Abstract
Combination of the hydrographic and satellite-derived Sea Surface Temperature (SST) data provides Dew evidence for the existence of four Upwelling-related Low Temperature Zones (LTZs) in the Taiwan Strait in summer. These LTZs are located along the southwestern coast of the Taiwan Strait (SW-LTZ), along the northwestern coast of the Taiwan Strait (NW-LTZ), near the Taiwan Bank (TB-LTZ) and around the Penghu Islands (PH-LTZ), respectively. The hydrographic data from three August cruises during 1997-1999 show that these LTZs also possess relatively higher salinity (greater than 34) at the surface layer. Four years of higher resolution AVHRR satellite-derived SST data clearly indicate the summertime pattern of these upwelling-related LTZs and demonstrate their inter-annual and inter-monthly variability.
Highlights
The Taiwan Strait plays a very important role on the water exchange between the East China Sea and the South China Sea
The SW-Low Temperature Zones (LTZs) usually has two centers located in the east of Dongshan and in the southwest of Nan-ao, respectively
The TB-LTZ generally appears over the shal lower Taiwan Bank, and it sometimes connects with the SW-LTZ at its western edge while most other time connects with the PH-LTZ at its northeastern edge
Summary
Wu (1983) demonstrated a climatological picture of the summertime (June-August) tem perature and salinity distributions (Fig. 2) and concluded that: the Sea Surface Temperature (SST) ranges from 25°C to 30°C with lower SST in the northwestern and southwestern parts and higher SST in the southern and eastern parts of the Taiwan Strait (Fig. 2a), and the Sea. Surface Salinity (SSS) is higher in the eastern part but lower in the western part of the Taiwan Strait while a low SSS tongue extends to the Taiwan Bank from the eastern Guangdong (Kuang tung) (see Fig. 2b). As reviewed by Hu et al (2000), there exist four main upwelling regions (see Fig.l for schematic locations) in the Taiwan Strait.
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