Sea Level Rise in The Java Sea Based on Altimetry Satellites Data Over 1993-2015

At any location, sea level changes over time due to many wells understood factors (ocean mass-induced, thermal expansion, etc.). By varied time series data, this research is purposing to get the rising sea level in the Java Sea related to thermal expansion and tide. Sea Level Anomaly (SLA) Altimetry data is supported by SST (Sea Surface Temperature) and SSH (Sea Surface Height) of tide measurement. SST is indicated relating to thermal expansion by surface distribution observed of SLA and SST. Both data trends are calculated by linear regression per grid of Java Sea area. Tidal components are determined by using FFT method to support long period data. The result showed the rising sea level increased up to 0,0039 m/year and followed by the increasing of SST for about 0,027° C/year over 23 years. Sea level rises and related positively to the rises SST produced by 0,56 paired statistic correlation. Temporally both tend to has the similarity in a yearly pattern on long-term period while short period shows the spatial relation. The lowest sea level falling trend occurred in 1997 and the highest rising trend in 2010. It is supported by El Nino and La Nina events. Based on the results, rising and falling rate of sea level in the Java Sea are highly related to the events through ONI (Oceanic Niño Index) value.