冬季吕宋岛西北海域频繁出现藻华现象,本文使用吕宋岛西北部海域1999年11月至2015年2月共16 a冬季多卫星融合水色遥感资料,利用经验正交函数(EOF)分解方法对长时间序列的Chl-a质量浓度的时空变化进行分析讨论,并结合海表温度(SST)、风速(WS)、海面高度异常(SLA)等数据以及上述数据计算获得的相关物理环境参数,分析其与海表Chl-a质量浓度之间的关系,探讨吕宋岛西北海域海表Chl-a质量浓度的时空分布规律以及Chl-a质量浓度与周边环境的响应关系.研究结果表明通常冬季吕宋岛西北海域海表均会出现大约以(19°N,119°E)为中心的高Chl-a质量浓度现象,平行海岸的风应力以及风应力涡旋引起冬季上升流,增加了营养盐的输入,很可能是该区域藻华形成的主要机制.同时背景流场的平流效应很可能诱发上升流区域与叶绿素藻华区中心不一致,可能引起了藻华中心的北移.%The phenomenon of phytoplankton blooms in the northwest of Luzon Island is frequently observed in winter.In our study,using the multi-satellite merged ocean color remote sensing data from November 1999 to February 2015 in the northwestern region of Luzon Island,the spatial and temporal changes of Chl-a concentration in long time series were investigated by means of the empirical orthogonal function(EOF) decomposition method and multiple correlation analysis(MCA).Combined with physical environmental parameters such as wind speed(WS),sea surface temperature(SST)and sea level anomalies(SLA),the relationship betw een Chl-a and surrounding sea environments w as then investigated in the study.T he results show that centers of winter Chl-a blooms in northwest of Luzon Island appear often at the location of about (19°N,119°E).Significant multiple correlation coefficient(R= 0.782 6,P< 0.05)from the multiple correlation analysis between Chl-a and oceanic conditions indicates that the wind parallel to the coastline and the wind stress curls enhance winter upwelling in the study area,increasing the input of the nutrients into the upper layer,which is probably the main mechanism of the formation of phytoplankton blooms in the area.At the same time,the advection effect of the background flow field is likely to induce the upwelling area to be inconsistent with the center of phytoplankton blooms,triggering the phenomenon that the centers of phytoplankton blooms shifted northward along with the water body in the area.
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