Energetic processes regulating the strength of MJO circulation over the Maritime Continent during two types of El Niño

Hsu, Pang‐Chi; Fu, Zhen; Xiao, Ting

doi:10.1080/16742834.2018.1399049

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…The first one is the asymmetric effects of strong El Niño/La Niña conditions on the anomalous anticyclone over the WNP. Notwithstanding our preliminary results, several aspects of this question deserve further investigation, such as how important these asymmetric effects are for the interannual variability of winter climate extremes in East Asia and whether other factors play a role in these asymmetric effects except for the convective activity over the western tropical Pacific and the air‐sea interaction over the central‐northern Pacific (Feng & Wang, ; Guo et al, ; Hsu et al, ). The other question is the relationship between the SSTs in the North Atlantic and the synoptic‐scale wave activity along the M‐WA‐IT‐EC path during winter.…”

Section: Discussionmentioning

confidence: 91%

Climatic Condition and Synoptic Regimes of Two Intense Snowfall Events in Eastern China and Implications for Climate Variability

2019

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This study investigates the climatic condition and synoptic regimes of two intense snowfall events (ISEs) in central eastern China (CEC) during January 2018, focusing on the mechanisms of northerly cold advection and southerly water vapor transport. The northerly cold advections invading CEC were associated with a strengthened Siberian High, which could be partially attributed to an influence of reduced sea ice in the Kara Sea‐Barents Sea during November 2017 to January 2018 on a reduced meridional temperature gradient between the midlatitudinal Eurasia and Arctic regions. The southerly water vapor transport contributing to ISEs was associated with a zonal dipole pattern in the atmosphere, which was characterized by an anomalous anticyclone over the western North Pacific and an anomalous low over the Tibetan Plateau and India. The La Niña condition provided a climatic condition for an anomalous anticyclone persisting over the western North Pacific during January 2018, which was influenced by a strengthened convection over the western tropical Pacific and influenced by the air‐sea interaction over the central‐northern Pacific. The anomalous low over the Tibetan Plateau and India was associated with active eastward propagating synoptic‐scale waves originating from the midlatitudinal North Atlantic. The implication of aforementioned climatic conditions on climate variability was further discussed. Our results suggest that a reduced sea ice in the Kara Sea during the preceding late autumn and a concurrent La Niña‐like condition may contribute to an increased frequency of ISEs in CEC during winter on the interannual time scale.

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Section: Discussionmentioning

confidence: 91%

Climatic Condition and Synoptic Regimes of Two Intense Snowfall Events in Eastern China and Implications for Climate Variability

2019

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“…Thus, the anomalous westerly over the western Pacific amplify the zonal gradient of background zonal wind. Hsu et al (2018) indicate that the conversion of low-frequency kinetic energy of more than 90 days to MJO kinetic energy is proportionate to the zonal gradient of background zonal wind (-u ′2z u zx , "ˊ" and "−" are MJO scale and background wind). Therefore, the occurrence of background westerly anomaly over the western Pacific may lead to reinforcing the barotropic energy conversion from the low-frequency background field to the MJO scale, resulting in enhancing the activities of MJO zonal westerly.…”

Section: Possible Cause Of Anomalous Mjo Activitymentioning

confidence: 99%

“…However, the enhancement of the MJO in the central Pacific El Niño mainly occur in the mature and decaying stages of El Niño (Gushchina and Dewitte, 2012;Chen et al, 2016). During the central Pacific El Niño, the anomalous circulation and moisture over the maritime continent and western Pacific are conductive to the increase of moist static energy and the conversion from barotropic and baroclinic energy from the low-frequency background field to MJO scale, thus strengthening the MJO activity in these regions (Hsu et al, 2018;Wang et al, 2018). The horizontal and vertical moisture advection over the central Pacific is stronger during the central Pacific El Niño compared with during the eastern Pacific El Niño, resulting in the stronger intensity and the furtherer eastward propagation of the MJO during the central Pacific El Niño (Chen et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Madden-Julian oscillation in three super El Niño events

Chen²,

Li³

et al. 2023

Front. Earth Sci.

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This paper investigated the characteristics of Madden-Julian Oscillation (MJO) in three super El Niño events (i.e., 1982/83, 1997/98 and 2015/16 El Niño events) based on reanalysis data. MJO with apparent eastward propagation can be observed during the developing stages of these three super El Niño events. Enhanced MJO zonal wind was observed over the western Pacific, especially in 1997/98 and 2015/16 El Niño events, which is mainly attributed to the effects of tropical background circulation and extratropical anomalous circulation. During the mature stages of 1982/83 and 1997/98 El Niño events, MJO with noticeable eastward propagation cannot be observed, and the MJO zonal wind amplitude at 850 hPa was weakened (enhanced) over the Indian Ocean and western Pacific (central and eastern Pacific). However, MJO zonal wind amplitude over the central and eastern Pacific was enhanced and the prominent eastward propagation was also found in the mature stage of 2015/16 El Niño. The eastward propagation of MJO was also observed during the decaying stages of the three super El Niño events, but its intensity was weaker compared with the developing and mature stages. The abnormal activity of MJO during the mature and decaying stages may be closely related to the characteristics in circulation and moisture anomalies caused by El Niño and the seasonal cycle of circulation and moisture. In addition, this study found that the RMM index and MJO zonal wind amplitude may lead to contradictory results in identifying the characteristics of MJO activity, especially during the developing and decaying stages.

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A Case Study on MJO Energy Transport Path in a Local Multi-scale Interaction Framework

et al. 2021

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Energetic processes regulating the strength of MJO circulation over the Maritime Continent during two types of El Niño

Abstract: science & technology, nanjing, china; c collaborative innovation center on Forecast and evaluation of meteorological disasters, nanjing University of information science & technology, nanjing, china; d Guangzhou meteorological observatory, Guangzhou, china

Cited by 8 publications

References 37 publications

Climatic Condition and Synoptic Regimes of Two Intense Snowfall Events in Eastern China and Implications for Climate Variability

Climatic Condition and Synoptic Regimes of Two Intense Snowfall Events in Eastern China and Implications for Climate Variability

Comparison of Madden-Julian oscillation in three super El Niño events

A Case Study on MJO Energy Transport Path in a Local Multi-scale Interaction Framework

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