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Using Front as Interfaces among Atmosphere, Ocean and Ecosystem
王云涛
自然资源部第二海洋研究所
Front can be used an important interface among different system, such ocean-atmosphere, and among different water masses. The South China Sea (SCS) is a perfect basin for investigating the frontogenesis because of enrich dynamic processes. High-resolution satellite observations of sea surface temperature (SST) were used to derive the daily SST fronts and monthly frontal probability (FP) in the SCS. An improved frontal detection method was applied to improve the accuracy for frontal identification. The current study offered a comprehensive description for the variability of SST front and the associated dynamics in the SCS. Large variability was found along the coast of China and Vietnam, northwest of Luzon Island, and the corresponding seasonal cycle captured highest (lowest) values in winter (fall). The wind pattern was found highly influential for frontogenesis. The northeast monsoon in winter drove onshore Ekman transport near the coast of China, which induced convergence between coastal cold water and onshore warm water. The corresponding front is highly consistent with other global regions where ocean current drives front. The southwest monsoon during summer induced offshore transport, which brought upwelling near the coast of southeast Vietnam and east of Hainan Island. There were fronts generated between cold coastal water and offshore warm water during both monsoon patterns for impacted regions. Front can modify the stability of atmospheric boundary layer above and subsequently influence the wind field. A positive air-sea coupling relation is identified near front, e.g., in upwelling system off Vietnam. The frontal activities can also impact the development of ecosystem, which is prominently shown by the chlorophyll. Thus, a comprehensive understanding of front can be very useful to quantify the interaction among different system.