Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years

Yuki Ota, Hodaka Kawahata, Masafumi Murayama, Mayuri Takeuchi, Yusuke Yokoyama, Yosuke Miyairi, Thura Aung, H. M.Zakir Hossain, Atsushi Suzuki, Akihisa Kitamura, Kyaw Thu Moe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Recent studies have revealed an intensification of the Indian Summer Monsoon (ISM) over the past 700 years, but its influence on the sediments in the northern Andaman Sea is unclear. To examine this influence, we used radiocarbon-dated sediment core StMY6, acquired 100 km offshore in the northern Andaman Sea from the Ayeyarwady River mouth, and obtained a 700-year-long record of the grain-size distribution and geochemistry of the sedimentary sequence. The ISM influences precipitation surrounding the Ayeyarwady River, and thus the river water and sediment discharges to the northern Andaman Sea near the river mouth in the Ayeyarwady River and the weathering intensity in the river catchment. Based on the system, we propose that higher sedimentation rates and larger modal grain size (the most abundant size in the grain-size distribution of sediments) and lower carbonate concentrations after about AD 1600 can be attributed to higher ISM intensity. Profiles of total organic carbon (TOC) content and carbon/nitrogen (C/N) ratios, however, did not show any trends after about AD 1600, which suggests that the ISM has had little influence on these proxies at this site.

Original languageEnglish
Pages (from-to)528-539
Number of pages12
JournalJournal of Quaternary Science
Volume32
Issue number4
DOIs
Publication statusPublished - May 1 2017

Fingerprint

monsoon
summer
river
grain size
sediment
sedimentary sequence
sedimentation rate
fluvial deposit
total organic carbon
sediment core
river water
weathering
geochemistry
effect
sea
Summer
Sediment
catchment
carbonate
nitrogen

Keywords

  • Andaman Sea
  • Ayeyarwady River
  • Indian Summer Monsoon
  • palaeoenvironments
  • sediments

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years. / Ota, Yuki; Kawahata, Hodaka; Murayama, Masafumi; Takeuchi, Mayuri; Yokoyama, Yusuke; Miyairi, Yosuke; Aung, Thura; Hossain, H. M.Zakir; Suzuki, Atsushi; Kitamura, Akihisa; Moe, Kyaw Thu.

In: Journal of Quaternary Science, Vol. 32, No. 4, 01.05.2017, p. 528-539.

Research output: Contribution to journalArticle

Ota, Y, Kawahata, H, Murayama, M, Takeuchi, M, Yokoyama, Y, Miyairi, Y, Aung, T, Hossain, HMZ, Suzuki, A, Kitamura, A & Moe, KT 2017, 'Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years', Journal of Quaternary Science, vol. 32, no. 4, pp. 528-539. https://doi.org/10.1002/jqs.2947
Ota, Yuki ; Kawahata, Hodaka ; Murayama, Masafumi ; Takeuchi, Mayuri ; Yokoyama, Yusuke ; Miyairi, Yosuke ; Aung, Thura ; Hossain, H. M.Zakir ; Suzuki, Atsushi ; Kitamura, Akihisa ; Moe, Kyaw Thu. / Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years. In: Journal of Quaternary Science. 2017 ; Vol. 32, No. 4. pp. 528-539.
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