STUDY OF THERMAL FRONT CHARACTERISTICS AROUND BALI SEA USING SATELLITE IMAGE DATA AND GEOGRAPHIC INFORMATION SYSTEM (GIS)

• Main Author: Elstefani, Rosalita
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/45891
• Institution: Institut Teknologi Bandung

Sea surface temperature (SPL) is one of an important oceanographic parameter to be known for study about oceanography phenomena, such as thermal front. Front is important in marine water productivity because it tends to bring together the cold water with rich nutrients. The purpose of this study is to determine the characteristics of thermal front in Bali Sea which include the duration and intensity Geographic Information System (GIS) technics. The research data are in the form of primary data of Aqua satellite image MODIS Level-3, with spatial resolution of 0.05o x 0.05o and monthly temporal resolutions, as monthly data from January 2013 to December 2015. The result shows that the Bali sea surface temperature experienced variations and fluctuations based on the pattern of seasons, where the average value of SST in the West Season is 29.68oC, in Transition Season I is 29.89oC, East Season is 27.74oC, and Transition Season II is 28.36oC. The intensity (?T) of the thermal front which ranges from 0.5o – 2.3oC for 4 – 7 months starting from April to October continuously in each year, with the strongest thermal front found in the Lombok Strait which has a range of intensity values (?T) of 1.0o to 2.3oC with an average duration of events for 6 months continuously each year. Thermal front in the combination of El Niño and IOD positive in 2015, with a range of intensity (?T) of 0.5oC – 2.0oC. This shows that the presence of inter-annual anomalies does not have a significant effect on the duration and intensity of average thermal front events. Unlike in 2016 in the combination of La Niña and IOD negative in 2016, the inter-annual anomaly phenomenon has an effect on the mean value of SPL turned to be warmer than normal conditions, so that the SPL value tends to be homogeneous and caused decrease in intensity and duration of thermal front in almost all study areas.