Spatiotemporal features and vertical structures of four types of mesoscale eddies in the Kuroshio Extension region

Bowen Sun Shuchang Xu Zhankun Wang Yujie Feng Baofu Li

Bowen Sun, Shuchang Xu, Zhankun Wang, Yujie Feng, Baofu Li. Spatiotemporal features and vertical structures of four types of mesoscale eddies in the Kuroshio Extension region[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2323-x
Citation: Bowen Sun, Shuchang Xu, Zhankun Wang, Yujie Feng, Baofu Li. Spatiotemporal features and vertical structures of four types of mesoscale eddies in the Kuroshio Extension region[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-024-2323-x

doi: 10.1007/s13131-024-2323-x

Spatiotemporal features and vertical structures of four types of mesoscale eddies in the Kuroshio Extension region

Funds: The Natural Science Foundation of Shandong Province under contract No. ZR2021YQ28; the Taishan Scholars Project of Shandong Province under contract No. tsqn202306182.
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  • Figure  1.  Distribution of average eddy kinetic energy (EKE, shading) and absolute dynamic topography (ADT, contours) in the Kuroshio Extension jet and its vicinity (a), correlation coefficient of mesoscale sea surface height anomaly (SSHA) and sea surface temperature anomaly (SSTA) (the dotted region means passing the significance test of 0.01) (b), climatological monthly regional-average EKE (c), and annual cycle of spatial correlation coefficient of mesoscale SSHA and SSTA (d). The shadings in c and d indicate the standard error.

    Figure  2.  Scatter plots of sea surface height (SSH) anomaly and sea surface temperature (SST) anomaly averaged inside the eddy core corresponding to CE (a) and AE (b). The color of scatter plots denotes the proportion $ {\text{γ}} $b of abnormal points within one radius from the eddy center.

    Figure  3.  The evolution process of the average T'in (blue curves) and proportion $ {\text{γ}}$b (red curves) inside the eddy core during the lifetime of a CE (a) and an AE (b). The orange shadings mark the abnormal eddy duration periods according to the definition conditions in this study.

    Figure  4.  The distribution of zonal average radius (a), amplitude (b), eddy kinetic energy (EKE, c) and EKE intensity (EI, d) for each type of eddies in 0.5°-width latitudinal bands. WCE, warm cyclonic eddy; CAE, cold anticyclonic eddy; CCE, cold cyclonic eddy; WAE, warm anticyclonic eddy.

    Figure  5.  Seasonal variation of the occurrence frequency of four types of eddies. a. Proportion of WCEs in all CEs in each 0.5° latitudinal bands in four seasons; b. the same with a, but for CAEs in all AEs; c. average occurrence numbers for four types of eddies in each month; d. average proportion of abnormal eddies in all eddies in each month. CE, cyclonic eddy; AE, anticyclonic eddy; WCE, warm cyclonic eddy; CAE, cold anticyclonic eddy; CCE, cold cyclonic eddy; WAE, warm anticyclonic eddy.

    Figure  6.  The proportion of abnormal eddies (a) and normal eddies (b) in total eddies with corresponding polarity. WCE, warm cyclonic eddy; CAE, cold anticyclonic eddy; CCE, cold cyclonic eddy; WAE, warm anticyclonic eddy.

    Figure  7.  Average potential temperature and salinity characteristics in study area for four seasons. The black contour lines represent potential density (kg/m3), the thin colored lines represent the region north of 35°N, while the thick ones represent the region south of it.

    Figure  8.  Composite sea surface temperature (SST) anomaly (color shading) and sea surface height (SSH) anomaly (contours, units: cm) of WCEs (a), CCEs (b), CAEs (c) and WAEs (d). IAE, index of abnormal eddy.

    Figure  9.  Vertical profiles of the temperature anomaly averaged within the radius (a) and maximum Vg anomaly on each level of the composite eddy structures (b). WCE, warm cyclonic eddy; CAE, cold anticyclonic eddy; CCE, cold cyclonic eddy; WAE, warm anticyclonic eddy.

    Figure  10.  West-east sections of temperature anomaly (color shading) and geostrophic velocity anomaly (contours, units: cm/s) across the center of composite WCEs (a), CCEs (b), CAEs (c) and WAEs (d).

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  • 收稿日期:  2023-12-01
  • 录用日期:  2024-02-29
  • 网络出版日期:  2024-05-13

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