资源环境科技发展态势分析平台

Recent satellite sea surface height (SSH) and sea surface temperature (SST) observations have shown that abnormal eddies, i.e., warm cyclonic eddies and cold anticyclonic eddies occur sporadically in some regions, which triggers an essential question on the spatiotemporal distribution of abnormal eddies in the global ocean. In this paper, a deep learning framework was developed to systematically mine information from the synergy of satellite-sensed global SSH and SST data over the 1996–2015, 20-year period. Abnormal eddies account for a surprising one-third of total eddies and are active along the Equatorial Current and high unstable currents. Normal (abnormal) eddies are stronger in winter (summer) in the North Hemisphere and vice versa in the Southern Hemisphere. The annual mean amplitudes of normal eddies are larger than that of abnormal eddies. Crucially, the daily number of normal (abnormal) eddies increased (decreased) 9.68 (11.80) every year.