We built a differential optical absorption spectroscopy system to measure near-surface ${\mathrm{CO}}_2$ absorption in the atmosphere using a nanosecond white light continuum. The white light laser can cover wavelengths ranging from 420 to 2400 nm, where the ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ absorption lines are located. At an optical path length of 568 m, it was possible to evaluate atmospheric ${\mathrm{CO}}_2$ concentration from absorption bands of ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ in the vicinity of 2000 nm detected by broadband white light simultaneously.