渤海叶绿素 a 浓度与环境因素的响应关系研究

study on the response relationship between chlorophyll-a concentration and environmental factors in the Bohai sea

中文关键词:  叶绿素 a 浓度  环境因子  相关性  渤海

英文关键词:chlorophyll-a concentration: environmental factors: correlation: Bohai sea

中文摘要:

      基于 2003－2018 年的遥感反演和再分析数据， 分别在时域和频域上分析了渤海海表面温度、光合有效辐射、气溶 胶厚度、风速与叶绿素 a 浓度之间的响应关系。通过傅里叶变换在频域上得到各因素之间的相关性系数， 其显著高于直接在 时域上计算得到的相关性系数， 表明由于相位差的影响， 直接在时域进行相关性分析很可能会低估各因素之间的相关性。傅 里叶变换后的频谱图显示， 叶绿素 a 浓度存在一年、半年、4 个月与季节周期； 风速与气溶胶厚度存在明显的一年和半年周 期； 海表面温度和光合有效辐射具有明显的一年周期， 半年周期较其他几个因素不明显。交叉谱分析的结果表明： 叶绿素 a 浓度和所选的环境因子都在一年周期下具有最大的交叉振幅， 表明在此频率下响应最大； 风速、气溶胶厚度、光合有效辐射 分别超前于叶绿素 a 浓度约 5.0 个月、0.2 个月、0.2 个月， 海表面温度则滞后 1.9 个月。各环境因子之间相互关联， 共同影 响叶绿素 a 浓度的时间分布。

英文摘要:

      Based on the remote sensing inversion and reanalysis data from 2003 to 2018 , the response relationships between sea surface temperature. photosynthetically active radiation. aerosol optical thickness. wind speed and chlorophyll-a concentration in the Bohai sea were analyzed in time and frequency domain respectively. The correlation coefficients between the factors obtained by Fourier transform in the frequency domain were significantly higher than that calculated directly in the time domain. which showed that the correlation analysis performed directly in the time domain possibly underestimated the correlation between the factors due to the influence of phase difference. The amplitude-spectrum showed that chlorophyll-a concentration had one-year. half-year. four months and seasonal cycles. There were obvious one-year and half-year cycles in wind speed and aerosol optical thickness. The sea surface temperature and photosynthetically active radiation had an obvious one -year cycle. and their half-year cycle was less obvious than the other factors. The results of cross spectrum analysis showed that both chlorophyll-a concentration and selected environmental factors had the largest cross amplitude in one-year cycle. indicating that the response was the largest at this frequency: Wind speed. aerosol optical thickness and photosynthetically active radiation were about 5.0 months. 0.2 months and 0.2 months ahead of chlorophyll-a concentration respectively. and the sea surface temperature lagged by 1.9 months. The environmental factors were interrelated and jointly affected the temporal distribution of chlorophyll-a concentration.