Potential factors modulating ENSO's influences on the East Asian trough in boreal winter

Yu, Sujuan; Sun, Jianqi

doi:10.1002/joc.6505

Cited by 19 publications

(15 citation statements)

References 71 publications

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“…Distinct negative GPH values below −1 are found in East Asia between 115-130 • E from 850 hPa to 300 hPa, with a center in the middle troposphere at 600-500 hPa (Figure 6a). This vertical distribution indicates that the deep trough over the domain plays an important role in the cold extremes, a factor which has been widely explored in previous studies [51][52][53][54].…”

Section: Dominant Circulation Patterns Of the Ecss In The Competition...mentioning

confidence: 68%

Pre-Signal and Influencing Sources of the Extreme Cold Surges at the Beijing 2022 Winter Olympic Competition Zones

2020

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The 24th Olympic and Paralympic Winter Games will take place in Beijing in 2022. All three competition zones are vulnerable to extreme cold surges (ECSs), owing to the occurrence of the East Asian winter monsoon. In this paper, a representative competition domain (37.5–42.5° N, 110–120° E) is adopted, with a view to avoiding the differences in both the geographies and the thresholds of ECSs among different zones by considering the probability of simultaneous occurrences. Since 2009, the ECSs in the domain have displayed higher frequency and extremity. Based on all ECS cases in the domain, the dominant circulation is revealed by a quasi “reverse-Ω” pattern, with two strong ridges over the east of the Ural Mountain and the Okhotsk Sea, and a broad, deep trough in East Asia. The influencing sources of the ECSs at the domain could be traced to the Novaya Zemlya by a day-by-day backward analysis. The oblique latitude/longitude–time profiles of both the 500 hPa geopotential height and the 850 hPa air temperature anomalies from the source to the domain clearly indicate that the pre-signal could have a leading influence that exceeds ten days, with a slow accumulation in the first stage and a rapid outburst in the second stage.

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Section: Dominant Circulation Patterns Of the Ecss In The Competition...mentioning

confidence: 68%

Pre-Signal and Influencing Sources of the Extreme Cold Surges at the Beijing 2022 Winter Olympic Competition Zones

2020

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“…This implies that the wave train related to EOF1 mode may be correlated with El Niño−Southern Oscillation (ENSO). Yu and Sun (2018, 2020) and An, Wang, et al. (2022) reported that eastern Pacific El Niño events can trigger the eastward wave‐like patterns.…”

Section: Spatiotemporal Characteristics Of High‐ and Low‐latitude Wav...mentioning

confidence: 99%

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

Chen

et al. 2022

JGR Atmospheres

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The Rossby wave train in boreal winter sometimes bifurcates into two branches near the Mediterranean, sometimes not. However, causes for bifurcating of the wave train are still being debated. Additionally, discussions about the differences in the deterioration ability of these wave trains on air pollution are also insufficient. This study uses the empirical orthogonal function (EOF) to obtain two dominant modes of the November‐January season wave trains over Eurasia and discusses their different influences on air pollution over the North China Plain (NCP). From the EOF1 mode, bifurcation of the wave train appears to stem from the Rossby wave reflection near the Mediterranean because the Rossby wave source is located outside of a strong absolute vorticity gradient. From the EOF2 mode, the wave train propagates only along the subtropical westerly jet because the Rossby wave source is located inside of a strong absolute vorticity gradient, so that the wave train tends to be refracted near the Mediterranean. In addition, the wave train associated with the EOF1 is suggested to be related to the eastern Pacific El Niño. The eastern Pacific El Niño tends to force a wave train propagating into East Asia under the charger effect from positive feedback of air‐sea coupling near the far eastern Atlantic and Mediterranean, while the wave train associated with the EOF2 is suggested to be mainly induced by natural internal variability. Furthermore, the results indicate that the bifurcation type wave train tends to cause higher PM2.5 concentrations over the NCP through a strengthened Northeast Asia anomalous anticyclone.

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“…Recent analyses indicated that variations in the mid-to-high-latitude atmospheric circulations also have a modulation effect on the connection between ENSO and the EAWM. 54,69 Effects of the AO on the EAWM and the roles of stationary planetary waves. The AO is the dominant mode of extratropical atmospheric circulation in the Northern Hemisphere.…”

Section: Unstable Influence Of Enso On the Eawmmentioning

confidence: 99%

Climate variability of the East Asian winter monsoon and associated extratropical–tropical interaction: a review

Chen

2021

Annals of the New York Academy of Sciences

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The East Asian winter monsoon (EAWM) is one of the most important climate systems during boreal winter. It has a large meridional extent and provides a vital bridge between the mid-to-high latitudes and the tropics. This paper reviews the latest research on the climate variability of the EAWM, with particular emphasis on the associated processes of extratropical-tropical interaction. Some new results have been achieved in understanding the variation of the EAWM on interdecadal, interannual, and intraseasonal time scales, such as the interdecadal strengthening in the early 21st century, the unstable impact of El Niño-South Oscillation (ENSO) on the EAWM, and the intraseasonal strong cold events in East Asia. In addition, understanding of the extratropical-tropical interactions related to the EAWM has improved in several aspects, including the impacts of the EAWM on ENSO-related climate effects, and the variation of regional Hadley circulation over the western Pacific and its climate impacts in the Asia-Australia region. Moreover, recent work has systematically evaluated the capacity of climate models to simulate the EAWM, including its climatology, interannual to interdecadal variations, and its relationship with ENSO. Finally, some scientific issues regarding our understanding of the EAWM are proposed for future investigation.

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Potential factors modulating ENSO's influences on the East Asian trough in boreal winter

Cited by 19 publications

References 71 publications

Pre-Signal and Influencing Sources of the Extreme Cold Surges at the Beijing 2022 Winter Olympic Competition Zones

Pre-Signal and Influencing Sources of the Extreme Cold Surges at the Beijing 2022 Winter Olympic Competition Zones

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

Climate variability of the East Asian winter monsoon and associated extratropical–tropical interaction: a review

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