Surveying emissions of greenhouse gas CO2 in the canals of Ho Chi Minh city by floating chamber method

Abstract

Carbon dioxide (CO₂) is one of the most important greenhouse gases and atmospheric CO₂ concentrations have been recorded increasing. Floating chamber associated with Non-Dispersive Infrared (NDIR) technique as Licor-820 has been used for measuring the CO₂ flux F(CO₂) (mmol m^-2 h^-1) that emitted from the water surface on the various canals of Ho Chi Minh City. The highest values ​​at 3 sites: CH – Kenh Đoi, DBP – Kenh Nhieu Loc – Thi Nghe and CD – Rach Cau Son ranged from 35 to 186 mmol m^-2 h^-1 while much higher at OB site – Rach Ong Lon from 120–474 mmol m^-2h^-1.      

Climate characteristics also greatly affect the CO₂ emissions in natural waterways with low F(CO₂) values in dry season – the highest value fluctuated between 35 and 181 mmol m^-2 h^-1 while in the rainy season the highest F(CO₂) value was 446 mmol m^-2 h^-1 for OB site and ranged from 65 to 186 mmol m^-2 h^-1 for 3 other sites CH , DBP and CD. Pollution of waterways also affected on the CO₂ emissions.