Numerical Analysis on the Effects of Binary Interaction between Typhoons Tembin and Bolaven in 2012

Abstract

e binary interaction is one of the most challenging factors to improve the forecast accuracy of multiple tropical cyclones (TCs) in close vicinity. e effect of binary interaction usually results in anomalous track and variable intensity of TCs. A typical interaction type, one-way influence mode, has been investigated by many studies which mainly focused on the anomalous track and recordbreaking precipitation, such as typhoons Morakot and Goni. In this paper, a typical case of this type, typhoons Tembin and Bolaven, occurred in the western North Pacific in August 2012, was selected to study how one typhoon impacts the track and intensity of the other one. e vortex of Tembin or Bolaven and the monsoon circulation were removed by a TC bogus scheme and a low-pass Lanczos filter, respectively, to carry out the numerical experiments. e results show that the presence of monsoon made the binary interaction more complex by affecting the tracks and the translation speeds of the TCs. e influence of Bolaven on the track of Tembin was more significant than the influence of Tembin on the track of Bolaven, and the looping track of Tembin was also affected by the external surrounding circulation associated with Bolaven. e absence of Tembin was not conducive to the development of Bolaven due to stronger vertical wind shear condition and the less kinetic energy being transported to upper troposphere. Note that the above analysis demonstrates the interacting processes between TCs and sheds some light on the prediction of binary TCs.

Assessment of FY‐2G Atmospheric Motion Vector Data and Assimilating Impacts on Typhoon Forecasts

“…Many studies have demonstrated that the motion of tropical cyclones has the best correlation with environmental steering flows (Carr & Elsberry, 1990; Chan & Gray, 1982; Xian & Chen, 2019). Figure 11 shows the Western Pacific subtropical high (WPSH, denoted by the characteristic line: 588 dagpm) at 500 hPa and the track of Typhoon Hato.…”

Sensitivity of precipitation and structure of Typhoon Hato to bulk and explicit spectral bin microphysics schemes

“…is study used WRF version 3.6.1 to simulate Typhoon Hato by performing 60 h integrations that were initialized at 1200 UTC on August 21, 2017, and ended at 0000 UTC on August 24, 2017. e initial 12 h period was treated as the model spin-up time. As shown in Figure 1, the simulation incorporated two nested domains: d01 and d02, [32][33][34]; however, no cumulus parameterization scheme was used for domain d02 because updrafts can be resolved sufficiently at 3 km resolution, resulting in explicit convective vertical transport [1]. Long and shortwave radiation was computed using the Rapid Radiative Transfer Model for global climate models [35][36][37].…”

Sensitivity of Precipitation and Structure of Typhoon Hato to Bulk and Explicit Spectral Bin Microphysics Schemes

“…None of the four experiments included assimilated observational data. Domain d01 used the Kain-Fritsch cumulus parameterization scheme [32][33][34]; however, no cumulus parameterization scheme was used for domain d02 because updrafts can be resolved sufficiently at 3 km resolution, resulting in explicit convective vertical transport [1]. Long and shortwave radiation was computed using the Rapid Radiative Transfer Model for global climate models [35][36][37].…”

“…Long and shortwave radiation was computed using the Rapid Radiative Transfer Model for global climate models [35][36][37]. Boundary layer processes were parameterized using the Yonsei University planetary boundary layer scheme [33,36,38]. For the surface layer option, the revised MM5 Monin-Obukhov scheme was selected.…”