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題 名 | Turbulence Measurements of Wind, Temperature and Humidity Over the Ocean=海洋上的風速、氣溫與溼度之紊流觀測 |
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作 者 | 曾若玄; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 22:1 1998.01[民87.01] |
頁 次 | 頁8-16 |
分類號 | 328 |
關鍵詞 | 海洋; 風速; 氣溫; 溼度; Turbulence level; Stability parameter; Transfer coefficient; |
語 文 | 英文(English) |
中文摘要 | 本文利用海研三號研究船行駛於臺灣海峽南部以及臺中外海的一座淺水平臺上觀 測風速、氣溫和溼度的紊流特性。結果發現水平順風的紊流強度和陣風係數均不隨風速而改 變,卻似乎隨著表面粗糙長度的增加而遞增。在不穩定的大氣條件下,熱和溼度紊流強度為 穩定參數 Z/L 的函數,其中 Z 為儀器高度,L 為莫寧 - 歐布霍夫長度。 由風速、氣溫與 溼度變動量之能譜分佈可證實慣性領域的存在,以慣性消散法求得之風應力略大於渦流相關 法所求得之值,本文所得到的動量、熱量和水汽傳送係數隨著風速和穩定度而變,並提出了 一些經驗公式和數值。 |
英文摘要 | Turbulent properties of wind velocities, air temperature and humidity were measured onboard the R/V Oceabn Researcher Ⅲ over the southern Taiwan Strait and on an offshore platform in shallow waters near Taichung. The longitudinal wind turbulence level and gust factor were found to remain constant at different wind speeds, but these values appeared to increase as the surface roughness increased. Thermal and humidity turbulence levels under unstable conditions depended on the stability parameter |Z/L|, where Z is the measurement height and L the Monin-Obukhov length. Spectra of wind speed, air temperature and humidity fluctuations showed the existence of an intertial subrange. Wind stress derived using the inertial-dissipation method was somewhat larger than that obtained using the eddy-correlation method. Transfer coefficients of momentum, heat and water vapor, were found to be functions of wind speed and stability parameter, and their empirical formulae and relationships are presented in this paper. |
本系統中英文摘要資訊取自各篇刊載內容。