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根据2011年5月~2012年2月春、夏、秋、冬4个航次东海海域的调查资料,分析了东海典型断面Chl a的分布特征、季节变化及其影响因素。结果表明:(1)东海海域Chl a的平面分布呈现出由近岸向远海递减的趋势,高值区相对集中在西部近岸海域,低浓度区域分布在东部较为开阔的远海海域。水动力条件、陆源径流的输入以及气候变化等因素是形成这种分布格局的主要原因。(2)Chl a的垂直分布受季节影响较大,春、夏两季变化幅度较秋、冬季大。(3)在季节变化上呈春季>夏季>秋季>冬季的规律。(4)相关性分析表明,调查海域Chl a与水温的关系在夏季较为显著;与盐度的相关性趋势并不明显,与DO则在春季有着良好的相关性;与营养盐在春季呈显著正相关,说明营养盐是影响Chl a分布的主导因子。
According to the survey data of 4 sea voyages in spring, summer, autumn and winter from May 2011 to February 2012, the distribution characteristics, seasonal variations and influential factors of Chl a in the typical section of the East China Sea are analyzed. The results show that: (1) The distribution of Chl a in the East China Sea has a decreasing trend from near shore to distant sea. The high value areas are relatively concentrated in the western coastal areas and the low density areas are distributed in the open sea areas in the east. Hydrodynamic conditions, input of terrestrial runoff and climate change are the main reasons for the formation of this distribution pattern. (2) The vertical distribution of Chl a is greatly affected by the seasons, and the change range of Chl a in autumn and autumn is bigger than that in autumn and winter. (3) The seasonal changes in spring> summer> autumn> winter. (4) The correlation analysis showed that the relationship between Chl a and water temperature in the survey area was significant in summer, the correlation between salinity and salinity was not obvious, and the correlation between DO and Chl a had a good correlation in spring; Positive correlation, indicating that nutrient salt is the dominant factor affecting Chl a distribution.