Program
 
General Session 2: Marine & estuarine biogeochemistry
 
 
 
Poster
Intrusion pattern of Kuroshio subsurface water onto the East China Sea continental shelf by dissolved inorganic iodine species and other tracers in spring and autumn
GS2-65-S
Peng Zhou* , Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology University of Chinese Academy of Sciences
Yongquan Yuan, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology
Zhiming Yu, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology
Xiuxian Song, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences Laboratory of Marine Ecology and Environmental Science, Qingdao National laboratory for Marine Science and Technology
Presenter Email: 413349075@qq.com
The Kuroshio has an important influence on the circulation systems and ecological environment of the East China Sea Continental Shelf (ECSCS), but the intrusion pattern of Kuroshio in the ECSCS are still debated. Here combined evidences from both hydrographic data and dissolved inorganic iodine species totally suggest that there was a cold (<19 °C), saline (>34.4), high density (>24.5 Kg/m3), R-iodate-rich (>0.35 μM) and R-iodide-poor (<0.10 μM) water at the bottom of ECSCS (depth<100m). The characteristics of this water were close to the Kuroshio subsurface water (KSSW), which was upwelled from the northeast of Taiwan (25.5 °N) mainly. Additionally, indicated by dissolved inorganic iodine species, there was another intrusion from KSSW at ~ 27.5 °N along the -100m isobath, which was not obvious observed by using the hydrographic data. Therefore, it suggested that iodine species might be a much effective tracer for upwelling water. In spring, the major water upwelled from the KSSW, which derived from the northeast of Taiwan, flowed northwestward, and then bifurcated into nearshore branch and offshore branch at ~ 27 °N. The nearshore branch flowed northwestward, and could reach the -50m isobath off the Zhejiang coast finally (29.5 °N). Meanwhile, the offshore branch flowed along the -100m isobath, and could reach 29 °N. In autumn, the intrusion of KSSW northeast of Taiwan was obviously weaker than that of spring. In this season the nearshore branch has not been observed, and the offshore branch could only reach ~28 °N. Moreover, there was seasonal fluctuation for another intrusion from KSSW at ~ 27.5 °N, either. In spring, it flowed northwestward, and could reach 29.5 °N finally; while it just stayed along the -100m isobath in autumn. As a whole, the intrusion from the KSSW, being meaningful in both hydrodynamics and biogeochemistry of the ECSCS, deserves further research attentions.