An Observational Study of Typhoon Talim over the Northern Part of the South China Sea in July 2023

He, Junyi; Li, Qiusheng; Chan, Pak Wai; Choy, Chun Wing; Mak, Betty; Lam, Charles; Luo, Hong

doi:10.20944/preprints202308.0713.v1

2023

DOI: 10.20944/preprints202308.0713.v1

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An Observational Study of Typhoon Talim over the Northern Part of the South China Sea in July 2023

Junyi He¹,

Qiusheng Li²,

Pak Wai Chan³

et al.

Abstract: Extensive surface and upper air measurements of a typhoon over the northern part of the South China Sea, namely, Typhoon Talim in July 2023, are documented and analyzed in this paper. A number of features have been observed from the upper air measurements. First, the log law and the power law are found to be appropriate in fitting the wind profiles of the typhoon in the first 1000 m or so above the sea surface. A low level jet is observed in the lower troposphere from the observations of the radar wind profile… Show more

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Cited by 2 publications

References 27 publications

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Super Typhoon Saola (2023) over the Northern Part of the South China Sea—Aircraft Data Analysis

He,

Chan,

Chan

et al. 2023

Atmosphere

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In situ aircraft observations in typhoons have been scarce. This paper documents and analyses the aircraft and dropsonde data collected in Super Typhoon Saola (2023) over the northern part of the South China Sea. The wind and turbulence structures of the typhoon are investigated. The turbulence intensities are quantified in terms of turbulent kinetic energy (TKE) and eddy dissipate rate (EDR), and these data are compared with other available estimates of turbulence intensities, such as those based on weather radars, meteorological satellites, and numerical weather prediction (NWP) models. It is found that the TKE and EDR are closely correlated, and they are consistent with the weather radar/satellite observations as well as NWP-based outputs. Furthermore, the boundary layer inflow, vertical wind profiles, and atmospheric stability are analysed based on the dropsonde observations. The analysed results would advance the understanding of typhoon structures and offer references for the validation of remote-sensing observations and NWP models.

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Super Typhoon Saola (2023) over the Northern Part of the South China Sea—Aircraft Data Analysis

He,

Chan,

Chan

et al. 2023

Atmosphere

Self Cite

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Quality Assessment of ERA5 Wind Speed and Its Impact on Atmosphere Environment Using Radar Profiles along the Bohai Bay Coastline

Suo,

Sun,

Yan

et al. 2024

Atmosphere

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The accuracy of ERA5 reanalysis datasets and their applicability in the coastal area of Bohai Bay are crucial for weather forecasting and environmental protection research. However, synthesis evaluation of ERA5 in this region remains lacking. In this study, using a tropospheric wind profile radar (CFL-06L) placed in coastal Huanghua city, the deviations of ERA5 reanalysis data are assessed from the ground to an altitude of 5 km. The results indicate that the wind speed of ERA5 reanalysis data exhibits good consistency from the surface to the tropospheric level of about 5 km, with R2 values ranging from 0.5 to 0.85. The lowest mean wind speed error, less than 3 m/s, occurs in the middle layer, while larger errors are observed at the surface and upper layers. Specifically, at 150 m, the R2 is as low as 0.5, with numerous outliers around 5000 m. Seasonal analysis shows that the ERA5 wind field performs best in summer and worst in autumn and winter, especially at lower levels affected by circulation systems, high stratus clouds, and aerosols, with errors reaching up to 10 m/s. Further analysis of extreme weather events, such as heavy rain; hot, dry winds; and snowstorms, reveals that the effects of sea-land winds and strong convective systems significantly impact the observation of wind profiles and the assimilation of reanalysis data, particularly under the constrain of boundary layer height. Additionally, we also find that the transition of sea-land breeze is capable of triggering the nighttime low-level jet, thereby downward transporting the aloft ozone to the ground and resulting in an abnormal increase in the surface ozone concentration. The study provides a scientific basis for improving meteorological forecasting, optimizing wind energy resource utilization, and formulating environmental protection policies, highlighting its significant scientific and practical application value.

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An Observational Study of Typhoon Talim over the Northern Part of the South China Sea in July 2023

Cited by 2 publications

References 27 publications

Super Typhoon Saola (2023) over the Northern Part of the South China Sea—Aircraft Data Analysis

Super Typhoon Saola (2023) over the Northern Part of the South China Sea—Aircraft Data Analysis

Quality Assessment of ERA5 Wind Speed and Its Impact on Atmosphere Environment Using Radar Profiles along the Bohai Bay Coastline

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