Application Of Fuzzy Clustering To Water Masses Analysis Of The South China Sea

The following issues are examined using the in situ observation data, collected by Nansha Comprehensive Scientific Investigation program, South China Sea Monsoon Experiment and "973Intensive Observasion Program of the SCS circulation" in the recent10years, Combined with the historical Temperature and Salinity data derived from WOD94and remote sensing/merged reanalysis air-sea interface factor data in the Northern South China Sea:Seasonal shift of spring to summer2004～2011. Both in2004-2011, the seasonal shift of the thermohalin structure and circulation patterns undergo similar processing:comparing with the situation before the monsoon onset, the majority of the anticyclonic eddy of the southeastern Vienam coast migrate towards Northeastern, and their strength and area increased simultane-ously, and it make up the core structure of the typical structure of summer mode. On the other hand, their are many difference on the seasonal shift between these two year, which suggest that the seasonal evolution of hydrology character in the S SCS is prominent di(?)er from year to year.Interannual difference of the Spring/summer Hydrology character. The in situ observation result indicate that the upperlayers’thermohaline and geostrophic current character in Spring and summer has prominent interannual variability. The interannual variability of the wind-elds and corresponding wind curl is the most dominant forcing factors of marine variability, at the same time, the E-P, Qnet and the exchange of the N SCS and adjacent regions also play important roles.