Multiscale control of summertime persistent heavy precipitation events over South China in association with synoptic, intraseasonal, and low-frequency background

Li, Richard C. Y.; Zhou, Wen

doi:10.1007/s00382-014-2347-6

Cited by 43 publications

(29 citation statements)

References 40 publications

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“…Lowering the intensity threshold for daily teleconnection indices to 0.8 σ and 0.75 σ instead, will increase the percentages to 62% and 74%, respectively. Further considering the complexity and diversity of large‐scale circulations responsible for PPEs in this area (Chen and Zhai, ; Li and Zhou, ), this percentage punctuates the dominant role of these three teleconnections over other flow patterns in triggering PPEs.…”

Section: Discussionmentioning

confidence: 92%

Persistent precipitation extremes in the Yangtze River Valley prolonged by opportune configuration among atmospheric teleconnections

Chen

Zhai

Liao

et al. 2019

Quart J Royal Meteoro Soc

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This study investigates whether and how three synoptic-scale teleconnections, i.e. East Asia/Pacific teleconnection (EAP), Silk-Road teleconnection (SR) and Eurasia teleconnection (EU), induce persistent precipitation extremes (PPEs) in the Yangtze River Valley. Results show that only the EAP teleconnection has the potential of independently incurring PPEs; while the other two teleconnections' influences on PPEs need to be exerted via their liaison with the EAP pattern. Cases are accordingly grouped into two subsets, i.e. single EAP-PPEs and three teleconnection-PPEs. In both groups, the EAP teleconnection evolves following a similar pathway that poleward energy dispersion dynamically links a westward-extended subtropical high, a deepened midlatitude trough and the Okhotsk blocking. EAP-induced circulation anomalies enhance low-level convergences and upper-level divergences, convey exceptionally abundant moisture, and hence give birth to a quasi-stationary front leading to PPEs in the Yangtze River Valley. Despite similarities, PPEs last noticeably longer in the three-teleconnection context. The EU teleconnection-related downstream energy dispersion at higher latitudes favours both earlier establishment and latter decay of the Okhotsk blocking. Constructed meridional flows at mid-high latitudes continuously steer migratory disturbances southeastward into the EAP trough. The SR plays a bigger role during the latter half of PPE life span (3 days after onset) via stimulating new cyclonic disturbances that largely overlap with the EAP trough spatially. Moreover, EU-and SR-excited disturbances could effectively extract baroclinic and barotropic energy from local mean flows to replenish components of the EAP tripole pattern, which therefore survives longer and prolongs PPEs by several days. K E Y W O R D S monsoonal stationary front, persistent precipitation extremes, Rossby wave energy dispersion and conversion, synoptic-scale atmospheric teleconnections, thermodynamic-dynamic mechanisms Q J R Meteorol Soc. 2019;145:2603-2626. wileyonlinelibrary.com/journal/qj © 2019 Royal Meteorological Society 2603 2604 CHEN ET AL.

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Section: Discussionmentioning

confidence: 92%

Persistent precipitation extremes in the Yangtze River Valley prolonged by opportune configuration among atmospheric teleconnections

Chen

Zhai

Liao

et al. 2019

Quart J Royal Meteoro Soc

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“…The associated wet conditions to the south also weakened rapidly, with anomalous rainfall reducing to 6 mm/day by 26–30 July and to around only 3 mm/day by 31 July–4 August (Figure l). Therefore, the overall amplitude of the second Meiyu period was much smaller and the superimposed extreme precipitation events were much shorter (Chen and Zhai, ; Li and Zhou, ).…”

Section: Anomalous Yrv Rainfall During Summer 1998mentioning

confidence: 99%

The impact of interactions between tropical and midlatitude intraseasonal oscillations around the Tibetan Plateau on the 1998 Yangtze floods

Jian-ying

Mao

2018

Quart J Royal Meteoro Soc

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This study explores the dynamic processes on intraseasonal time‐scales responsible for the devastating floods over the Yangtze Basin during June–August 1998. Wavelet analysis suggests that the unusual double Meiyu episodes over the south of the middle and lower reaches of the Yangtze River valley (SMLY) depended on the 25–60‐day intraseasonal oscillation (ISO), which has an anomalous ascending branch over the SMLY and descending branch south of 20°N over eastern China. This vertical–meridional cell was not only regulated by the tropical ISO over the Asian summer monsoon region but also modulated by the midlatitude ISO in the upper troposphere. The intraseasonal Rossby wave train along the Asian westerly jet, presenting as the anomalous anticyclone over the Tibetan Plateau (TP) sandwiched between anomalous cyclones in the upstream and downstream areas, tended to trigger another reversed vertical–meridional cell with updraught over the SMLY and downdraught to the north through vorticity advection. The phase‐lock of these ascending branches over the SMLY produced the double Meiyu episodes. The duration of the SMLY flooding was also associated with the interactions between tropical and midlatitude ISOs. During the first wet episode, as the tropical ISO‐related upper‐level divergent flows propagated northward to the southwestern TP, they tended to anchor the anticyclone over the TP through their interaction with the midlatitude rotational circulation. This favoured persistent ascent over the SMLY, and thus the prolonged Meiyu episode in June. In contrast, the northward propagation was confined to the central Bay of Bengal in July, leading to a short Meiyu episode.

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“…Most previous studies on the LPR mainly focused on south China (Qian et al ., ; Yuan et al ., ; Li and Zhou, ; Huang et al ., ; Liu et al ., ), central eastern China (Chen and Zhai, ; ) and the YHRV (Chen and Zhai, ). These results indicated that the individual‐station‐based LPR in China mostly occurred in the YHRV, continually to the south of the Yangtze River and south China.…”

Section: Introductionmentioning

confidence: 99%

The decadal shift of the long persistent rainfall over the northern part of China and the associated ocean conditions

Yan

Huang

Zhu

et al. 2019

Intl Journal of Climatology

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The long persistent rainfall (LPR) over the northern part of China has a great impact on its society and economics. This study investigates the decadal shift of the regional‐mean LPR frequency over the northern part of China (LPR frequency) from 1971 to 2014 and the associated ocean conditions. The LPR frequency has experienced a significant decadal shift around 1996, with an enhanced (reduced) anomaly before (after) 1996, which is closely associated with a meridional tri‐pole sea surface temperature (SST) anomaly over the central Pacific, a La Niña‐like anomaly for the pre‐1996 epoch (1971–1996) and an obvious warming over the south Indian Ocean and the western part of south Pacific Ocean in the post‐1996 epoch (1997–2014). In the pre‐1996 epoch, associated with the typical SSTs, the ascent motion with increasing humidity anomalies are over the northern part of China. Meanwhile, high (low) pressure anomalies are over western Asia and East Asia (Europe and central Asia), which resembles as the positive phase of the Silk Road pattern (SRP). It would be associated with the polewards shift of the East Asian jet stream (EAJS) and therefore result in the northwards shift of the rain belt and benefit the occurrence of the LPR. In the post‐1996 epoch, associated with the warming over the specific south oceans, a descend anomaly dominates over the northern part of China, as well as the resembled negative phase of the SRP over mid‐high latitudes and equatorwards shift of the EAJS. These would suppress the rainfall over the northern part of China and reduce the LPR frequency over there after 1996.

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Multiscale control of summertime persistent heavy precipitation events over South China in association with synoptic, intraseasonal, and low-frequency background

Cited by 43 publications

References 40 publications

Persistent precipitation extremes in the Yangtze River Valley prolonged by opportune configuration among atmospheric teleconnections

Persistent precipitation extremes in the Yangtze River Valley prolonged by opportune configuration among atmospheric teleconnections

The impact of interactions between tropical and midlatitude intraseasonal oscillations around the Tibetan Plateau on the 1998 Yangtze floods

The decadal shift of the long persistent rainfall over the northern part of China and the associated ocean conditions

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