RECONSTRUCTION OVER THE PAST 32000 BP OF CLIMATE CHANGE BASED ON FORAMINIFERA RECORDS IN UJUNG KULON OFFSHORE, WEST JAVA
<p align="justify">The modern climate of the Indonesian Seas is dominated by bi-annual monsoonal shifts. Heavy rain accompanies northwesterly winds between November and March (Austral summer), during the Northwest (NW) Monsoon. The dry season corresponds to the Southeast (SE) Monsoon...
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Format: | Theses |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/29590 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | <p align="justify">The modern climate of the Indonesian Seas is dominated by bi-annual monsoonal shifts. Heavy rain accompanies northwesterly winds 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 />
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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 />
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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 2 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 />
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During glacial, SE Monsoon the intensity was stronger indicated by thinner mixed layer, lower temperature, higher productivity, and shallower thermocline. Furthermore, NW Monsoon was stronger during Interglacial reflected by warmer temperature, lower productivity, deeper thermocline, thicker mixed layer, and lower salinity. <br />
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Percentage of G. bulloides used as proxy for winter upwelling and winter intensity. G. bulloides abundance indicates the relationship of Java upwelling relations with Indonesia-Australia monsoon. Java upwelling was weak during LGM and last deglaciation, and strong in Middle Holocene. <br />
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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 glacial. <p align="justify"> |
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