Spatial correlations in time and frequency domains between chlorophyll-a concentration and environmental factors in the Bohai Sea  

作　　者：Wan XU Di MU Zhenteng YANG Dekui YUAN 

机构地区：[1]Department of Mechanics,Tianjin University,Tianjin 300350,China [2]Engineering Research Center of Seawater Utilization of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300130,China [3]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China

出　　处：《Journal of Oceanology and Limnology》2024年第4期1143-1156,共14页海洋湖沼学报（英文）

基　　金：Supported by the Key Research and Development Program of 14 th Five year Plan of China(No.2021YFC3200401-04);the Major Scientific and Technological Projects of Tianjin(No.18 ZXRHSF00270)。

摘　　要：Based on the reconstructed MODIS data and ECMWF reanalysis data from 2003 to 2021,spatial correlations between chlorophyll a(Chl a)and sea surface temperature(SST),photosynthetically available radiation(PAR),aerosol optical thickness(AOT),and wind speed(WS)in the Bohai Sea were analyzed from the perspective of time domain and frequency domain.Results indicate that the frequency domain analysis was more conducive to revealing the correlations between Chl a and environmental factors.The spatial pattern of time-domain correlations was similar to the isobaths of the Bohai Sea,which was positive in shallow waters and negative in deep waters for SST,PAR,and AOT,and was reversed for WS.Frequency-domain correlations were obtained by performing Fourier Transform and were higher than correlations in time domain.The spatial distributions indicated that the effects of SST and PAR on Chl a were greater than AOT and WS in the Bohai Sea.Additionally,cross-spectrum analysis was applied to explore the response relationships.A depth-dependent pattern was shown in correlations and time lags,indicating that the influential mechanism of environmental factors on Chl-a concentration is related to seawater depth.

关 键 词：chlorophyll a(Chl a) frequency domain spatial correlation Bohai Sea 

分 类 号：X55[环境科学与工程—环境工程]