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[ACG36-12] Interannual variations in sea surface temperature and height of the Yellow and East China Seas correlated between winter and spring
Keywords:Circulation of the Yellow and East China Seas, Winter monsoon, Absolute dynamic topography, SST, Winter-spring correlation, Interannual variation
This study shows the interannual variations of sea surface temperature (SST) and absolute dynamic topography (ADT) in the Yellow and East China Seas. Especially we focus on the inter-related variability in SST and ADT from winter to spring. Geostrophic ocean current can be estimated from ADT.
Merged satellite and in-situ data global daily sea surface temperature (MGDSST: Kurihara et al., 2006) and ADT of Global Ocean Gridded L4 Sea Surface Heights provided by Japan Meteorological Agency (JMA) and National Centre for Space Studies (CNES, https://doi.org/10.48670/moi-00148), respectively, were used. The empirical orthogonal function (EOF) analysis was performed both on the winter (January–March) and spring (April–June) average SST (or ADT) from 1982 (or 1993) to 2021 in the Yellow and East China Seas. The first five EOF modes were decomposed from the spatiotemporal data.
The first mode of winter SST showed that the water temperature in shallow waters effectively decreased by cold northerly wind. The interannual variation in spring SST was similar to that in winter although their spatial structures were different. These SST variations were linked to the ADT third mode, which corresponds to the spring ADT anomaly in the central Yellow Sea. This change in ADT determines the strength of the counterclockwise circulation in the Yellow Sea.
Merged satellite and in-situ data global daily sea surface temperature (MGDSST: Kurihara et al., 2006) and ADT of Global Ocean Gridded L4 Sea Surface Heights provided by Japan Meteorological Agency (JMA) and National Centre for Space Studies (CNES, https://doi.org/10.48670/moi-00148), respectively, were used. The empirical orthogonal function (EOF) analysis was performed both on the winter (January–March) and spring (April–June) average SST (or ADT) from 1982 (or 1993) to 2021 in the Yellow and East China Seas. The first five EOF modes were decomposed from the spatiotemporal data.
The first mode of winter SST showed that the water temperature in shallow waters effectively decreased by cold northerly wind. The interannual variation in spring SST was similar to that in winter although their spatial structures were different. These SST variations were linked to the ADT third mode, which corresponds to the spring ADT anomaly in the central Yellow Sea. This change in ADT determines the strength of the counterclockwise circulation in the Yellow Sea.