SEASONAL VARIATIONS OF NUTRIENT BUDGETS IN JAKARTA BAY, INDONESIA

Authors

  • Mochamad Saleh Nugrahadi Agency for the Assessment and Application of Technology (BPPT).
  • Seno Aji Agency for the Assessment and Application of Technology (BPPT).
  • Tetsuo Yanagi Research Institute for Applied Mechanics. Kyushu University.
  • Iwan G. Tejakusuma Agency for the Assessment and Application of Technology (BPPT).
  • Rahmania A. Darmawan Agency for the Assessment and Application of Technology (BPPT).

DOI:

https://doi.org/10.14203/mri.v35i1.7

Keywords:

Nutrient budget, Biogeochemistry, Jakarta Bay

Abstract

This study aims to quantify the fluxes of carbon, nitrogen, phosphorus, and silicate in Jakarta Bay and use these flux data to gain an initial understanding of the biogeochemical processes occurring in the system. We investigated water, suspended matter and sediments fluxes from estuarine, coastal water and outside of the bay. Water samples were analyzed for dissolved nutrients, chlorophyll-phytoplankton abundance, and their composition. Suspended matter and sediment were analyzed for carbon and nitrogen. Nutrient concentrations were high in the rivers or estuaries and then decreased rapidly seaward. Calculation budget results showed that Jakarta Bay is a sink for DIP, DIN and DSi during dry season and rainy season. In the dry season, the system is in the slightly fixation condition ([nfix-denit] = 0.03 mmol N m-2 d-1). In contrast, denitrification exceed nitrogen fixation ([nfix-denit] = -9.74 mmol N m-2 d-1) in the rainy season. Moreover, the bay produced net carbon about 2.6-32 mmol C m-2 d-1.

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Published

2026-01-08

Issue

Vol. 35 No. 1 (2010)

Section

Articles