattern, arises at the exit area of the westerly jet in the central North Pacific where cyclonic shear exists; then it develops along the northerly westerly jet over the North Atlantic, which may act as a waveguide to the Eurasian continent. Type 3: Atlantic-origin, manifests as the negative phase of type 2, consistent with the Scandinavian (SCAND) pattern, which may results from the air-sea interaction induced by the warm anomaly of sea surface temperature in the middle of North Atlantic. In conclusion, the three types of precursory atmospheric wave train patterns that bring extreme cooling to Eurasia possess diverse disturbing sources and development mechanisms. The results, which are investigated based on a quasi-biweekly time scale , deepen our understanding of the atmospheric genesis of extreme weather and have specific indicative significance to improve the technique of extended forecast.

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Section: Type 3: Atlantic-originmentioning

confidence: 84%

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Zhuo¹,

Huang²,

Ding³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Accordingly, it can be seen that the direction of wave packets propagating at pentad 2 precisely matches the way of westerly jet stretch (Figure 4c), which denotes the westerly jet may act as a waveguide here to promote the wave packets developing to downstream. In many studies, the wave packets are usually found in the subtropical westerly jet over Asia (Watanabe, 2004), which can easily affect the precipitation over south China (Hu et al, 2018; Li & Sun, 2015; Sun & Guan, 2020). In this work, however, the westerlies over North Atlantic in type 3 event can also act as a waveguide.…”

Section: The Formation Mechanisms Of the Three Types Of Wave Trainsmentioning

confidence: 99%

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Zhuo

Huang

Ding

et al. 2023

Intl Journal of Climatology

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This work examines precursory atmospheric circulations with various wave trains contributing to extreme cold weather over central Eurasia in boreal winter from 1979 to 2019. By conducting extended empirical orthogonal function (EEOF) on the preceding propagation circulation fields 2 weeks before the onset of extreme cold event (ECE) cases, three types of ECEs with different disturbance origins are classified and analysed. Type 1 denotes the positive phase of EEOF mode 1, shows as negative phase of Arctic Oscillation-like pattern.The outbreak of this type of ECE is affected by a wave train originating from Baffin Bay, where an anomalous anticylonic system persisted under a background of weakened westerlies over middle-high latitudes. Type 2 is picked from positive phase of EEOF mode 2, manifests as a developing blocking system that forms over Scandinavia and shifts to the Barents area. It is found that the blocking system is mainly strengthened by the downstream dispersion process of wave packets that are generated at the northern exit area of the North Pacific westerly jet, where exist anomalous cyclonic zonal wind shear and precipitation. Type 3 is selected from the negative phase of EEOF mode 2, which has a similar origin to type 2 but with the North Pacific jet exit more southward. Then, the generated wave packets propagate to Europe along the northerly jet stream over the North Atlantic, which acts as a waveguide and extends the wave train to downstream. In a word, these three types of precursory atmospheric wave train patterns that bring extreme cold anomalies to Eurasia possess diverse disturbing sources and downstream development mechanisms, and the essential role of the westerly jet is further highlighted. The results, which are investigated based on a quasi-biweekly time scale, may deepen our understanding of the atmospheric genesis of extreme weather and improve extended-range weather forecast.

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Interannual variations in ozone pollution with a dipole structure over Eastern China associated with springtime thermal forcing over the Tibetan Plateau

Yang,

Zhao,

Bai

et al. 2024

Science of The Total Environment

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Rossby wave packets in the upper troposphere and their associations with climatological summertime daily precipitation in MLRYR of China

Cited by 3 publications

References 29 publications

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Precursory atmospheric circulations with Rossby wave trains leading to Eurasian extreme cold events

Interannual variations in ozone pollution with a dipole structure over Eastern China associated with springtime thermal forcing over the Tibetan Plateau

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