REKONSTRUKSI PERUBAHAN SUHU PERMUKAAN LAUT BERDASARKAN KUMPULAN FORAMINIFERA DI PERAIRAN UTARA PAPUA, SAMUDRA PASIFIK
Foraminifera is one of the best proxies used to determine the condition of paleoecology such as to determine sea surface temperature. Sea surface temperature is one of the important ecology parameters to distinguish the oceanography characteristic in a waters/basin. In this study, reconstruction of sea surface temperature (SST) in the North Papua Waters was conducted based on planktonic foraminifera abundance. For this study, we analyzed gravity core with code OS-07 taken during the Nusa Manggala Expedition 2018. This area was chosen because it is one of the ITF entrances, as branch of the global circulation. Therefore, the North Papua Waters are considered recording global climate events. Modern Analogue Technique (MAT) and foraminiferal grouping following the work of Parker (1960) in Boltovskoy and Wright (1976) were applied to this study. The results of temperature analysis using the two methods show the same trend changes. At intervals of 246-88 cm trophic zone foraminifera is not dominant while the subtropic, transitional, and subantartic foraminifera groups are increasing which interpreted to be relatively lower temperature conditions. Foraminifera at 88-0 cm depth intervals, trophic foraminifera group is increasing and dominant, interpreted by relatively higher temperature conditions. These results are in line with the SST results based on MAT from the foraminifera data collection that shows that there were two SST trends, depths of 246-86 cm and 86-0 cm. The transition of two trend, at a depth of 86 cm, is interpreted as the boundary of Pleistocene to Holocene. The average temperature difference in February is 1.33oC cooler on Pleistocene compare to Holocene and in August is 0.82oC cooler on Pleistocene compare to Holocene.