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。
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.
作者
王晴
袁德奎
李旭
毛倚天
王雪
WANG Qing;YUAN Dekui;LI Xu;MAO Yitian;WANG Xue(School of Mechanical Engineering,Tianjin University,Tianjin 300350,China)
出处
《海洋通报》
CAS
CSCD
北大核心
2022年第5期601-609,共9页
Marine Science Bulletin
基金
天津市科技重大专项与工程项目(18ZXRHSF00270)
国家自然科学基金(11872271)。
关键词
叶绿素A浓度
环境因子
相关性
渤海
chlorophyll-a concentration
environmental factors
correlation
Bohai Sea
