A New Look at the Binary Interaction: Potential Vorticity Diagnosis of the Unusual Southward Movement of Tropical Storm Bopha (2000) and Its Interaction with Supertyphoon Saomai (2000)

Wu, Chun‐Chieh; Huang, Tung-Tsun; Huang, Wei-Peng; Chou, Kun-Hsuan

doi:10.1175/1520-0493(2003)131<1289:anlatb>2.0.co;2

Cited by 71 publications

(84 citation statements)

References 30 publications

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“…At the same time, another weaker typhoon, Goni, formed at 1200 UTC 03 August, circled cyclonically over the Hainan Island region. There seems to be a Fujiwhara effect (Lander and Holland 1993;Wu et al 2003) between these two typhoons. Goni eventually weakened mostly due to the intense environmental vertical shear over the northern South China Sea.…”

Section: Overview Of Typhoon Morakotmentioning

confidence: 91%

Rainfall Simulations of Typhoon Morakot with Controlled Translation Speed Based on EnKF Data Assimilation

Yen¹,

Lien³

2011

Terr. Atmos. Ocean. Sci.

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Typhoon Morakot produced record-breaking accumulated rainfall over southern Taiwan in August 2009. The combination of several factors resulted in this extreme weather event: the steep terrain in Taiwan, the prevailing south-westerly flow in the monsoon trough, Typhoon Goni over the northern South China Sea, and the slow translation speed of Morakot itself over Taiwan. In this study, the influence of the translation speed is particularly emphasized. Based on the EnKF data assimilation, an innovative method is applied to perform ensemble simulations with several designated translation speeds of Morakot using the WRF model. Thus the influence of the translation speed on the amount of accumulated rainfall over Taiwan can be quantitatively evaluated. In the control simulation with observed translation speed, the maximum amount and geographic pattern of accumulated rainfall during the landfall period of Morakot are generally consistent with the observations, though the detailed overall distributions of accumulated rainfall is mostly underestimated, resulting in the low bias of the frequency distribution of the accumulated rainfall. In a simulation with nearly-doubled translation speed of Morakot, the maximum accumulated rainfall is decreased by 33% than that in the control simulation, while the rainfall distribution over Taiwan remains similar. In addition, the 28 ensemble members can further provide additional information in terms of their spread and other statistics. The results from ensemble members reveal the usefulness of ensemble simulations for the quantitative precipitation forecast.

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Section: Overview Of Typhoon Morakotmentioning

confidence: 91%

Rainfall Simulations of Typhoon Morakot with Controlled Translation Speed Based on EnKF Data Assimilation

Yen¹,

Lien³

2011

Terr. Atmos. Ocean. Sci.

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“…As we have previously studied the TCs in the East China seas, four unusual left-turning TCs have been identified in the literature. In this paper, we will study four TC pairs in the East China seas, which have been documented in previous studies (Wu et al 2003;Yang et al 2008;Wu et al 2012;Xu et al 2013). Among them, two TC pairs were investigated by complex model experiments and another two were studied using potential vorticity diagnosis.…”

Section: Introductionmentioning

confidence: 93%

“…The third type of unusual TC tracks is the binary interaction of two nearby TCs in the NW Pacific. The short-term (2-3 days) track prediction of this type of TC is still difficult in practice (Wu et al 2003;Yang et al 2008;Wu et al 2012;Xu et al 2013;Bai et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Reexamining the Binary Interaction of Four Pairs of Tropical Cyclones in the Northwest Pacific

Qian

Huang

Zhang

2016

Journal of the Meteorological Society of Japan

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Four pairs of tropical cyclones (TCs) in the vicinity of the Northwest (NW) Pacific have been restudied in this paper by decomposing a total flow into a climatic component and an anomaly as well as by a simple generalized beta-advection model (GBAM). These results contradict with previous reports that binary interactions occurred in the four pairs of TCs. The intensities of the TC pairs were not well matched to each other during their common lifetime period; thus, the result of GBAM revealed that the strong TC had a direct influence on the track of the weak TC, but the reverse was not true. All dynamical models for studying the binary interaction of two adjacent TCs depend on how to separate the TC vortex and surrounding flow from the total flow. In this paper, the anomalous component can be directly used to measure the intensities and sizes of TCs and other adjacent disturbances. The track of TC as an anomalous vortex is influenced by the climatic steering flow and interacts with other anomalous systems in the vicinity. Whether a binary interaction happens between two TCs and whether the two TCs interact with other anomalous systems can be determined by the GBAM at the optimal level near the maximum center of the vorticity anomaly.

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“…Subsequently, on August 21-22, LionRock displayed the Fujiwhara effect with Typhoon Mindulle and continued to move 4 of 18 southward. The Fujiwhara effect occurs when cyclones are in proximity to one another; their centers will begin orbiting cyclonically about a point between the two systems due to their cyclonic wind circulations [31] LionRock caused a certain degree of cooling (>2 °C) in a large area of the sea path ( Figure 2). The cooling of the right side of the path was more obvious than that of the left side, and the cooling was greatest at the turning point of the typhoon path and when the typhoon wind speed was greater than 5 K. The cooling area at the turning point of the typhoon path was concentrated in a circular area.…”

Section: Lionrockmentioning

confidence: 99%

Impact of Major Typhoons on Sea Surface Environment in the Northwestern Pacific Derived from Satellite Remote Sensing

Song¹,

Guo²,

Duan³

et al. 2018

Preprint

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Studying the interaction between the upper ocean and the typhoons is crucial to improve our understanding of heat and momentum exchange between the ocean and the atmosphere. In recent years, the upper ocean responses to typhoons have received considerable attention. The sea surface cooling (SSC) process has been repeatedly discussed. In the present work, case studies were examined on five strong and super typhoons that occurred in 2016-LionRock, 1610; Meranti, 1614; Malakas, 1616; Megi, 1617; and Chaba 1618-to search for more evidence and new features of typhoon's impact on the sea surface environment. The typhoon monitoring data from the Central Meteorological Observatory, the sea surface temperature (SST) data from satellite microwave and infrared remote sensing, and the sea surface height anomaly (SSHA) data from satellite altimeters were used to analyze in detail: the SSC features caused by typhoons, the relationship between the SSC and the typhoon travelling speed, and the variations in cold and warm eddies during typhoon passage. Results showed that: (1) SSC generally occurred during typhoon passage and the degree of SSC was always determined by the strength and the travelling speed of the typhoon, as well as the initial SST. (2) One day before or on the day of typhoon passage, the SSHA slightly increased due to low surface pressure. After the typhoon passed, the SSHA obviously decreased along with the SSC. The pre-existing positive SSHAs, which always represent warm eddies, decreased or disappeared during typhoon passage, whereas negative SSHAs or cold eddies were enhanced. (3) New cold eddies were generated, especially at the turning points of the typhoon path. The presence of warm eddies is suggested to have a strengthening effect on the typhoons.

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A New Look at the Binary Interaction: Potential Vorticity Diagnosis of the Unusual Southward Movement of Tropical Storm Bopha (2000) and Its Interaction with Supertyphoon Saomai (2000)

Cited by 71 publications

References 30 publications

Rainfall Simulations of Typhoon Morakot with Controlled Translation Speed Based on EnKF Data Assimilation

Rainfall Simulations of Typhoon Morakot with Controlled Translation Speed Based on EnKF Data Assimilation

Reexamining the Binary Interaction of Four Pairs of Tropical Cyclones in the Northwest Pacific

Impact of Major Typhoons on Sea Surface Environment in the Northwestern Pacific Derived from Satellite Remote Sensing

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