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2. Foraminiferal Paleoproductivity During Holocene in Sunda Strait

Author

Budiarto, Eldian Yosua, Hendrizan, Marfasran, Setijadi, Rachmad, Troa, Rainer Arief, Zuraida, Rina, Triarso, Eko, Basit, Abdul, editor, Yulihastin, Erma, editor, Cahyarini, Sri Yudawati, editor, Santoso, Heru, editor, Pranowo, Widodo S., editor, Slamet S., Lilik, editor, and Belgaman, Halda Aditya, editor

Published
2023
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5. Reconstruction of monsoon evolution in southernmost Sumatra over the past 35 kyr and its response to northern hemisphere climate changes

Author

Shengfa Liu, Hui Zhang, Xuefa Shi, Min-Te Chen, Peng Cao, Ziye Li, Rainer Arief Troa, Rina Zuraida, Eko Triarso, and Hendrizan Marfasran

Subjects
Late Pleistocene, Hydrodynamic conditions, Chemical weathering, Indian monsoon, Paleoclimate, Sumatra, Geography. Anthropology. Recreation, Geology, QE1-996.5
Abstract

Abstract Reconstruction of monsoon evolution in the tropical Indian Ocean and evaluation of its influence on large-scale ocean circulation and sea-air interaction processes can help us understand climate driving mechanisms. Herein, we used a gravity core SO184-10043 to present the marine sedimentary record from the southernmost Sumatra, spanning the past 35 kyr. The age model is well constrained by 12 accelerator mass spectrometry (AMS) radiocarbon dates determined in mixed planktic foraminifera. We also measured sediment grain size and major and trace elements to reconstruct the variations in hydrodynamic conditions and chemical weathering intensity. These data were then used to reveal the evolution of the northwest (Indonesian) monsoon system over the past 35 kyr. The results showed that both monsoon current and chemical weathering coincided with summer insolation in the Northern Hemisphere and responded to glacial-interglacial climate changes in the northern Atlantic. Higher grain-size values of sensitive components, increased chemical index of alteration (CIA), and Ba/Sr ratios, together with lower CaO/MgO ratios, reflect a stronger monsoon current and chemical weathering during the late marine isotope stage 3 and Holocene. Higher intensity of chemical weathering might be attributed to a stronger northwest monsoon carrying warm and moist air from the Asian continent to Indonesian waters. Lower values of sensitive components, CIA, and Ba/Sr, along with higher CaO/MgO values, reveal a weaker monsoon current and lower intensity of chemical weathering during the last glaciation-deglaciation phase, which was controlled by a weaker monsoon system. At a millennial timescale, cold events occurred during the following intervals: 30–26 ka BP, Heinrich Stadial 1 (HS1; 18–15 ka BP), Last Glacial Maximum (LGM; 23–18 ka BP), Younger Dryas (YD; 11–10 ka BP), and 8.2 ka BP. The same cold events were identified from core SO184-10043, indicating a perfect match with climatic cooling in the Northern Hemisphere. We also observed periodicities of ~ 7.9 ka, 3.0–3.1 ka, 2.2–2.3 ka, and ~ 1.0 ka in our core records. These periodicities are coincident with solar-induced climate changes and support the hypothesis that monsoon evolution in the tropical Indian Ocean during the late Pleistocene coincided with the climate change in the Northern Hemisphere.

Published
2020
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11. Geodynamic control on Pleistocene coral reef development: insights from northwest Sumba Island (Indonesia)

Author

De Gelder, Gino, Solihuddin, Tubagus, Utami, Dwi Amanda, Hendrizan, Marfasran, Rachmayani, Rima, Chauveau, Denovan, Authemayou, Christine, Husson, Laurent, Cahyarini, Sri Yudawati, De Gelder, Gino, Solihuddin, Tubagus, Utami, Dwi Amanda, Hendrizan, Marfasran, Rachmayani, Rima, Chauveau, Denovan, Authemayou, Christine, Husson, Laurent, and Cahyarini, Sri Yudawati

Abstract

The fossil record of Quaternary reef systems, as expressed in uplifted regions by sequences of stacked terraces, has been extensively used to either understand their morphodynamics, or to unravel sea-level variations. Yet, because these two aspects are intimately linked, Quaternary reef analysis is often underdetermined because the analysis often focuses on single sequences, along one-dimensional profiles. Here, we take advantage of the lateral variations of coral reef sequences by documenting the morphological variations of the reef sequence on Sumba Island. Near Tambolaka, Northwest Sumba, we analyzed a reef transect, topography, and associated sedimentological record to obtain a precise coral reef stratigraphy and geomorphic patterns that can be compared to the well documented eastern counterpart. In Tambolaka, the reef sequence displays four lower layers of bedded chalky limestone units with a weakly cemented sandy matrix, which we attribute to the Middle Miocene to Pliocene Wakabukak formation based on calcareous nannofossils and planktonic foraminifers. The uppermost layer is a calcretized reefal limestone unit with a well-lithified sandy matrix, which we attribute to the Plio-Pleistocene reef sequence of the Kalianga formation. Seven marine terraces imprint the regional morphology, four of which we correlate with MIS 5e, MIS 7e, MIS 9e, MIS 11c terraces of Cape Laundi, Northeast Sumba. When scrutinized at the light of numerical models of reef development, these results indicate that the morphodynamics of reefal sequences is strongly impacted by the tectonic evolution. The geodynamic context sets both the extrinsic conditions of reef development, such as the morphology of the basement and hydrodynamics, but also the intrinsic properties, in particular reef growth rate. While the morphodynamic evolution of the sequence is at first order representative of the interplay between uplift rates and sea-level oscillations, the detailed assemblage of the reef units dra

Published
2023
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14. Reconstruction of monsoon evolution in southernmost Sumatra over the past 35 kyr and its response to northern hemisphere climate changes

Author

Ziye Li, Rainer Arief Troa, Peng Cao, Eko Triarso, Rina Zuraida, Hendrizan Marfasran, Xuefa Shi, Shengfa Liu, Hui Zhang, and Min-Te Chen

Subjects
Monsoon of South Asia, Marine isotope stage, Chemical weathering, Indian monsoon, 010504 meteorology & atmospheric sciences, Paleoclimate, lcsh:QE1-996.5, Northern Hemisphere, lcsh:Geography. Anthropology. Recreation, Sumatra, Last Glacial Maximum, 010502 geochemistry & geophysics, Monsoon, 01 natural sciences, Hydrodynamic conditions, lcsh:Geology, Oceanography, Late Pleistocene, lcsh:G, Paleoclimatology, General Earth and Planetary Sciences, Younger Dryas, Holocene, Geology, 0105 earth and related environmental sciences
Abstract

Reconstruction of monsoon evolution in the tropical Indian Ocean and evaluation of its influence on large-scale ocean circulation and sea-air interaction processes can help us understand climate driving mechanisms. Herein, we used a gravity core SO184-10043 to present the marine sedimentary record from the southernmost Sumatra, spanning the past 35 kyr. The age model is well constrained by 12 accelerator mass spectrometry (AMS) radiocarbon dates determined in mixed planktic foraminifera. We also measured sediment grain size and major and trace elements to reconstruct the variations in hydrodynamic conditions and chemical weathering intensity. These data were then used to reveal the evolution of the northwest (Indonesian) monsoon system over the past 35 kyr. The results showed that both monsoon current and chemical weathering coincided with summer insolation in the Northern Hemisphere and responded to glacial-interglacial climate changes in the northern Atlantic. Higher grain-size values of sensitive components, increased chemical index of alteration (CIA), and Ba/Sr ratios, together with lower CaO/MgO ratios, reflect a stronger monsoon current and chemical weathering during the late marine isotope stage 3 and Holocene. Higher intensity of chemical weathering might be attributed to a stronger northwest monsoon carrying warm and moist air from the Asian continent to Indonesian waters. Lower values of sensitive components, CIA, and Ba/Sr, along with higher CaO/MgO values, reveal a weaker monsoon current and lower intensity of chemical weathering during the last glaciation-deglaciation phase, which was controlled by a weaker monsoon system. At a millennial timescale, cold events occurred during the following intervals: 30–26 ka BP, Heinrich Stadial 1 (HS1; 18–15 ka BP), Last Glacial Maximum (LGM; 23–18 ka BP), Younger Dryas (YD; 11–10 ka BP), and 8.2 ka BP. The same cold events were identified from core SO184-10043, indicating a perfect match with climatic cooling in the Northern Hemisphere. We also observed periodicities of ~ 7.9 ka, 3.0–3.1 ka, 2.2–2.3 ka, and ~ 1.0 ka in our core records. These periodicities are coincident with solar-induced climate changes and support the hypothesis that monsoon evolution in the tropical Indian Ocean during the late Pleistocene coincided with the climate change in the Northern Hemisphere.

Published
2020

15. Centennial-millennial climate variability in the Makassar Strait during early Holocene until the end of the last deglaciation

Author

Hendrizan, Marfasran, Ningsih, Nining Sari, Cahyarini, Sri Yudawati, Putri, Mutiara Rachmat, Setiadi, Bambang, Anwar, Iwan P, Utami, Dwi Amanda, and Agusta, Vera C

Abstract

Supplementary figures consist of two figures Suppl. Figure 1.Histogram of interpolated SO217-18517 dataset. a. Normal distribution of sea surface temperature (SST), b. Normal distribution of δ18Osw, c. Normal distribution of δ18O Suppl. Figure 2. Coefficient correlation between original and interpolated SO217-18517 dataset. a. Sea surface temperature (SST), b. δ18Osw, c. δ18O

Published
2020
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28. Characteristics of Air Pollutants Sulfur Dioxide (SO2) and Nitrogen Dioxide (NO2) Using Passive Sampler Data 2016–2020 on the Air Quality Index in South Sumatra Province

Author

Radiana, Atep, Hamdi, Saipul, Wahya, Reza, Setyawati, Wiwiek, Sumaryati, Supriatin, Lilik Slamet, Tanti, Dyah Aries, Oktavia, Tri Sukma Dewi, Mirna, Yulia, Lestari, Sopia, editor, Santoso, Heru, editor, Hendrizan, Marfasran, editor, Trismidianto, editor, Nugroho, Ginaldi Ari, editor, Budiyono, Afif, editor, and Ekawati, Sri, editor

Published
2024
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34. The Estimation of Planetary Boundary Layer Height Over Land and Peat Fire-Prone Area in Kabupaten OKI of South Sumatra Indonesia Using Radiosonde Data

Author

Hamdi, Saipul, Radiana, Atep, Tanti, Dyah Aries, Adetya, Emmanuel, Sumaryati, Setyawati, Wiwiek, Kombara, Prawira Yudha, Rizal, Syahril, Suroyo, Heri, Mirna, Yulia, Noviastuti, Nindia, Lestari, Sopia, editor, Santoso, Heru, editor, Hendrizan, Marfasran, editor, Trismidianto, editor, Nugroho, Ginaldi Ari, editor, Budiyono, Afif, editor, and Ekawati, Sri, editor

Published
2024
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41. Designing Climate Change Adaptation Action for Bogor City

Author

Adi, Ryco Farysca, Perdinan, Prabowo, Raden Eliasar Tjahyono, Wibowo, Arif, Pratiwi, Syafararisa Dian, Aprilia, Suvany, infrawan, Delta Yova Dwi, Lestari, Sopia, editor, Santoso, Heru, editor, Hendrizan, Marfasran, editor, Trismidianto, editor, Nugroho, Ginaldi Ari, editor, Budiyono, Afif, editor, and Ekawati, Sri, editor

Published
2024
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