SEA WATER pCO2 ESTIMATING MODEL AND ANALYSIS OF SEA - AIR CO2 GASES EXCHANGE IN THE WESTERN JAVA SEA

• Main Author: Hermawan, Wawan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/33386
• Institution: Institut Teknologi Bandung

Analysis of carbon dioxide (CO2) gases exchange between sea surface water and air in the Western Java Sea has been considering based on partial pressure of CO2 (pCO2). Two model using polynomial regression method has been developed for the estimation of sea water pCO2 based on The South China Sea - Indonesian Seas Transpor/Exchange (SITE) in situ data and was calculated using satellite data of sea surface temperature (SST), sea surface salinity (SSS) and Chlorophyll-a concentration. Model 1 is the estimating model with including in situ SST and Chlorophyll- a concentration data only, the correlation coefficient (R2) and relative kesalahan were obtained about 0.774 and 8.19%, respectively. Model 2 is the estimating model with adding predictor variable, thus consist of SST, chlorophyll - a concentration and SSS, were obtained R2 and relative error about 0.774 and 8.07%, respectively. Model 1 was better used on the shore and estuaries region than Model 2 with relative error of 13.3% and 13.89%, respectively. Additional of salinity variable to the model is disagree to use on the near shore and estuaries region. The result of calculating of sea water pCO2 using Model 1 and Model 2 on seasonal period had highest magnitude on the first transitional monsoon season with peak was found in April of 450 - 570 ppm and lowest magnitude on the west monsoon season with peak was found in January of 400 - 500 ppm. The CO2 gas exchange which is represented by flux showed that the Western Java Sea was source of CO2 region with the highest magnitude was found on the east monsoon season about 0.0579 mol C/m2 month and lowest magnitude was found in the west monsoon season about 0.0063 mol C/m2 month. El Niño Southern Oscillation (ENSO) with anomaly index of 2.2oC and Indian Ocean Dipole (IOD) positive phase th anomaly index of 0.86oC do simultaneously with second transitional and west monsoon season influenced to decreasing of sea water pCO2 for about 1.68 to 3.8 ppm or around 0.3 to 0.7% and caused flux increase in 2012 to 2015 period for about 0.000039 to 0.00009 mol C/m2 month or around 15.4% to 33.9%.