英文摘要：The offshore China (OC) region is a significant sea area in the Western Pacific and many researchers have been interested in the distribution of sea surface temperature (SST) fronts in this area. In this study, the Cayula and Cornillon single image edge detection algorithm was used to detect SST fronts using the Daily Optimum Interpolation Sea Surface Temperature data from 1982 to 2021. The results revealed that there are eighteen SST fronts in OC— three in the Bohai Sea, seven in the Yellow Sea, two in the East China Sea, five in the South China Sea, one in the Pacific Ocean east of Taiwan province, China—and among them a new front was detected in the Yellow Sea and named the Yellow Sea Ring Front. The frequency of most fronts showed a tendency of initially increasing and then decreasing from January to September, followed by a trend of growing steadily from October to December. The frequency of a few fronts showed a decreasing tendency from January to September and an increasing tendency from October to December. The frequency of most fronts is highest in winter and lowest in summer. In spring and autumn, the frequency of most fronts is lower than that in winter and higher than that in summer. The annual average frontal probability of five-ninths of the fronts showed an upward trend, and the annual average frontal probability value of one-third of the fronts showed a downward trend. The rest of the fronts showed a stable trend. The results of this paper also showed that the Liaodong Bay Front and the Bohai-Laizhou Bay Front did not form a complete front, as previously reported. In addition, the frontal probability of the Bohai Front to the north of 39° N was in the tendency of decreasing.

1982-2021年中国近海海表温度锋的年际、季节和月变化

中文摘要：中国近海（OC）区域使西太平洋的重要海域，海表温度锋的分布也受到许多研究人员关注。本文采用Cayula和Cornillon图像边缘检测算法，利用1982-2021年最佳插值的日平均海表面温度（SST）对温度锋进行识别。结果表明，中国近海共有18个锋面：渤海3个，黄海7个，东海2个，南海5个，台湾以东太平洋1个，其中在黄海观测到一个新的锋面，命名为黄海环状锋。1-9月大部分锋面的频率呈先增加后减小，10-12月为稳定增长。少数锋面频率在1-9月下降，而10-12月上升。大多数锋面频率在冬季最强，夏季最弱，大多数锋面在春秋的频率小于冬季而大于夏季。年际变化上，5/9锋面出现概率呈上升趋势，1/3呈下降趋势，其余为持平。结果还表明，辽东湾锋和渤海-莱州湾锋并未如前人研究所说般连成一个完整的锋面，此外，渤海锋的出现概率在39°N以北成减小趋势。