Comment on acp-2021-411

Abstract

In this paper, authors reported the measurement results of refractory black carbon (rBC) measured using a single particle soot photometer (SP2) in relation to the meteorological variabilities in winter season on the North China Plain. A co-located instrument, highresolution aerosol mass spectrometer (HR-AMS) measured the chemical composition of submicron non-refractory species in addition to rBC, which was beneficial to discuss the changes in the coating of rBC particles. Furthermore, a wide range of air temperature detected during the observation period is a unique feature for investigating the changes in the particle microphysical properties of rBC under different meteorological conditions. The topics with which this paper deals meet the scope of Atmospheric Chemistry and Physics. There are some points to be addressed before accepting this manuscript. Please consider the following comments for the revision.