Correlation analysis of the sea surface features under eddy modulation in the global ocean using remote sensing data
Mesoscale eddies are broadly distributed in the global ocean and have significant effects on the Sea Surface Temperature(SST),Sea Surface Height(SSH),Chlorophyll(Ch1),Wind Speed(WS),and other ocean parameters.Accordingly,the coupling analysis of mesoscale eddies and ocean key parameters is an important aspect of ocean research.The Anti-cyclonic Eddy(AE),Cyclonic Eddy(CE),and Outside Eddy(OE)can be better distinguished with the realization of the individual eddy identification technology.Accordingly,we can comprehensively study the distribution and difference of correlation of sea surface features by comparing OE with AE and CE,providing a theoretical basis for further clarifying the modulation mechanism of the mesoscale eddy on the air-sea interface and improving ocean numerical simulation.This study calculated the Pearson correlation coefficient using Sea Surface Temperature Anomaly(SSTA),Sea Level Anomaly(SLA),Chlorophyll Anomaly(CHLA),and Wind Speed Abnormal(WSA)data from 2010 to 2019 through distinguishing AE,CE,and OE and compared the smoothness of the correlation coefficient.Results show that the correlation distribution among the parameters has significant regional characteristics.In CE and AE,the correlation is±0.5 in most areas of the ocean and±0.7 in the Northern Indian Ocean and the Equatorial Pacific.In OE,the correlation is±0.2 in most regions and±0.4 in the Northern Indian Ocean and the Equatorial Pacific.In addition,when a positive(negative)correlation occurs in OE,it generally shows a large range of positive(negative)correlation,and a noticeable transition region exists between the two.However,the extreme correlation regions are smaller and mainly present as scattered points under the influence of eddy,and the transition regions between the positive and the negative regions are narrow.The smoothness coefficient of the correlation coefficient of each parameter in OE is about 15,while those of AE and CE is about 450,which is much lower than that in the OE area.We conclude that the influence of eddy on the correlation of each parameter is mainly reflected in the value,distribution,and smoothness of the correlation coefficient.The correlation coefficient of each parameter in OE is about 0.2 lower than that in CE and AE,and the smoothness of the correlation coefficient in OE is about 30 times that in AE and CE.The correlation distribution also has a strong point feature in the original distribution mode due to the modulation of the eddy.
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