Ice nucleation observation raw data

This study used a novel designed experimental setup to online measure the INPs concurrently for the ambient and heated aerosols (at 350 ℃), using a continuous flow diffusion chamber (CFDC) and other composition measurements. The difference between both measurements reflects the IN activities for non-refractory OA. We found the more oxygenated OA produced by photooxidation at noon preferentially acted as INPs. Our results give first direct evidence that the organic aerosols from anthropogenically polluted region could importantly contribute to the INPs well above the homogeneous ice nucleation temperature, when in high oxidation state and lower ambient relative humidity. Considering the abundant OA loadings over global scale, the role of OA in modulating ice number concentration and its potential consequent impacts on weather and climate should be attended.