Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/158585
Title: Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait
Authors: Martin, Patrick
Moynihan, Molly A.
Chen, Shuang
Woo, Oon Yee
Zhou, Yongli
Nichols, Robert S.
Chang, Kristy Y. W.
Tan, Ashleen S. Y.
Chen, Ying-Hsuan
Ren, Haojia
Chen, Mengli
Keywords: Science::Geology
Issue Date: 2022
Source: Martin, P., Moynihan, M. A., Chen, S., Woo, O. Y., Zhou, Y., Nichols, R. S., Chang, K. Y. W., Tan, A. S. Y., Chen, Y., Ren, H. & Chen, M. (2022). Monsoon-driven biogeochemical dynamics in an equatorial shelf sea: time-series observations in the Singapore Strait. Estuarine, Coastal and Shelf Science, 270, 107855-. https://dx.doi.org/10.1016/j.ecss.2022.107855
Project: MSRDP-P11 
MSRDP-P32 
NRF-NRI-2020-MESN 
Journal: Estuarine, Coastal and Shelf Science 
Abstract: Coastal tropical waters are experiencing rapid increases in anthropogenic pressures, yet coastal biogeochemical dynamics in the tropics are poorly studied. We present a multi-year biogeochemical time series from the Singapore Strait in Southeast Asia's Sunda Shelf Sea. Despite being highly urbanised and a major shipping port, the strait harbours numerous biologically diverse habitats and is a valuable system for understanding how tropical marine ecosystems respond to anthropogenic pressures. We observed strong seasonality driven by the semi-annual reversal of ocean currents: dissolved inorganic nitrogen (DIN) and phosphorus varied from ≤0.05 μmol l−1 during the intermonsoons to ≥4 μmol l−1 and ≥0.25 μmol l−1, respectively, during the southwest monsoon. Si(OH)4 exceeded DIN year-round. Based on nutrient concentrations, their relationships to salinity and coloured dissolved organic matter, and the isotopic composition of NOx−, we infer that terrestrial input from peatlands is the main nutrient source. This input delivered dissolved organic carbon (DOC) and nitrogen, but was notably depleted in dissolved organic phosphorus. In contrast, particulate organic matter showed little seasonality, and the δ13C of particulate organic carbon (−21.0 ± 1.5‰) is consistent with a primarily autochthonous origin. The seasonal pattern of the diel changes in dissolved O2 suggests that light availability controls primary productivity more than nutrient concentrations. However, diel changes in pH were greater during the southwest monsoon, when remineralisation of terrestrial DOC lowers the seawater buffer capacity. We conclude that terrestrial input results in mesotrophic conditions, and that the strait might undergo further eutrophication if nutrient inputs increase during seasons when light availability is high. Moreover, the remineralisation of terrestrial DOC within the Sunda Shelf Sea may enhance future ocean acidification.
URI: https://hdl.handle.net/10356/158585
ISSN: 0272-7714
DOI: 10.1016/j.ecss.2022.107855
DOI (Related Dataset): 10.21979/N9/2FQEGW
Rights: © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ASE Journal Articles
EOS Journal Articles
IGS Journal Articles

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