2006年夏季粤东至闽南近岸海域上升流的特征  

Characteristics of upwelling in eastern Guangdong and southern Fujian coastal waters during 2006 summer

作　　者：蔡尚湛[1] 吴日升[1] 许金电[1] 

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《台湾海峡》2011年第4期489-497,共9页Journal of Oceanography In Taiwan Strait

基　　金：国家908专项资助项目(908-ZC-I-01)

摘　　要：利用2006年夏季粤东至闽南近岸海域海水的实测温度、盐度资料和海表温度、叶绿素a含量的卫星遥感资料,分析了该海域的上升流现象.结果表明:上升流区水体具有低温、高盐特征,其中心区域位于汕头至东山一带近岸海域.在汕头以西海域,外海深层低温高盐水沿海底地形向岸爬升形成上升流.汕头以东近岸海域的上升流为爬升至惠来近岸的外海水随沿岸流向东北方向运动,并在各地沿海底地形爬升所致.研究海域上升流区的水体属同一来源,均来自汕头西南外海.汕头以东近岸海域的上升流强度大于汕头以西,水温低于23.0℃、盐度高于34.00的外海水仅爬升至汕头以西近岸海表以下25 m左右,但可出现在汕头以东近岸10 m以浅海域.以研究海域海表温度低于27.5℃的沿岸低温区的面积来反映上升流的强度,通过对海表温度遥感数据的分析可知:7月初至7月中旬和7月28日至8月上旬,低温区域面积较大且较为稳定,上升流强度较大;7月19～27日期间和8月中旬以后,低温区域面积较小或短暂消失,上升流强度较弱.该上升流在2006年7～8月期间经历了强-弱-强-弱的短期变化过程.This study analyzed the characteristics and spatial structure of the upwelling in eastern Guangdong and southern Fujian coastal waters with reference to the temperature, salinity and satellite remote sensing data of sea surface temperature（SST） and chlorophyll-a （chl-a） concentration during 2006 summer. Results showed that the upwelling water area was cllaracterized by low temperature and high salinity, and its center was located at the coast- al area between Shantou and Dongshan. [n the waters west of Shantou, the deep sea water with low temperature and high salinity rised to the upper layers in coastal areas following the topographic changes and consequently induced upwelling. Because of the interference of the Taiwan Bank, the water in coastal upwelling area east of Shantou did not come from the deep sea southeast of the bank, instead, it was the northeast movement of the deep sea water which reached the Huilai coast, along with the alongshore current, that drove the upwelling. Water in the two up- welling areas were of the same origin deep sea southwest of Shantou. Analytical results also revealed that up- welling was stronger in coastal waters east of Shantou than that in west of Shantou, for the deep sea water with tem- perature below 23.0~ and salinity above 34.00 can only rise to about 25m below the sea surface in coastal waterswest of Shantou, but was able to rise to coastal area 10m below sea surface east of Shantou. Coastal area with SST below 27.5~C within the studied area was taken into account to reflect the upwelling intensity. Based on the remote sensing data of SST, the study found that the upwelling was stronger from early July to Mid-July and from 28^th July to early August for the low-temperature area was larger and more stable, while it was weaker from 19^th July to 27^th July and after Mid-August for the low-temperature area was smaller or disappeared temporarily. The upwelling expe- rienced a strong-weak-strong-weak short-term variation durinz Julv and August in 2006.

关 键 词：物理海洋学 上升流 海表温度 叶绿素A 地形 夏季 广东海域 福建海域 

分 类 号：P731[天文地球—海洋科学]