Chemical speciation of sulfur in marine cloud droplets and particles: Analysis of individual particles from the marine boundary layer over the California current

Rebecca J Hopkins; Yury Desyaterik; Alexei V Tivanski; Rahul A Zaveri; Carl M Berkowitz; Tolek Tyliszczak; Mary K Gilles; Alexander Laskin

doi:10.1029/2007JD008954

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Chemical speciation of sulfur in marine cloud droplets and particles: Analysis of individual particles from the marine boundary layer over the California current

Journal article

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Chemical speciation of sulfur in marine cloud droplets and particles: Analysis of individual particles from the marine boundary layer over the California current

Rebecca J Hopkins, Yury Desyaterik, Alexei V Tivanski, Rahul A Zaveri, Carl M Berkowitz, Tolek Tyliszczak, Mary K Gilles and Alexander Laskin

Journal of Geophysical Research Atmospheres, Vol.113(D4), D04209

03/12/2008

DOI: 10.1029/2007JD008954

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Abstract

Detailed chemical speciation of the dry residue particles from individual cloud droplets and interstitial aerosol collected during the Marine Stratus Experiment (MASE) was performed using a combination of complementary microanalysis techniques. Techniques include computer controlled scanning electron microscopy with energy dispersed analysis of X-rays (CCSEM/EDX), time-of-flight secondary ionization mass spectrometry (TOF-SIMS), and scanning transmission X-ray microscopy with near edge X-ray absorption fine structure spectroscopy (STXM/NEXAFS). Samples were collected at the ground site located in Point Reyes National Seashore, approximately 1 km from the coast. This manuscript focuses on the analysis of individual particles sampled from air masses that originated over the open ocean and then passed through the area of the California current located along the northern California coast. Based on composition, morphology, and chemical bonding information, two externally mixed, distinct classes of sulfur containing particles were identified: chemically modified (aged) sea salt particles and secondary formed sulfate particles. The results indicate substantial heterogeneous replacement of chloride by methanesulfonate (CH3SO3-) and non-sea salt sulfate (nss-SO42-) in sea-salt particles with characteristic ratios of nss-S/Na>0.10 and CH3SO3-/nss-SO42->0.6.

Absorption

Boundary Layers

Microscopy

Morphology

Spectroscopy

Aerosol, marine boundary layer, methane sulfonate, sulfur partitioning

AEROSOLS

BONDING

CHLORIDES

COMPUTERS

FINE STRUCTURE

INTERSTITIALS

IONIZATION

MASS SPECTROSCOPY

MICROANALYSIS

RESIDUES

SCANNING ELECTRON MICROSCOPY

SEAS

SULFATES

SULFUR

Details

Title: Subtitle: Chemical speciation of sulfur in marine cloud droplets and particles: Analysis of individual particles from the marine boundary layer over the California current
Creators: Rebecca J Hopkins
Yury Desyaterik
Alexei V Tivanski
Rahul A Zaveri
Carl M Berkowitz
Tolek Tyliszczak
Mary K Gilles
Alexander Laskin
Resource Type: Journal article
Publication Details: Journal of Geophysical Research Atmospheres, Vol.113(D4), D04209
DOI: 10.1029/2007JD008954
ISSN: 2169-897X
eISSN: 2169-8996
Language: English
Date published: 03/12/2008
Academic Unit: Chemistry
Record Identifier: 9984217430702771

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