<p>Atmospheric Brown Carbon (BrC) is an important component of aerosol particles that Influences the climate through interactions with incoming solar and emitted terrestrial radiation. BrC can be generated from a variety of primary emissions (such as traffic, coal combustion, biomass burning) and secondary formation. Nitrophenols are classified as Brown Carbon due to their strong absorption in near-ultraviolet and visible regions.</p><p>A heated single path absorption spectroscopy system is been built to measure the cross section of nitrophenols. Due to its semi-volatility, the nitrophenols were introduced into the cell by N<sub>2</sub>. The cross section of nitrophenols is obtained by calculating the integrated absorption.</p><p>A Thermal Decomposition - Incoherent Broadband Cavity-Enhanced Absorption Spectroscopy (TD-IBBCEAS) system was setup for atmospheric measurement. This instrument covered the spectral region from 320 to 440nm which could contain the interested absorption of nitrophenols. A thermal decomposition device was used to heating the sample. &#160;The system was characterized based in laboratory experiment.</p>
