Variability of Aerosol Optical Properties at Four North American Surface Monitoring Sites

Atmospheric Properties from the 2006 Niamey Deployment and Climate Simulation with a Geodesic Grid Coupled Climate Model Fourth Quarter 2008

“…For example, at the ARM Climate Research Facility (ACRF) Southern Great Plains (SGP) site, the average total scattering coefficient is about 47 Mm -1 and the average absorption coefficient is about 2.5 Mm -1 (Sheridan et al, 2001;Delene and Ogren, 2001). Even after excluding major dust events during the dry season in Niamey, the average of total scattering is more than 120 Mm -1 with daily peaks routinely exceeding 150 Mm -1 .…”

Truncation and Angular-Scattering Corrections for Absorbing Aerosol in the TSI 3563 Nephelometer

“…Reid et al (2005) reportedÅngström values for extinction ranging from 1.6 to 2;å sp would be similar but not identical to these values. Delene and Ogren (2002) found …”

“…We assume an optical depth of 0.1, a low estimate of the average over the continental United States, and a land surface albedo of 0.22; we also assume a backscatter fraction of 0.13 (Delene and Ogren 2002). If the true SSA is 0.9, the clear-sky forcing of the aerosol column is about -1.2 W/m 2 , but if that value is estimated incorrectly as 0.93 (an error of 0.03), the aerosol forcing is -1.8 W/m 2 .…”

Source Sector and Region Contributions to Black Carbon and PM<sub>2.5</sub> in the Arctic

“…The spring phase (ARCTAS-A) which happened during April 2008, was concurrent with an unusually higher number of Siberian fires, which subsequently caused higher concentrations of carbonaceous aerosols (Fuelberg et al, 2010; Kondo et al, 2011;Liu et al, 2015;Matsui et al, 2011;McNaughton et al, 2011;Spackman et al, 2010;Wang et al, 2011;Warneke et al, 2009). Figure Oceanic and Atmospheric Administration (NOAA) Global Monitoring Division (GMD), where a particle soot absorption photometer (PSAP) is used for measuring BC light absorbing coefficient at three wavelengths (476, 530, and 660 nm) (Bodhaine, 1989;Bond et al, 1999;Delene and Ogren, 2002 ; Data is available at 10 https://esrl.noaa.gov/gmd/aero/net/). The Alert station, located in the northernmost Qikiqtaaluk region of Canada, is mostly isolated from both local and continental source regions.…”