碩士 / 國立中山大學 / 海洋資源學系 / 84 / Shipboard observations of wind speed, air temperature, humidity
and sea-surface temperature were made during four cruises of R/
V Ocean Researcher III over southern Taiwan Strait between June
1995 and March 1996. Inertial dissipation method was used to
estimate turbulent fluxes of momentum, sensible and latent heat
(water vapor). Among the total 186 data runs, the range of wind
speed is 3.5∼15.8m/s , stability parameter Z/L is
-0.417∼0.197, and only 35 runs show stable condition . Spectra
of wind, temperature and humidity fluctuations show the
existence of the inertial subrange in the frequency band 0.5 ∼
10 Hz, where spectral slopes follow fand the condition
of local isotropy are satisfied. Under unstable conditions and
when wind speeds between 4.6∼15.8 m/s, the roughness length Z
increases nonlinearly with the wind speed. On the other
hand, Z (for heat) and Z(for moisture) remain constant. The
neutral drag coefficient at 10 m height, CDN, is well described
by 10CDN = 0.62 + 0.052U10, where U10 is the wind speed at
10m height. The Stanton number CTN and Dalton number CEN are
1.27± 0.15(T10) and 1.23±0.16(T10) respectively, and
CTN under unstable condition is larger than that under stable
condition. Wind stress is proportional to the 7/3 power of U10.
Sensible and latent heat flux increase linearly with U10(Ts- z)
and U10(Qs-Qz) respectively, where Ts is sea-surface
temperature, z and Qz are potential temperature and absolute
humidity, respectively at a height Z, Qs is absolute humidity
at sea surface. Comparison of simultaneous bulk and dissipation
method estimates of air-sea fluxes is generally within ±20%
deviation. Normalized thermal and humidity turbulence levels
under unstable conditions were found to be closely related to Z/
L.
| Identifer | oai:union.ndltd.org:TW/084NSYSU277010 |
| Date | January 1996 |
| Creators | Lin, Shoou-Jye, 林首杰 |
| Contributors | Tseng, Rou-Shan, 曾若玄 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 73 |
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