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Early Student Support for a Process Study of Oceanic Responses to Typhoons.
| 题名： | Early Student Support for a Process Study of Oceanic Responses to Typhoons. |
| 作者： | Lien, R. |
| 关键词： | Coefficients, Data analysis, Hurricanes, Linear momentum, Measurement, Models, Momentum, Sea water, Stresses, Wind, Boundary layer, Cyclones, Frequency, Wave propagation, Physics laboratories, Enthalpy, Oceans, Surface waves, Wind stress, Tropical cyclones |
| 摘要： | Drag coefficients beneath Typhoon Megi in the western Pacific are computed using velocity measurements made by EMAPEX floats, andmeasurements of the 10m wind. Downwind drag coefficients increase to 3.70.2 x 103 at 31 m/s, a value greater than most previousestimates, but decrease to 1.80.1 x 103 for wind speeds > 45 m/s, in agreement with previous estimates. At wind speeds 3045 m/s,significant crosswind wind stress is found such that the wind stress vector is about 20 degree clockwise from the 10m wind vector. Thismethod is applied to five sets of EMAPEX float measurements taken under 5 different tropical cyclones. In all cases, the surface windstress vector rotates clockwise from the 10m wind vector. The largest downwind drag coefficient occurs in the frontright sector of themoving storms. The variation of drag coefficient is explained by the variation of wave breaking under different wave forcing regimes.Surface wave peak frequency and significant wave height under Typhoon Fanapi are computed using float measurements assumingJONSWAP spectrum. Float estimates of peak frequency are 1020 less than WAVEWATCH III (ww3) model results, and differences ofsignificant wave height between float estimates and ww3 results are mostly < 2 m. |
| 报告类型： | 科技报告 |
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