STRATIFIKASI DAN STRUKTUR MASSA AIR LAUT BANDA SAAT MUSIM TIMUR

Abstract

The Banda Sea, a part of the Eastern Arlindo line which is also an area of upwelling that varies seasonally depending on the season's direction, plays an important role as a temporary reservoir of water masses. This research is part of the Jala Citra 2-2022 Banda Expedition which aims to study the stratification of water masses in the Banda Sea. The sampling process uses CTD Rosette at 6 observation stations which includes temperature, salinity and density data. Water mass stratification analysis is used to see the layering of water mass, while the core layers analysis, isopicnal analysis, and TS diagram analysis is used for water mass structure analysis. The results showed that the variations in temperature, salinity and density are quite large in the surface layer. In the thermocline layer, a mass of water with maximum salinity (Smax) is found reached 34,79 Psu, the temperature range is 17,09-230C with isopicnal 23,99-25,45 Kg/m3 which is at a depth of 106-187 m. At the bottom of the thermocline, a mass of water with maximum salinity (Smax) is found reached 34,81 Psu, the temperature range is 8,67-12,790C and isopicnal 26,41-27,01 Kg/m3 with a depth of 230-402 m. The minimum salinity (Smin) is found at isopicnal 26,11-26,56 Kg/m3 with salinity reaching 34,36 Psu at a depth of 234-324 m with a temperature range of 10,60-12,580C. In the deep layer, water masses are found with a salinity range of 33,48-34,74 Psu at a depth of 674-1000 m with a temperature range of 4,59-6,940C and isopicnal more than 27 Kg/m3. The mass of water in the thermocline layer which has Smax believed to be the NPSW water mass. In the lower layer the thermocline is the character of the SPLTW water mass (Smax) while the mass of water which has Smin is the mass of water NPIW. In a deeper layer is the character of the AAIW water mass.