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  • Author or Editor: Wen Zhou x
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Yanlian Zhou, Weimin Ju, Xiaomin Sun, Xuefa Wen, and Dexin Guan

Abstract

Aerodynamic roughness length z om is an important parameter for reliably simulating surface fluxes. It varies with wind speed, atmospheric stratification, terrain, and other factors. However, it is usually considered a constant. It is known that uncertainties in z om result in latent heat flux (LE) simulation errors, since z om links LE with aerodynamic resistance. The effects of z om on sensible heat flux (SH) simulation are usually neglected because there is no direct link between the two. By comparing SH simulations with three types of z om inputs, it is found that allowing z om temporal variation in an SH simulation model significantly improves agreement between simulated and measured SH and also decreases the sensitivity of the SH model to the heat transfer coefficient Ct, which in turn determines the linkage between z om and thermal roughness length z oh.

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Martin L. M. Wong, Johnny C. L. Chan, and Wen Zhou

Abstract

The intensity change of past (1976–2005) tropical cyclones that made landfall along the south China coast (110.5°–117.5°E) is examined in this study using the best-track data from the Hong Kong Observatory. The change in the central pressure deficit (environmental pressure minus central pressure) and maximum surface wind after landfall are found to fit fairly well with an exponential decay model. Of the various potential predictors, the landfall intensity, landward speed, and excess of 850-hPa moist static energy have significant influence on the decay rates. Prediction equations for the exponential decay constants are developed based on these predictors.

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