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All Journal DIKSI Attoriolong IJOG : Indonesian Journal on Geoscience Tarbiyah Jurnal Ilmu-Ilmu Peternakan (Indonesian Journal of Animal Science) JGE (Jurnal Geofisika Eksplorasi) Fon: Jurnal Pendidikan Bahasa dan Sastra Indonesia PALITA: Journal of Social - Religion Research Sistemasi: Jurnal Sistem Informasi ISLLAC : Journal of Intensive Studies on Language, Literature, Art, and Culture Lingua Franca: Jurnal Bahasa, Sastra, dan Pengajarannya BASINDO : jurnal kajian bahasa, sastra Indonesia, dan pembelajarannya Syntax Literate: Jurnal Ilmiah Indonesia JMM (Jurnal Masyarakat Mandiri) Edukasi Islami: Jurnal Pendidikan Islam JENTERA: Jurnal Kajian Sastra Jurnal Edueco Sirok Bastra JURNAL AXIOMA : Jurnal Matematika dan Pembelajaran PROGRES PENDIDIKAN Wahana Karya Ilmiah Pendidikan Operations Research: International Conference Series Kibas Cenderawasih : Jurnal Ilmiah Kebahasaan dan Kesastraan Jurnal Impresi Indonesia Tarbiyah Islamiyah: Jurnal Ilmiah Pendidikan Agama Islam Center of Knowledge Bussman Journal : Indonesian Journal of Business and Management Palakka : Media and Islamic Coummunication SENTRI: Jurnal Riset Ilmiah Cendekiawan: Jurnal Pendidikan dan Studi Keislaman Berita Sedimentologi Amkop Management Accounting Review (AMAR) Jurnal Pengabdian Masyarakat Bangsa Waluya The International Science of Health Journal FAWAID: Sharia Economic Law Review Jurnal Sistem Informasi dan Manajemen Bisai: Jurnal Bahasa, Sastra dan Pengajarannya AKSIOMA
Aswan Aswan
Geology Department, Bandung Institute of Technology
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Journal : JGE (Jurnal Geofisika Eksplorasi)

 1 
LAST GLACIAL MAXIMUM – HOLOCENE RAINFALL SHIFTS IN THE WESTERN SAVU STRAIT BASED ON GEOCHEMICAL PROXIES Ardi, Ryan Dwi Wahyu; Aswan, Aswan; Maryunani, Khoiril Anwar; Yulianto, Eko; Putra, Purna Sulastya; Nugroho, Septriono Hari; Nurhidayah, Efrilia Mahdilah
JGE (Jurnal Geofisika Eksplorasi) Vol. 11 No. 2 (2025)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v11i2.493

Abstract

The Indo-Pacific Warm Pool significantly influences global atmospheric circulation, with tropical rainfall patterns highly sensitive to glacial–interglacial climate changes. During the Last Glacial Maximum (LGM), approximately 26,500 years before present, lower insolation, expanded ice sheets, and reduced sea levels weakened the Australian–Indonesian Monsoon (AIM) due to a southward shift of the Intertropical Convergence Zone (ITCZ). In contrast, the Holocene period experienced intensified monsoon systems and increased precipitation. However, high-resolution hydroclimate reconstructions from the western Savu Strait remain scarce. This study reconstructs rainfall variability from the LGM to the Holocene using geochemical proxies from sediment core ST10 (at 1 cm interval), located in the western Savu Strait. Three elemental ratios (Ti/Ca, K/Ca, and Rb/Sr) from X-ray fluorescence (XRF) core scanning were used to indicate terrigenous input, chemical weathering, and fluvial discharge. The age model was established using radiocarbon dating and stable isotope alignment with the Greenland ice core δ¹⁸O record. Log-transformed elemental ratios reveal four intervals of increased rainfall: the LGM, Heinrich Event 1 (HE1), Younger Dryas to Early Holocene, and the Late Holocene. These periods are characterized by elevated Ti/Ca, K/Ca, and Rb/Sr values, suggesting enhanced monsoonal rainfall and continental runoff. Conversely, lower proxy values during the Early Deglaciation, Bølling–Allerød, and Mid-Holocene indicate drier climatic conditions. These patterns align with regional proxy records from southwest Sumba and the Timor Sea, confirming the reliability of elemental ratios in reconstructing past hydroclimate variability. This study provides the first continuous record of rainfall shifts in the western Savu Strait from the LGM to Holocene and contributes to understanding long-term monsoon dynamics in southeastern Indonesia, highlighting the complex response of tropical hydroclimate to global climate forcing.
Co-Authors Abadina, Waode Abdul Kholik Abdul Pirol Adi, Tiomy Butsianto Agus Slamet Agus Tri Hascaryo, Agus Tri Aldri Frinaldi Anam, M. Khairul Anang Santoso Andawaty Anugrah, Aril Ardi, Ryan Dwi Wahyu Ardilah, Fatmawati Asmah Amir Asmaliah, Fifin Bahmid Bahri bahri Ciochon, Russell L. D. hartanto Dadang Hermawan Dahmul, Dahmul Darmawan, Taufik Djuliyanto, Erik Dwi Listyorini EKO YULIANTO Eva Yulia Puspaningrum Fauziah, Fenty Febrian, Muhammad Rully Firdaus Firdaus Fitra, Deni Fortuin, Anne Gandung Sugita Gatut Susanto Harun, Aziz Ilham Abu, Ilham Abu Ilham Ilham Imam Agus Basuki Imam Suyitno Jeri, Ahmat Jollis, Jollis karunia, Erick Lakum, Lakum Larick, Roy Louys, Julien M. Makbul Malik, Deni Marsha, Deni Maryunani, Khoiril Anwar Ma’mun Fikri, Ahmad Mihrani Mihrani MIKA RIZKI PUSPANINGRUM, MIKA RIZKI Muh. Irfandy Azis Muhammad Yani, Muhammad Najamuddin Najamuddin, Najamuddin Narti Narti, Narti Ningsih, Indah Widyah Nuny Sulistiany Idris Nur Anisa Nuraini Nuraini Nurhadi, Jatmika Nurhidayah, Efrilia Mahdilah Nursyamsiah, Nunung Oktavi, Nadia Silmi Pratiwi Putri, Dina Eki Prayoga, Hanna Arsyinta Price, Gilbert J. Purawijaya, Handrian Purawijaya, Handrian Rahman Purna Sulastya Putra, Purna Sulastya R. Triyono Rahman, Miftah Rahmawati, Rahmawati Restu Misrianti Rosita Rahma S Rijani S., Fathur Rahman Saafi, La Ode Safira, Nurul Safrin Salam Septriono Hari Nugroho Smith, Holly Sudarman Sudarman Suhardi Suhardi Sukri, Phil Sukri Sultan, Iqbal Syahri, Moch. Syams, Tengku Putri Azizah Tahir, Muhammad Sakti Titik Harsiati U. Setiyono Ummul Khair Utomo, Candra Hadi Vera Anitra Wibowo, Kenny Agusto Arie Widia, Ida Y. Riza Y. Rizal Y. Zaim Yahdi Zaim Yan Rizal, Yan Yudhicara Yudhicara Zainal Abidin Zonneveld, John-Paul Zumarni