Abstract
The Weather Research and Forecasting model version 3.2 (WRF v3.2) was used with the bogus data assimilation (BDA) scheme and sea spray parameterization (SSP), and experiments were conducted to assess the impacts of the BDA and SSP on prediction of the typhoon ducting process induced by Typhoon Mindule (2004). The global positioning system (GPS) dropsonde observations were used for comparison.
The results show that typhoon ducts are likely to form in every direction around the typhoon center, with the main type of ducts being elevated duct. With the BDA scheme included in the model initialization, the model has a better performance in predicting the existence, distribution, and strength of typhoon ducts. This improvement is attributed to the positive effect of the BDA scheme on the typhoon’s ambient boundary layer structure.
Sea spray affects typhoon ducts mainly by changing the latent heat (LH) flux at the air-sea interface beyond 270 km from the typhoon center. The strength of the typhoon duct is enhanced when the boundary layer under this duct is cooled and moistened by the sea spray; otherwise, the typhoon duct is weakened. The sea spray induced changes in the air-sea sensible heat (SH) flux and LH flux are concentrated in the maximum wind speed area near the typhoon center, and the changes are significantly weakened with the increase of the radial range.
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Supported by the National Natural Science Foundation of China (41230421, 41205004, 41005029, and 41105065) and China Meteorological Administration Special Public Welfare Research Fund (GYHY201106004).
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Fei, J., Ding, J., Huang, X. et al. Numerical study on the impacts of the bogus data assimilation and sea spray parameterization on typhoon ducts. Acta Meteorol Sin 27, 308–321 (2013). https://doi.org/10.1007/s13351-013-0303-8
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DOI: https://doi.org/10.1007/s13351-013-0303-8