AIR-SEA FLUX OF CO2 IN THE WATERS OF KARIMUNJAWA ISLAND, INDONESIA

*Nurul Latifah scopus  -  Departement of Aquatic Resources, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Indonesia
Sigit Febrianto  -  Departement of Aquatic Resources, Faculty of Fisheries and Marine Science, Universitas Diponegoro, Indonesia
Anindya Wirasatriya  -  Dept. of Oceanography, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro, Indonesia
Hadi Endrawati  -  Dept. of Marine Science, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro, Indonesia
Muhammad Zainuri  -  Dept. of Oceanography, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro, Indonesia
Suryanti Suryanti  -  Dept. of Aquatic Resources, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro, Indonesia
Andreas Nur Hidayat  -  Fish and marine resource management laboratory, Faculty of Fisheries and Marine Sciences, Universitas Diponegoro, Indonesia
Received: 27 Sep 2020; Published: 23 Oct 2020.
Open Access
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Abstract

The purpose of this study was to determine the distribution of CO2 flux in Karimunjawa in the east monsoon.  The variables in this study were temperature; pH; salinity; DO; CO2 atm was measured using a CO2 meter; chlorophyll-a, phosphate, silicate were measured spectrophotometric method. Total Alkalinity / TA was measured using the titration method with the principle of changing pH; DIC (Dissolved Inorganic Carbon) was measured using CO2sys software. The partial pressure of seawater carbon dioxide calculated using formula: pCO2sea = 6.31T2 + 61,9 Chla2 – 365.85T – 94.41 Chl-a +5715.94, the partial pressure of atmospheric carbon dioxide calculated using formula: pCO2atm = xCO2atm (pb - pH2O).  The calculation of the estimated CO2 flux using the formula: Flux CO2 = Kh x kwa x (∆pCO2)  , if the CO2 flux has a positive value water acts as a CO2 source, and if it is negative, the waters act as a CO2 sink..  CO2 flux in Karimunjawa waters during east monsoon (represented by August 2018) showed that in Karimunjawa waters with normal pH 7.2-7.4 were dominated by bicarbonate ion HCO3-with an average value of  DIC 1847.24 µmol/kg dan TA 1912.51 µmol/kg.  The partial pressure of seawater CO2 is higher than the partial pressure of atmospheric CO2  this indicates that the role of Karimunjawa waters as a source of CO2 where there is release of carbon dioxide into the atmosphere with CO2 flux values ranging from 8.549 – 13.272 mmol m-2 day-1.  The variables that affect the flux of CO2 were the pCO2sea and ΔpCO2 with a very strong and positive correlation. These two variables were influenced by sea water temperature, salinity, chlorophyll-a, phosphate and silicate.

Keywords: CO2 Flux; pCO2; DIC; TA; Karimunjawa

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