Different ENSO Teleconnections over East Asia in Early and Late Winter: Role of Precipitation Anomalies in the Tropical Indian Ocean and Far Western Pacific

Ma, Tianjiao; Chen, Wen; Chen, Shangfeng; Garfinkel, Chaim I.; Ding, Shuoyi; Song, Lei; Li, Zhibo; Tang, Yulian; Huangfu, Jingliang; Gong, Hainan; Zhao, Wei

doi:10.1175/jcli-d-21-0805.1

Cited by 20 publications

(26 citation statements)

References 60 publications

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“…The North wave train induces an anticyclone formed in the North China, and the South wave train induces a cyclone in the South China. The South wave train is mainly affected by the precipitation anomaly in the eastern Indian Ocean/western Pacific through a double Walker circulation induced by ENSO, which is helpful to the formation of the South wave train (Ma et al, 2022). The North wave train is jointly affected by ENSO, the sea surface temperature over the Labrador Sea and the preceding sea ice over the Kara Sea.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…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. However, ENSO may indirectly have an effect on the North wave train because ENSO can affect the SST over the remote North Atlantic through the effects of atmospheric bridge, which in turn spreads its influences on the East Asian climate.…”

Section: Figurementioning

confidence: 99%

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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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Section: Conclusion and Discussionmentioning

confidence: 99%

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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“…Zhao et al (2022) showed that the impact of ENSO on haze pollution over the Beijing-Tianjin-Hebei region is strong in early winter while weak in late winter. Ma et al (2022) further showed that the ENSO-induced anomalous southerly winds along the East Asian coast can extent to mid-and-high latitudes in early winter, whereas those anomalous winds are confined to the subtropics in late winter. Figure 2 shows the 500-hPa geopotential height anomalies over East Asia are distinct different in the early and late winter of the ENSO events.…”

Section: Sub-seasonal Changes In Enso's Signal Over East Asiamentioning

confidence: 93%

“…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). They suggested that precipitation anomalies in the tropical Indian Ocean that associated with ENSO played a crucial role.…”

Section: Possible Mechanismsmentioning

confidence: 99%

“…Accumulating evidence has shown that the impacts of ENSO on the EAWM have clear sub-seasonal changes, with stronger impacts during early winter (Nov-Dec) and weaker impacts during late winter (Jan-Feb) (Son et al, 2014;Kim et al, 2018;Tian and Fan, 2020;Li et al, 2021;Ma et al, 2022;Zhao et al, 2022). For example, Son et al (2014) reported that the impacts of ENSO on precipitation in Korea is strong in early winter and weak in late winter.…”

Section: Sub-seasonal Changes In Enso's Signal Over East Asiamentioning

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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An underlying factor of increasing early winter precipitation in the Hokuriku region of Japan in recent decades

Takemura,

Maeda,

Kawamura

2024

Atmospheric Science Letters

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Using a reanalysis dataset and large‐ensemble simulation results, this study examines a possible factor of increasing trend in early winter precipitation in recent decades in the Hokuriku region of Japan. Monthly precipitation in December has a significant increasing trend after the early 1990s, which is different from those in January and February. The increasing precipitation in December is related to that in the sea surface upward latent heat flux due to intensified winter monsoon circulation and warming sea surface temperatures (SSTs) over the Sea of Japan. December averaged SSTs show a trend pattern in recent decades that is similar to the negative phase of the interdecadal Pacific oscillation (IPO), accompanied by positive trends from the eastern Indian Ocean to the western tropical Pacific. The enhanced trend of convection over the Bay of Bengal is seen; suggesting a combined effect of climatologically high SSTs and IPO‐related warmed SSTs over the region. Trends in recent decades of an upper‐level wavy pattern from South Asia to near Japan along the subtropical jet associated with enhanced convection near the Bay of Bengal and the related pressure drop from Japan to the north are seen, which contribute to intensified winter monsoon circulation.

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Different ENSO Teleconnections over East Asia in Early and Late Winter: Role of Precipitation Anomalies in the Tropical Indian Ocean and Far Western Pacific

Cited by 20 publications

References 60 publications

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

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

An underlying factor of increasing early winter precipitation in the Hokuriku region of Japan in recent decades

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