Organic aerosols and cloud interactions
Project:
Organic aerosols and cloud interactions
PI: Lynn Russell
URL: http://aerosols.ucsd.edu/
Affiliation: Scripps Institution of Oceanography
Contact: lmrussell@ucsd.edu
Summary:
This project will collect and analyze two years of daily measurements of submicron organic aerosols and compare them with in-situ radiometric measurements and satellite products. The goal is to quantify the organic fraction of aerosols to understand their impact on Arctic haze, local cloud microphysics, and radiation balance of the polar region. The objective is to answer three main questions:
- what is the contribution of organics to Arctic indirect effects?
- what is the shortwave component of the first indirect effect in the Arctic?
3) is there a detectable liquid water path component of the indirect effect in Arctic clouds?
Technique:
Continuous shortwave radiometric measurements and particle sampling were started in January 2009 and will continue for 2 years. Teflon filters collect submicron particles for 24 or more hours in a NOAA-CMDL-type carousel and are sent back to laboratories to be scanned using Fourier Transform Infrared (FTIR, for organic functional groups) and X-ray Florescence (XRF, for heavier elements) (similar to Maria et al., 2002; 2003; Gilardoni et al., 2007). The sampling times for the filters are synchronized with the ongoing NOAA PMEL measurements of inorganic ions by ion chromatography (Quinn et al., 2002). Additionally, graduate student Patrick Shaw plans to participate in the 2009 OASIS intensive experiment during late March in Barrow to collect submicron particles for Near Edge X-ray Absorption Fine Structure (NEXAFS) and Scanning Transmission X-ray Microscope (STXM). This technique provides unique measurements of single particle morphology and reveals the complex partitioning of organic functional groups within individual particles (Takahama et al., 2007; 2008).
Maria, S. F., L. M. Russell, B. J. Turpin and R. J. Porcja (2002). "FTIR Spectroscopy of Submicron Aerosol Collected Aboard Aircraft with a Three-Stage Particle Concentrator: Method Development and Field Results." Atmos. Environ. 36: 5185-5196.
Maria, S. F., L. M. Russell, B. J. Turpin, R. J. Porcja, T. L. Campos, R. J. Weber and B. J. Huebert (2003). "Source signatures of carbon monoxide and organic functional groups in Asian Pacific Regional Aerosol Characterization Experiment (ACE-Asia) submicron aerosol types." J. Geophys. Res. 108, doi: 10.1029/2003JD003703.
Gilardoni, S., L.M. Russell , A. Sorooshian, R.C. Flagan, J.H. Seinfeld, T.B. Bates, T. Onash, P.K. Quinn, J. Allan, D. Worsnop, B. Williams, A. Goldstein (2007), "Regional Variation of Oxygenated Functional Groups in Aerosol Particles on Four East Coast Sampling Platforms During ICARTT 2004," J. Geophys. Res., 12, doi: 10.101029/2006JD007737
Quinn, P.K., T.L. Miller, T.S. Bates, J.A. Ogren, E. Andrews, and G.E. Shaw (2002), “A 3-year record of simultaneously measured aerosol chemical and optical properties at Barrow, Alaska,” J. Geophys. Res. 107 (D11), doi: 10.1029/2001JD001248
Takahama, S., S. Gilardoni, L.M. Russell , and A.L.D, Kilcoyne (2007),“Classification of Multiple Types of Organic Carbon Composition in Atmospheric Particles by Scanning Transmission X-Ray Microscopy Analysis," Atmos. Environ. 41, 9435-9451.
Takahama, S., S. Gilardoni, and L.M. Russell (2008),"Single-Particle Oxidation-State and Morphology of Atmospheric Iron Aerosols," J. Geophys. Res., in press; preprint available at http://aerosols.ucsd.edu.