[AAS07-12] Greenhouse gases and air quality monitoring system for urban anthropogenic emission estimation around Jakarta megacity
Keywords:greenhouse gases, air quality, urban monitoring, CO2 simulation, Indonesia
We have maintained continuous monitoring systems of CO2, CH4, CO, NOx, SO2, O3, aerosol concentrations (PM2.5, PM10, BC) and the chemical components (NO3-, SO42-) of PM2.5 and PM10, and meteorological parameters at three sites: Serpong (Jakarta suburb), Bogor (center of Bogor city), and Cibeureum (mountainous area, background-like site) since 2016/2017. We have also performed automatic flask sampling of ambient air once a week. The air samples are used to analyze N2O, SF6, and carbon isotopes (13C, 14C) in CO2 at NIES and to validate CO2, CH4, and CO data obtained from the continuous measurement.
We have also conducted high-resolution atmospheric CO2 simulations using the Weather Research and Forecasting model coupled to Chemistry (WRF-Chem). We used two emission inventories to prescribe the surface emissions: ODIAC (Open-source Data Inventory for Anthropogenic CO2) as fossil fuel CO2 (ffCO2) and MsTMIP (Multi-scale Synthesis and Terrestrial Model Intercomparison Project) as biogenic CO2 (bioCO2).
We analyzed the intersite differences of daytime CO2 mole fractions (dCO2) between the urban sites (Serpong, Bogor) and the background-like site (Cibeureum) in the dry season (July-August 2017) and the rainy season (January-February 2018). The observed dCO2 at Serpong was 8.7 and 0.9 ppm in the dry and rainy seasons, respectively. The simulated dCO2 at Serpong shows similar decreasing trend, which is 8.5 and 3.1 ppm in the dry and rainy seasons, respectively. While the simulated CO2 values at Serpong are slightly overestimated in the rainy season possibly due to the poor reproducibility of meteorological fields (wind environment near the surface), the simulation indicates two main factors of the seasonal differences in dCO2: one is the reduction of ffCO2 at Serpong in the rainy season (3.3 ppm) and another one is the reduction of bioCO2 uptake by photosynthesis at Cibeureum in the rainy season (2.9 ppm). The seasonal differences in dCO2 observed and simulated at Bogor are similar to those of Serpong, but smaller.
In our presentation, we will also present the relationship between CO2 and the other species.