Dr. Cassandra J. Gaston March 18, 2014
9
Single-particle insights into the influence of biological activity on sea spray aerosol mixing-state Dr. Cassandra J. Gaston March 18, 2014
description
Single-particle insights into the influence of biological activity on sea spray aerosol mixing-state. Dr. Cassandra J. Gaston March 18, 2014. Aerosol Time-of-Flight Mass Spectrometer (ATOFMS). Inlet. Ellipsoidal Mirrors. Particle Inlet. Scattering Lasers (532 nm). Particle Sizing. PMT. - PowerPoint PPT Presentation
Transcript of Dr. Cassandra J. Gaston March 18, 2014
Single-particle insights into the influence of biological activity on
sea spray aerosol mixing-state
Dr. Cassandra J. GastonMarch 18, 2014
Aerosol Time-of-Flight Mass Spectrometer (ATOFMS)
ParticleInlet
ParticleSizing
ParticleComposition
PMT
Scattering Lasers(532 nm)
EllipsoidalMirrors
Nd:YAGLaser (266 nm)Detectors
Reflectron
+ ions - ions
Gard, E. et al. (1997) Anal. Chem, 69, 4083-4091.
Inlet
Size and Chemistry of Single Particles in real-time
Chemical Fingerprints of Particle Sources and Age
Fresh SS HNO3, N2O5 Reacted SS
HCl, ClNO2
Atmospheric processing of particles from different sources in real-time
Marine Organic Material and Sea Spray Aerosol
Bigg, E.K. (2007) Environ. Chem., 4 (3), 155-161Facchini, M.C. et al. (2008) Geophys. Res. Lett., 35, L17814, doi:10.1029/2008GL034210Hawkins, L.N. & Russell, L.M. (2010) Advances in Meteorology, doi:10.1155/2010/612132Meskhidze , N. & Nenes, A. (2006) Science, 314 (5804), 1419-1423O’Dowd, C.D. et al. (2004) Nature, 431 (7009), 676-680
Low Biological Activity High Biological Activity
Sea Salt (NaCl)
Sea Salt + Organic Material
Sea Salt
Organic MaterialMicroorganismsOrganic enrichment in ejected aerosol compared to seawater due to
biological activityHow are organics mixed in sea spray?
How will this affect water uptake and cloud formation?
Observations of Unique Ocean-Derived Particles
Gaston, C.J. et al. (2011) J. Geophys. Res., 116, D18310, doi:10.1029/2010JD015289
•Shipboard measurements: INDOEX (Indian Ocean) and ACE-Asia (Pacific Ocean)•Coastal measurements: CIFEX (N. California Coast)
Evidence for a Biological Source for Mg-type Particles
Gaston, C.J. et al. (2011) J. Geophys. Res., 116, D18310, doi:10.1029/2010JD015289
Mg-type particles associated with proxies for marine biological activity
Potential Sources for Mg-type Particles
Casillas-Ituarte, N.N. (2010) PNAS, 107, 6616-6621Leck, C. & Bigg, E.K. (2005) Tellus, 57, 305-316Orellana, M.V. et al. (2011) PNAS, 103, 13612-13617Wells, M.L. (1998) Nature, 391, 530-531
MgMg
MgMg
MgMg
Sea Salt (NaCl)
Mg2+
Mg2+
Mg2+
Mg2+
Mg2+Mg2+
Mg2+
Mg2+
• Potential role of exopolymeric material on atmospheric chemistry
• Mg enrichment on particle surface could affect trace gas uptake and cloud formation
Conclusions: How Does Biological Activity Impact Sea Spray Aerosol Chemistry?
• Ambient data shows sea spray particles enriched in organic and inorganic compounds (Mg-type particles)
• Mg-type particles provide insight into single-particle diversity of sea spray aerosol influenced by biological activity– Implications for parameterizing sea spray aerosol in
climate models
Acknowledgments• Joel Thornton Funding• Kim Prather -NSF• Thornton Group -California Air• Prather Group Resources Board• NOAA/PMEL– Tim Bates– Trish Quinn
Thank you for listening!
