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

Abstract 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 CO 2 variations. However, these factors are not enough. Surface CO 2 flux and transboundary transport needs to be considered as well.