Momentum Transports Associated with Tropical Cyclone Recurvature

Li, Y. S.; Chan, Johnny C. L.

doi:10.1175/1520-0493(1999)127<1021:mtawtc>2.0.co;2

Cited by 9 publications

(10 citation statements)

References 9 publications

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“…In addition to the steering flow, thermodynamie processes such as diabatie heating affect TC motion, including TC recurvature (Li and Chan 1999;Wu and Wang 2000;Chan et al 2002). First, the basic framework for the analysis of TC landfalling is based on the steering flow concept.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part II: Tropical Cyclone Landfall

Zhang¹,

Leung²,

Chan³

2013

Journal of Applied Meteorology and Climatology

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This is the second paper of a two-part series of papers on the analysis of tropical cyclone (TC) tracks in the western North Pacific Ocean. In this paper, TC landfalls in the South China Sea and western North Pacific basins are investigated through the data-mining approach. On the basis of historical TC archives, the C4.5 algorithm, a classic tree algorithm for classification, has been employed to quantitatively discover rules governing TC landfall. A classification tree, with 14 leaf nodes, has been built. The path from the root node to each leaf node forms a rule. Fourteen rules governing TC landfall across the Chinese coast have been unraveled with respect to the selected attributes having potential influence on TC landfall. The rules are derived by the attributes and splitting values. From the classification tree, split values, such as 27°N latitude, 130°E longitude, 141°E in the west extension index, and 0.289 in the monsoon index have been shown to be useful for TC forecasting. The rules have been justified from the perspective of meteorology and knowledge of TC movement and recurvature (e.g., deep-layer mean winds and large-scale circulation). The research findings are also consistent with existing results concerning TC movement and landfall. Both the unraveled rules and the associated splitting values can provide useful references for the prediction of TC landfall over China. .J structure, mtenstty, and motion of the TC will change two-part paper, troptcal cyclone (TC) recurvature and ,

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Section: Conclusion and Discussionmentioning

confidence: 99%

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part II: Tropical Cyclone Landfall

Zhang¹,

Leung²,

Chan³

2013

Journal of Applied Meteorology and Climatology

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“…Baroclinic vortices move approximately with the environmental flow in the low-to midtropospheric layer (Holland and Wang 1995;Wang and Holland 1996b,c;Wang et al 1998). Changes in environmental flow associated with the recurvature are more related to the uppertropospheric flow than the lower-tropospheric flow (George and Gray 1977;Hodanish and Gray 1993;Li and Chan 1999). Different vertical averages are thus used to investigate the TC motion for the straight-moving Typhoon Ewiniar in LL and recurving Typhoon Maemi in UL.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Previous studies investigated interactions between the synoptic-scale circulations (westerly trough and subtropical ridge) and TCs with respect to the recurvature process (Hodanish and Gray 1993;Holland and Wang 1995). Eastward-retreating subtropical ridge and an approaching westerly trough are dominant environmental features during the recurvature (Li and Chan 1999). A comparison of the geopotential heights at 500 hPa between Typhoon Ewiniar ( Fig.…”

Section: Model Experiments and Methodologymentioning

confidence: 99%

“…As demonstrated by Yun et al (2012), the WN1 component of the PVT based on a LL average is fairly consistent with the movement of a TC. However, changes in environmental flow associated with the recurvature are more evident in uppertropospheric flow than in lower-tropospheric flow (George and Gray 1977;Hodanish and Gray 1993;Li and Chan 1999). In addition, asymmetric flow which affects TC motion depends on large-scale circulation (Chan and Cheung 1998).…”

Section: Potential Vorticity Tendency Frameworkmentioning

confidence: 99%

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Effects of Asymmetric SST Distribution on Straight-Moving Typhoon Ewiniar (2006) and Recurving Typhoon Maemi (2003)

Choi

Yun

et al. 2013

Monthly Weather Review

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The effects of asymmetric sea surface temperature (SST) distribution on the tropical cyclone (TC) motion around East Asia have been examined using the Weather Research and Forecasting Model for the straightmoving Typhoon Ewiniar (2006) and recurving Typhoon Maemi (2003). The SST-TC motion relationships associated with the two different TCs and the physical mechanism of recurvature are investigated in the context of the potential vorticity tendency framework. A zonally asymmetric SST distribution alters the TC translating direction and speed, which is ascribable to the interaction between a TC and the environmental current associated with asymmetric SST forcing. A north-south SST gradient has an insignificant role in the TC motion. It is noted that the straight-moving (i.e., northward moving) TC deflects toward the region of warmer SST when SST is zonally asymmetric. A contribution of the horizontal advection including asymmetric flow induced by asymmetric forcing is dominant for the deflection. The recurving TC reveals northeastward acceleration and deceleration after the recurvature point in the western warming (WW) and eastern warming (EW) experiments, respectively. When it comes to a strong southerly vertical wind shear under the recurvature condition, diabatic heating can be a significant physical process associated with the downward motion over the region of upshear right. The enhanced (reduced) southwesterly flow effectively produces the acceleration (deceleration) of northeastward movement in WW (EW) after recurvature.

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“…The recurving position of TCs is defined as the location where a TC reaches its westernmost point and shifts from northwestward to northeastward [ Choi et al , 2010; Li and Chan , 1999]. Nonrecurving TCs have been excluded from this analysis.…”

Section: Characteristics Of Wnp Tc Activity Associated With the Pj Pamentioning

confidence: 99%

Effects of the Pacific‐Japan teleconnection pattern on tropical cyclone activity and extreme precipitation events over the Korean peninsula

Kim

Zhou

2012

J. Geophys. Res.

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[1] In this study, an exploratory analysis was carried out to gain a better understanding of the potential impacts of the two phases (negative and positive) of the Pacific-Japan (PJ) pattern on tropical cyclone (TC) activity affecting the Korean Peninsula (KP) and TC-induced extreme precipitation events over five major river basins in Korea. The results show that large-scale atmospheric environments during the years in the positive PJ phase (referred to as positive PJ years) are more favorable for TC activity than those during the years in the negative PJ phase (referred to as negative PJ years). It is found that wind shear is weaker, rising motion is stronger, and relative humidity is higher over the KP in positive PJ years than in negative PJ years. TCs affecting the KP during positive (negative) PJ years tend to occur more to the southwest (northeast), recurve at locations more to the northwest (northeast), and show an increase (decrease) in frequency over Korea and Japan. As a result, TCs making landfall are found more often over southeastern South Korea during positive PJ years. Despite the relatively modest sample size used in this study, we expect that the results described herein will be useful in developing a critical support system for the effective reduction and mitigation of TC-caused disasters as well as for water supply management in coupled human and natural systems.

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Momentum Transports Associated with Tropical Cyclone Recurvature

Cited by 9 publications

References 9 publications

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part II: Tropical Cyclone Landfall

The Analysis of Tropical Cyclone Tracks in the Western North Pacific through Data Mining. Part II: Tropical Cyclone Landfall

Effects of Asymmetric SST Distribution on Straight-Moving Typhoon Ewiniar (2006) and Recurving Typhoon Maemi (2003)

Effects of the Pacific‐Japan teleconnection pattern on tropical cyclone activity and extreme precipitation events over the Korean peninsula

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