Air-Sea Co2 Gas Exchange In Nasik Strait Waters, Belitung

Abstract

Marine carbonate system plays an important role in the air-sea CO2 gas exchange. The aim of the present study is to investigate the air-sea flux of CO2 in Nasik Strait, Belitung. Field observation was carried out during April, 2010, where the observed parameters are consisted of temperature, salinity, pH, dissolved inorganic carbon (DIC), total alkalinity (TA), primary productivity of phytoplankton and nutrients (phosphate and silicate). Partial pressure of CO2 (pCO2) in sea surface was particularly calculated using ABIOTIC model of the ocean carbon cycle model intercomparison project phase-2. Analysis results of the marine carbonate system show that generally Nasik Strait waters is played as a source (release) of CO2 to the atmosphere. The CO2 flux in mangrove waters, coral reef waters and coastal waters (non mangrove and coral reef) ranged between 3.06–3.19, 0.96–1.45 and 2.77–2.98 mmolC/m2/day, respectively. The present study found that the CO2 uptake by phytoplankton (photosynthesis) was not significantly affect the CO flux, however the decomposition of particulate organic carbon tended to give significant contribution to the CO2 flux.