《Table 1.Separation of seasons according to month》

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《Exploring thermocline and water masses variability in southern South China Sea from the World Ocean Database(WOD)》

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World Ocean Database（WOD）is one of the ocean climatology program under National Oceanic and Atmospheric Administration（NOAA）.It was compiled at NOAA’s National Oceanographic Data Center（NODC）in Silver Spring，Maryland，USA This database consist of physical oceanographic datasets which include over 12 million water temperature datasets and 5.6 million water salinity datasets.Data from WOD is beneficial because it is suitable for wide range of spatial and temporal studies.Availability of data is started from the year 1900 until 2014.The data in WOD is updated for every 4 years.The validity of data is nondeniable because this data is required with full set of quality control.At global distribution，started from 1974，the number of data provided increased until 2013.Data from WOD are very reliable for multi-decadal study（Seidov et al.，2015；Yashayaev and Seidov，2015）.Referring to physical oceanography purpose，the most important parameter is temperature and salinity.Datasets in WOD is sorted according to geographical or yearly.The extraction of data can be downloaded for free with this link:https://www nodc.noaa.gov/OC5/WOD/prwod.html.In the study area，the datasets is fairly distributed.It creates an opportunity for research about variability of water temperature and salinity in study area.The study is done including the water temperature profile and classification of water mass that present in SSCS.The southern South China Sea（SSCS）is highly influenced by two major monsoons which is northeast and southwest monsoon.Study about seasonal changes due to water temperature and salinity dynamics is done based on the seasonal changes.According to Wyrtki（1961），seasonal variability in SSCS is divided into six periods as described in Table 1.The study done by previous researchers always regarding to transitional period，but there was no fixed classification of each period from them.