As one of the most important physical oceanography topics, the characteristics and variabilities of circulations in the ESE areas are extensively and respectively investigated. There are few demonstrated thorough investigations and studies by integrating the ESE area as one system, especially for areas neighboring large buoyancy, sediment and biogeochemical sustains discharges, for example, shelves around PRE.
The aforementioned numerical simulation system for HKW well resolved the processes in this ESE system, and demonstrated interactions already. For example, over the shelf off Guangdong, when southwesterly monsoon prevails in June and July, the upwelling circulation is remarkably intensified eastward, and the shelf waters rich in phosphate, is stored in the lower layers of Mirs Bay and stimulated the biological productivity there. When the monsoonal system is getting unstable in late summer, these stored shelf waters, with high density, will retreat towards the Dan-gan channel and approach the entrance of PRE to further intensify the exchanging flow, as well as the biological productivity. This process determines the regime-shift of the shelf circulations from a summer to a winter condition in the northern SCS.
The basin-slope-shelf exchanges of waters in the SCS are attracting an increasing attention of the community recently, and one of the most important aspects of this topic is the hotspot/passages, where cross-slope exchanges, especially the basin-ward direction, occur. The intensity and mechanism of these exchanges will greatly impact the ability of SCS in coupling with the global carbonate system in a climate scale. The CMOMS system, I’m working on, demonstrates several passages in the deep ocean to the southwest of Xisha Islands, and neighboring the Nansha Islands. With respect to the difficulty of numerical simulation in revealing the deep circulations, it is important to combine both field observations, including satellite remote sensing, argo and R/V based profiling in the proposed passages to understand the dynamics. It is also naturally important to closely cooperate with scientists in subject of the geological and biogeochemical oceanography.
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