Fronts in coastal oceans are important mesoscale processes that relate to regional dynamics and can impact ecosystems. The daily distribution of a sea surface temperature (SST) front is obtained in the East China Sea (ECS) using 15 years of satellite observations. High frontal activities are mainly found near the coast. The spatial and temporal variability of the monthly frontal probability is subsequently investigated using an empirical orthogonal function (EOF). Seasonal variability in frontal activities is predominant for the majority of the ECS, with the highest and lowest values occurring during winter and summer, respectively. Some major fronts have been identified, such as coastal and shelf fronts. The coastal fronts can be further divided into three separate sections: near Hangzhou Bay and along the Jiangsu and Zhejiang coasts, respectively. The shelf fronts have two sections: north and south of the Changjiang River. All fronts are characterized by a prominent seasonal cycle, though their seasonalities differ. The underlying driving forces, e.g., alongshore wind, SST, and river discharge, are further analyzed for the individual fronts. River discharge is the driving factor of fronts to the south of the Hangzhou Bay along the Zhejiang coasts while wind is the main reason for the frontogenesis near and north of Hangzhou Bay. The SST largely influences the frontal dynamics for the shelf and coastal fronts to the north. This study comprehensively describes the frontal activities in the ECS and leads to a better understanding of frontogenesis in the coastal region. It is fundamentally helpful for fisheries management and has great potential for oceanic pollution control.

沿海海洋的前沿是重要的中尺度过程，与区域动态有关并可能影响生态系统。使用15年的卫星观测数据，可以在东海（ECS）中获得海面温度（SST）前沿的每日分布。高额锋活动主要发生在海岸附近。随后使用经验正交函数（EOF）研究每月额叶概率的时空变化。在大多数ECS中，额叶活动的季节性变化最为明显，最高值和最低值分别发生在冬季和夏季。已经确定了一些主要战线，例如沿海战线和架子战线。沿海地区可进一步分为三个部分：杭州湾附近以及江苏和浙江沿海地区，分别。架子的前部有两个部分：长江的北部和南部。所有战线都有明显的季节性周期，尽管它们的季节性不同。针对各个前沿进一步分析了潜在的驱动力，例如，沿海风，海温和河流流量。河流流量是沿浙江沿海向杭州湾以南的锋面的驱动因素，而风是杭州湾以北和北部的前生的主要原因。SST在很大程度上影响着北部的陆架和海岸带的锋面动力。这项研究全面描述了ECS中的额叶活动，并导致对沿海地区的额叶发生有了更好的了解。它从根本上对渔业管理有帮助，在控制海洋污染方面具有巨大潜力。架子的前部有两个部分：长江的北部和南部。所有战线都有明显的季节性周期，尽管它们的季节性不同。针对各个前沿进一步分析了潜在的驱动力，例如，沿海风，海温和河流流量。河流流量是沿浙江沿海向杭州湾以南的锋面的驱动因素，而风是杭州湾以北和北部的前生的主要原因。SST在很大程度上影响着北部的陆架和海岸带的锋面动力。这项研究全面描述了ECS中的额叶活动，并导致对沿海地区的额叶发生有了更好的了解。它从根本上对渔业管理有帮助，在控制海洋污染方面具有巨大潜力。架子的前部有两个部分：长江的北部和南部。所有战线都有明显的季节性周期，尽管它们的季节性不同。针对各个前沿进一步分析了潜在的驱动力，例如，沿海风，海温和河流流量。河流流量是沿浙江沿海向杭州湾以南的锋面的驱动因素，而风是杭州湾以北和北部的前生的主要原因。SST在很大程度上影响着北部的陆架和海岸带的锋面动力。这项研究全面描述了ECS中的额叶活动，并导致对沿海地区的额叶发生有了更好的了解。它从根本上对渔业管理有帮助，在控制海洋污染方面具有巨大潜力。