Tropical cyclone genesis over the south China sea

Wang, Guihua; Su, Jilan; Ding, Yihui; Chen, Dake

doi:10.1016/j.jmarsys.2006.12.002

Cited by 182 publications

(127 citation statements)

References 16 publications

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“…Thus, about two-third of seed perturbations come from outside of the SCS, mostly east of Philippines. This result is obviously different from the results presented by Liang (1995) and Wang et al (2007b), they suggested that the most disturbances come from the SCS itself. The main reason may be that Liang (1995) and Wang et al (2007b) judged the origination of TC mainly depending on the TC best track data.…”

Section: Cyclogenesis Associated With Otherscontrasting

confidence: 94%

“…This result is obviously different from the results presented by Liang (1995) and Wang et al (2007b), they suggested that the most disturbances come from the SCS itself. The main reason may be that Liang (1995) and Wang et al (2007b) judged the origination of TC mainly depending on the TC best track data. But from synoptic-scale perturbation, the majority of precursor disturbances can be traced back to earlier.…”

Section: Cyclogenesis Associated With Otherscontrasting

confidence: 94%

“…Owing to the different statistical period, this statistical result may be slightly different from previous results (e.g. Liang, 1995;Wang et al, 2007b). To identify precursor synoptic perturbation type, daily synoptic-scale maps of low-level winds (derived based on 3-to 10-day band-pass filtered data) 7 days prior to TC genesis are examined for each TC.…”

Section: Six Types Of Precursor Synoptic Disturbances Associated Withmentioning

confidence: 72%

“…Studies showed that TC in the WNP can form in all the months, whereas almost no TC formation occurred in the SCS from January to March (e.g. Liang, 1995;Wang et al, 2007b;Yuan et al, 2007). For TC genesis in the SCS, Liang (1995) suggested that TC initial disturbances originate from four types, and they are intertropical convergence zone disturbance, trade wind disturbance, monsoon disturbance, and baroclinic disturbance.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, TC genesis in the SCS is related to the summer monsoon, the winter monsoon, and the coastal mountain (e.g. Wang et al, 2007aWang et al, , 2007b. Borneo vortex (BV) often formed off the coast of the Borneo Island during Northern Hemisphere winter monsoon, and it is also a seed disturbance for TCs in the SCS (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Precursor synoptic‐scale disturbances associated with tropical cyclogenesis in the South China Sea during 2000–2011

Yuan

Wang

2014

Int. J. Climatol

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Precursor synoptic disturbance characteristics associated with 35 tropical cyclone (TC) genesis events in the South China Sea (SCS) during 2000-2011 were examined. All genesis events occurred between May and December. Six types of precursor synoptic disturbances are identified, and their low-level composite patterns are constructed. They are synoptic-scale wave train (29%), TC energy dispersion (14%), Pacific easterly wave (9%), Borneo vortex (11%), TC southwesterly shear induced vortex (23%), and others (14%). In 13 (22) of 35 genesis cases, precursor perturbations originated within (outside of) the SCS.The satellite IR image data are used to analyse mesoscale convective activity prior to TC genesis. It is found that mesoscale convective systems were observed at 83% of the genesis cases, whereas 54% of the genesis cases experienced multiple mesoscale convective system development at a single time.Most of synoptic disturbances associated with the tropical cyclogenesis occurred in the region where atmospheric quasi-biweekly oscillation (QBW) and Madden-Julian oscillation (MJO) modes are in an active phase. The synoptic disturbances-associated TC genesis events in the SCS are strongly modulated by atmospheric low-frequency oscillations (especially the MJO). Meanwhile, favourable precursor sea surface temperature signals are observed, primarily on the 10-to 20-day and 20-to 90-day timescales.

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Section: Cyclogenesis Associated With Otherscontrasting

confidence: 94%

Section: Cyclogenesis Associated With Otherscontrasting

confidence: 94%

Section: Six Types Of Precursor Synoptic Disturbances Associated Withmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precursor synoptic‐scale disturbances associated with tropical cyclogenesis in the South China Sea during 2000–2011

Yuan

Wang

2014

Int. J. Climatol

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Observed upper ocean response to typhoon Megi (2010) in the Northern South China Sea

Guan

Zhao

Huthnance

et al. 2014

J. Geophys. Res. Oceans

131

117

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Typhoon Megi passed between two subsurface moorings in the northern South China Sea in October 2010 and the upper ocean thermal and dynamical response with strong internal tides present was examined in detail. The entire observed water column (60-360 m) was cooled due to strong Ekmanpumped upwelling (up to 50 m in the thermocline) by Megi, with maximum cooling of 4.2 C occurring in thermocline. A relatively weak (maximum amplitude of 0.4 m s 21 ) and quickly damped (e-folding time scale of 2 inertial periods) near-inertial oscillation (NIO) was observed in the mixed layer. Power spectrum and wavelet analyses both indicated an energy peak appearing at exactly the sum frequency fD1 (with maximum amplitude up to 0.2 m s 21 ) of NIO (f) and diurnal tide (D1), indicating enhanced nonlinear wave-wave interaction between f and D1 during and after typhoon. Numerical experiments suggested that energy transfer from NIO to fD1 via nonlinear interaction between f and D1 may have limited the growth and accelerated the damping of mixed layer NIO generated by Megi. The occurrence of fD1 had a high correlation with NIO; the vertical nonlinear momentum term, associated with the vertical shear of NIO and vertical velocity of D1 or vertical shear of D1 and vertical velocity of NIO, was more than 10 times larger than the horizontal terms and was responsible for forcing fD1. After Megi, surface-layer diurnal energy was enhanced by up to 100%, attributed to the combined effect of the increased surface-layer stratification and additional Megi-forced diurnal current.

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Decadal change of South China Sea tropical cyclone activity in mid‐1990s and its possible linkage with intraseasonal variability

et al. 2014

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This study focuses on the decadal variability of tropical cyclone (TC) activity over the South China Sea (SCS) since the 1970s and its possible cause behind. It is found that TC activity over the SCS experiences a significant decadal change around the mid-1990s. Compared to the period from the 1970s to the early 1990s, the number of TCs formed in the SCS remarkably increases from the mid-1990s through the 2000s. In particular, this change of TC genesis is closely related to a decadal shift in atmospheric intraseasonal variability (ISV) that occurred in 1994. The ISV on the 30-60 days time scale over the SCS has been increasing since the mid-1990s, and the increased TC frequency after 1994 is attributed primarily to the active convection induced by the enhancement of the SCS ISV. In addition, the TC activities before the mid-1990s are mostly confined within the SCS basin. However, more TCs form over the SCS and move northeastward since the mid-1990s and finally enter the East China Sea and the Philippine Sea. Anomalies of westerly over the northern SCS after 1994 are responsible for the northeastward moving of TCs.

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Tropical cyclone genesis over the south China sea

Cited by 182 publications

References 16 publications

Precursor synoptic‐scale disturbances associated with tropical cyclogenesis in the South China Sea during 2000–2011

Precursor synoptic‐scale disturbances associated with tropical cyclogenesis in the South China Sea during 2000–2011

Observed upper ocean response to typhoon Megi (2010) in the Northern South China Sea

Decadal change of South China Sea tropical cyclone activity in mid‐1990s and its possible linkage with intraseasonal variability

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