Measurements of Wet Deposition of Black Carbon in the Arctic Field Campaign Report

• Main Authors: Kondo, Yutaka, Zhao, Yongjing, Sinha, P R
• Language: unknown
• Published: 2019
• Subjects: Arctic; Kondo; black carbon
• Online Access: http://www.osti.gov/servlets/purl/1425651; https://www.osti.gov/biblio/1425651

We measured BC number and mass concentrations (CNBC and CMBC) in snow and rain samples using a single-particle soot photometer (SP2) combined with a nebulizer (Nebulizer-SP2). The effect of the coagulation of BC particles suspended in water on the measurement of BC size distribution has been shown to be negligible under typical BC number concentrations in water based on theoretical calculations and laboratory experiments (Moteki and Mori 2015; Mori et al., 2016). The stability of the CMBC values during the storage of water samples was evaluated using rainwater samples (Ohata et al., 2013; Mori et al., 2016). The diameter range of BC measured by SP2 used to be about 70-4170 nm (Mori et al., 2016). The size distributions of BC are very useful for detailed studies of the microphysical processes of wet removal of BC particles (Moteki et al., 2012; Kondo et al., 2016; Ohata et al., 2016) and for understanding the microphysical properties of BC in snow and rain. Size distributions are also needed to calculate the radiative effects of airborne BC particles and of those deposited on snow (Schwarz et al., 2013; Moteki et al., 2017). We calculated CNBC and CMBC by integrating the number and mass size distributions.