Past investigations were mostly concentrated on the upwelling phenomena observed in the coastal region caused by the variations of topography and the influences of monsoon and oceanic currents. These upwelling are the major sources known to form the plankton production in the surface layer. Remote sensing techniques have been developed very fast recent years, more profound phenomena could be observed at the sea surface. The biggest advantage of using satellite-scanning technique is that larger area can be observed than before and have fewer limitations by weather. Short-term upwelling, such as the storm generated upwelling, can be traced. Lin (2003) reported cold sea surface temperature regions along two typhoon tracks from satellite images. Sea surface cyclonic eddies can usually be observed at the region of typhoon where covered with depressions and strong winds. It is often the place where the upwelling also occurred. Snapshot of satellite images also shown plankton in surface water could grow very quickly after the typhoon left, since enough nutrients have been supplied from deep water. Due to the high water temperature and evaporation rate in the SCS, it is a well know region of energetic weathering system where typhoon occurs quite often. In order to quantify the upwelling processes and study the effects of after-typhoon bloom, a set of numerical studies have been carried out since in-situ measurements are nearly impossible to be implemented. A European community model, COHERENS, has been applied to model the hydrodynamics in the SCS. Slight modification of the code has been done in order to introduce the wind and the pressure field inside typhoon using a parametric typhoon model. In this paper, a series of idealized typhoon cases have been designed, i.e. using various depths, wind intensities and the speed of moving, to identify the influences to vertical structure of the sea water. Simulation of a real case, typhoon Kai-Tai occurred from 6 July to 10 July 2000, will also presented. The model domain is from 3¢XN to 29¢XN and 99¢XE to 125¢XE with a resolution of 1/6 degree. Cold-water upwelling can be observed from the model results.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0804104-101527 |
| Date | 04 August 2004 |
| Creators | Chiang, Chen-jung |
| Contributors | none, none, none, none |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0804104-101527 |
| Rights | off_campus_withheld, Copyright information available at source archive |
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