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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 20 Jun 2019

Submitted as: research article | 20 Jun 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Holocene and Common Era sea level changes in the Makassar Strait, Indonesia

Maren Bender1, Thomas Mann2, Paolo Stocchi3, Dominik Kneer4, Tilo Schöne5, Jamaluddin Jompa6, and Alessio Rovere1 Maren Bender et al.
  • 1University Bremen, MARUM – Center for MarineEnvironmental Sciences, Leobener Straße 8, 28359 Bremen, Germany
  • 2ZMT – Leibniz Centre for Tropical Marine Research, Fahrenheitsstraße 6, 28359 Bremen, Germany
  • 3NIOZ – Royal Netherlands Institute for Sea Research, 17907 SZ ’t Horntje, Texel, Netherlands
  • 4Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Hafenstrasse 43, 25992 List/Sylt, Germany
  • 5Helmholtz-Zentrum Potsdam – Deutsches GeoForschungsZentrum (GFZ), Telegrafenberg 14473 Potsdam, Germany
  • 6Graduate School, Hasanuddin University, Makassar,90245, Indonesia

Abstract. Indonesia is a country composed of several thousand islands, many of them small, low-lying and densely inhabited. These are, in particular, subject to high risk of inundation due to future relative sea level changes. The Spermonde Archipelago, off the coast of Southwest Sulawesi, consists of more than 100 small islands. This study presents a dataset of 24 sea-level index points from fossil microatolls, surveyed on five islands in the Spermonde Archipelago and compares these new results with published data from the same region and with relative sea level predictions from different Glacial Isostatic Adjustment (GIA) models. The newly surveyed fossil microatolls are located around the islands of Tambakulu, Suranti (both ~ 60 km offshore of Makassar city), Bone Batang and Kodingareng Keke (both located in the center of the Archipelago) and Sanrobengi (located ~ 20 km south-southwest of Makassar). Results from the near- and mid-shelf islands indicate that relative sea level between 4 to 6 ka BP was less than one meter above present sea level. The only exception to this pattern is the heavily populated island of Barrang Lompo, where we record a significant subsidence when compared to the other islands. These new results support the conclusions from a previous dataset and are relevant to constrain late Holocene ice melting scenarios. Samples from the two outer islands (Tambakulu and Suranti) yielded ages spanning the Common Era that represent, to our knowledge, the first reported for the entire Southeast Asian region.

Maren Bender et al.
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Maren Bender et al.
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Short summary
This paper presents 24 new sea level data points in the Spermonde Archipelago, Indonesia and the reconstruction of the local Late Holocene sea level history in combination with Glacio Isostasy Adjustment Models. We further show the importance of surveying living microatolls as modern analogs to fossil ones. Other interesting aspects are the potential subsidence of one of the densely populated islands and present eight samples that are dated to the Common Era.
This paper presents 24 new sea level data points in the Spermonde Archipelago, Indonesia and the...