Factors influencing surface CO2 variations in LPRU, Thailand and IESM, Philippines

• University-based regional measurements of atmospheric CO2 in Thailand and the Philippines.
• Quantification of the effects of meteorology to surface CO2 variations.
• Usage of a Lagrangian transport model to infer influence locations in this region.

Surface carbon dioxide concentrations were measured using a non-dispersive infrared carbon dioxide sensor at Lampang Rajabhat University from April to May 2013 and at the University of the Philippines-Diliman campus starting September 2013. Factors influencing the variations in these measurements were determined using multiple linear regression and a Lagrangian transport model. Air temperature and sea level pressure were the dominant meteorological factors that affect the CO2 variations. However, these factors are not enough. Surface CO2 flux and transboundary transport needs to be considered as well.