RECONSTRUCTION OVER THE PAST 32000 BP OF CLIMATE CHANGE BASED ON FORAMINIFERA RECORDS IN PALABUHANRATU OFFSHORE, WEST JAVA

• Main Author: NURDIN (NIM: 22014310), NAZAR
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29589
• Institution: Institut Teknologi Bandung

<p align="justify">The modern climate of the Indonesian Seas is dominated by bi-annual monsoonal shifts. Heavy rain accompanies northwesterlywinds between November and March (Austral summer), during the Northwest (NW) Monsoon. The dry season corresponds to the Southeast (SE)Monsoon period from May to September (Austral winter. <br /> <br /> <br /> Foraminifera is a very sensitive microfauna to the environmental changes. So many studies have been conducted using this microfauna as a proxy to reconstruct paleoclimate. Therefore, the purpose of this study is to analyze the variability of ecology by using foraminifera. <br /> <br /> <br /> Based on calibration to isotope stratigraphy, the sediment of core so184-10043 has been deposited since 32064 BP. The core is consists of grey clay that abundant with foraminiferal test. Based on cluster analysis, the core can be divided into 4 biozones, with dominant species are Bulimina, Bolivina, Uvigerina, Bolivinita quadrilatera, from benthic, and the planktonic is dominated by Globigerinoides ruber, Neogloboquadrina dutertrei, Globigerina bulloides, and Pulleniatina obliqueloculata. The interval core studied is deposited in the bathyal setting which is characterized by 90% of PB ratio and the average of index diversity is higher than 3. <br /> <br /> <br /> During glacial Southeast Monsoon the intensity was stronger indicated by thinner mixed layer, lower temperature, higher productivity, and shallower thermocline. Furthermore, Northwest Monsoon was stronger during Interglacial reflected by warmer temperature, lower productivity, deeper thermocline, thicker mixed layer, and lower salinity. <br /> <br /> <br /> Percentage of Globigerina bulloides used as proxy for winter upwelling and winter intensity, Java upwelling relations with Indonesia-Australia monsoon period. Weak in Last Glacial maximum and las deglaciation, and strong in Middle Holocene. <br /> <br /> <br /> Generally, ITF intensity was stronger during glacial compared with that during interglacial. Weaker ITF is characterized by higher temperature, deeper thermocline, low salinity, and low intensity of bottom current, <br /> <br /> These occurrences were coincided with HE 6 – HE 4, HE <br /> <br /> 2, LGM, and during the climate changes between glacial - interglacial. <br /> <br /> <br /> The climate change were occurrences the climate changes between glacial – interglacial, thermocline intensity, monsoon change, upwelling, HE-3, Holocene Maximum, PME, and slowed sea level during post glasial.<p align="justify"> <br />