1. Jennifer Murphy, Greg Wentworth Department of Chemistry, University of Toronto NH 4 + (aq) NH 3(g) DMS (aq) DMS (g) SO 2(g) H 2 SO 4(g) MSA (g) neutralization

2. Range of Arctic Marine Boundary Layer NH 3

3. MBL Aerosol Neutralization and Acidity

4. NH 4 + (aq) NH 3(g) DMS (aq) DMS (g) SO 2(g) H 2 SO 4(g) MSA (g) Nitrogenous Bases and New Particle Formation New particle formation RNH 2(g) RNH 3 + (aq) organic amines e.g. Almeida et al., Nature, 2013 Dawson et al., PNAS, 2012

5. Atmos Chem Phys, 2013 SO4 NH4 org Riddick et al., Atmos Env, 2012

6. Chang et al., JGR-Atmos, 2011 Do emissions from Arctic seabird colonies influence particle growth/formation?

7. Ambient Ion Monitor-Ion Chromatograph (AIM-IC) Greg Wentworth (3 rd Year PhD, U of T Chemistry) Simultaneous quantification of water soluble gases & PM 2.5 – Hourly time resolution, on Amundsen Will optimize for MSA, anything else…? Markovic et al. (2012) J. Environ. Monit., 14, 1872. PM 2.5 ~LoD (ug/m 3 )Gas Phase~LoD (ppb) Na + 0.03 Na - NH 4 + 0.01 NH 3 0.02 K+K+ 0.004 K - Mg 2+ 0.002 Mg - Ca 2+ 0.002 Ca - Cl - 0.006 HCl 0.003 NO 2 - 0.003 HONO 0.02 NO 3 - 0.02 HNO 3 0.02 Br - 0.2ng/m 3 HBr 0.2ppt SO 4 2- 0.002 SO 2 0.001 Acetate 0.008 Acetic Acid 0.05 Formate 0.008 Formic Acid 0.1 Oxalate 0.005 Oxalic Acid 0.003 Amines* ~1pg/m 3 Amines* ~0.1ppt *VandenBoer et al. (2012) J. Chrom. A, 1252, 74.