An eddy evolution based on the three-dimensional structure of chlorophyll A in the Kuroshio-Oyashio Confluence Region
The widespread mesoscale eddies in the Kuroshio-Oyashio Confluence Region can regulate the temporal and spatial evolution of chlorophyllathrough material transport and redistribution.That will further affect the ocean ecological environment.Based on satellite altimeter observation and chlorophyll areanalysis data,velocity vector and normalized composite analysis methods were used to detect eddies and construct the three-dimensional structure of chlorophyll awithin eddy spatial scales.The temporal and spatial evolution of chlorophyll acorresponding to different horizontal scales were analyzed during different periods of cyclonic and anticyclonic eddy.The eddy movement influences on the chlorophyllawere discussed in the Kuroshio-Oyashio Confluence Region.The results showed that the higher chlorophyll agradually expanded to the northwest of the eddy center upward within the cold eddies(300 m shallow,3 times radius range).The chlorophyll a increased firstly,and then decreased with the increase of depth.With the cyclonic eddy evolution,the high chlorophyllagradually expanded to the eddy center at each depth.The total chlorophyllatransport within the mean radius had a highest value at the stable period.Within the anticyclonic eddy,the chlorophyll a was higher than that of the cyclonic eddy.The chlorophyll a decreased with depth downward.the lower chlorophyll aexpanded from southeast to northwest of the eddy center.During the evolution process of the anticyclonic eddy,the higher chlorophyllagradually converged towards the eddy boundary.
eddychlorophyll athree-dimensional structureevolution charactersKuroshio-Oyashio confluence region
NETL
NSTL
万方数据
