Relationship between the South China Sea summer monsoon onset and tropical cyclone genesis over the western North Pacific

Huangfu, Jingliang; Huang, Ronghui; Chen, Wen

doi:10.1002/joc.5141

Cited by 27 publications

(10 citation statements)

References 36 publications

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“…The average number of TC per year in the WNP since 1981 is 26 [79]. One of the striking features due to the formation of TCs in the WNP is that TCs resulted in strong westerly winds to the SCS [80]. Given that the BSL has significantly occurred in the condition of stronger westerly winds, this section is designed to understand whether the favorable condition is generated due to TC.…”

Section: The Relationship Between Tc and Bslmentioning

confidence: 99%

“…The circulation cells from the cyclogenesis intensified the monsoon westerly winds and extended them eastward. Due to the Coriolis force, most of the WNP TCs propagated in a north-westward direction as they reached the SCS [80]. With a north-westward track, TC transports strong westerly winds to the SCS, which then triggers the eastward retreat of the WNPSH and the intrusion of the south-westerly winds from the southern hemisphere through Peninsular Malaysia and Borneo terrain [80].…”

Section: The Relationship Between Tc and Bslmentioning

confidence: 99%

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Climatological Features of Squall Line at the Borneo Coastline during Southwest Monsoon

et al. 2022

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Borneo Squall Line (BSL) is a disaster risk associated with intense rain and wind gust that affect the activities and residence near the northern coast of Borneo. Using 3-hourly rainfall from Tropical Rainfall Measuring Mission (TRMM) 3B42V7 during southwest monsoon season (May–September) from 1998–2018, a total of 629 squall days were identified. Their monthly and annual average was 6 and 30 days, respectively, with July representing the month with the highest number of squall line days. BSL is frequently initiated during midnight/predawn and terminated in the morning. Composite analyses of BSL days using the daily winds from the European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim revealed that lower tropospheric wind convergence is a crucial controlling factor for BSL formation. The position of the monsoon trough closer to the equatorial South China Sea (SCS), and strong westerly and south-westerly winds played an important role in creating this wind convergence region. Analyses of tropical cyclone (TC) data from the Regional Specialized Meteorological Centre (RSMC), Tokyo showed that nearly 72% of BSL occurred with the presence of TC. Spectral analysis exhibited prominent frequencies mainly in the 3–4- and 6-year time scale, which likely reflected the influence of interannual modulation of El-Niño Southern Oscillation (ENSO). Correlation coefficient between squall days and Sea Surface Temperature (SST) anomalies indicated that BSL increased after La-Niña events. This study is expected to have implications for real-time squall line forecasting in Malaysia and contributes toward a better understanding of BSL.

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Section: The Relationship Between Tc and Bslmentioning

confidence: 99%

Section: The Relationship Between Tc and Bslmentioning

confidence: 99%

Climatological Features of Squall Line at the Borneo Coastline during Southwest Monsoon

et al. 2022

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“…However, our understanding of the synoptic‐scale wave train during the SCSSM withdrawal period is relatively deficient. According to previous studies, the SCSSM onset and withdrawal can result in the adjustment and shift of large‐scale general circulation patterns (Chen et al, 2019; Ding et al, 2015; Hu et al, 2018b; Hu, Chen, Huang, & Nath, 2019c; Huangfu, Huang, & Chen, 2017a; Wang, LinHo, & Lu, 2004; Wang et al, 2009; Zhou & Chan, 2005; Zhou, Chan, & Li, 2005). Climatologically, the SCSSM withdrawal is characterized by the weakening of low‐level monsoon trough and deceleration of upper‐level tropical easterly wind, as well as a significant decrease in moisture (Hu et al, 2019c).…”

Section: Introductionmentioning

confidence: 95%

South China Sea summer monsoon withdrawal and the synoptic‐scale wave train over the western North Pacific

Huangfu

Chen

et al. 2020

Intl Journal of Climatology

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Based on NCEP/NCAR reanalysis data (1951–2016), this study focuses on the in‐phase relationship between the South China Sea summer monsoon (SCSSM) withdrawal date and the strength of the synoptic‐scale wave train. The synoptic‐scale wave train during early autumn, which features northwest–southeast‐oriented cyclonic and anticyclonic anomalies, is the dominant synoptic mode over the tropical western North Pacific (WNP). The synoptic‐scale wave train is observed to be significantly strengthened (depressed) during the late (early) SCSSM withdrawal years. Concurrent with the late SCSSM withdrawal, the monsoon trough remains stronger than that in the early withdrawal years. The anomalous low‐level cyclone over the South China Sea favours the barotropic energy conversion from the mean flow to synoptic‐scale eddies. Moreover, the anomalous easterly wind shear over the SCS and the increased moisture over the tropical WNP provide a favourable environment for the development of the synoptic‐scale wave train. This study interprets the inner dynamics of tropic atmospheric activity based on a wave perspective. These results may suggest that synoptic‐scale wave train‐related tropical cyclone activity and precipitation are enhanced in the late SCSSM withdrawal years.

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“…As an important part of the EASM (Wang et al 2004), the variability and mechanism of the South China Sea summer monsoon (SCSSM) have been widely investigated based on datasets from the South China Sea Monsoon Experiment (SCSMEX) (Mao and Chan 2005, Zhou and Chan 2005, Wang et al 2009, Ding et al 2015, Huangfu et al 2017a, 2017b. For example, previous studies found a close connection between the thermal state of the tropical western Pacific and the onset date of the SCSSM from intraseasonal to interdecadal time scales (Huang et al 2006, Wang et al 2009, Huangfu et al 2015.…”

Section: Introductionmentioning

confidence: 99%

An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s

Yin

Huangfu

Zhou

2020

Environ. Res. Lett.

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In this study, the interdecadal change in the size of the Indo-Pacific warm pool (IPWP) and its connection with the intensity of the South China Sea summer monsoon (SCSSM) in May are investigated. The results show that the size of the IPWP experienced a marked interdecadal extension in the late 1980s, and its impacts on the SCSSM have also strengthened. Further analyses indicate that interdecadal changes in the connection between the IPWP and SCSSM variations are related to the changes in the atmospheric circulation anomalies over the tropical western Pacific due to the size of the IPWP. During 1951-1986, the IPWP was smaller than the climatologic size, which led to suppressed convection over the tropical western Pacific and easterly anomalies north of the equator. The Philippines and South China Sea (SCS) region was controlled by anomalous anticyclonic circulation, which was not conducive to the formation and development of the SCSSM. In contrast, during 1987-2018, the IPWP expanded significantly eastward. As a response to the IPWP size extension, convective activities were enhanced over the tropical western Pacific. Anomalous cyclonic circulation was located over the Philippines and SCS regions, which favored the enhancement of the SCSSM through wide westerly flow in the Bay of Bengal and tropical western Pacific. Moreover, it is shown that the interdecadally enhanced intraseasonal oscillations (ISOs) over the tropical western Pacific in the late 1980s also favored reinforcement of the SCSSM intensity.

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Relationship between the South China Sea summer monsoon onset and tropical cyclone genesis over the western North Pacific

Cited by 27 publications

References 36 publications

Climatological Features of Squall Line at the Borneo Coastline during Southwest Monsoon

Climatological Features of Squall Line at the Borneo Coastline during Southwest Monsoon

South China Sea summer monsoon withdrawal and the synoptic‐scale wave train over the western North Pacific

An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s

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