10.1021/es4040045.s001
Celia
L. Faiola
Celia
L.
Faiola
Graham S. VanderSchelden
Graham S.
VanderSchelden
Miao Wen
Miao
Wen
Farah C. Elloy
Farah C.
Elloy
Douglas R. Cobos
Douglas R.
Cobos
Richard J. Watts
Richard J.
Watts
B. Thomas Jobson
B. Thomas
Jobson
Timothy M. VanReken
Timothy M.
VanReken
SOA Formation
Potential of Emissions from Soil and
Leaf Litter
American Chemical Society
2014
litter monoterpene emission rates
litter monoterpene emissions
biogenic emissions season
drive SOA formation
canopy emissions
leaf litter
VOC
leaf litter samples
ponderosa pine emissions
2014-01-21 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/SOA_Formation_Potential_of_Emissions_from_Soil_and_Leaf_Litter/2330476
Soil
and leaf litter are significant global sources of small oxidized
volatile organic compounds, VOCs (e.g., methanol and acetaldehyde).
They may also be significant sources of larger VOCs that could act
as precursors to secondary organic aerosol (SOA) formation. To investigate
this, soil and leaf litter samples were collected from the University
of Idaho Experimental Forest and transported to the laboratory. There,
the VOC emissions were characterized and used to drive SOA formation
via dark, ozone-initiated reactions. Monoterpenes dominated the emission
profile with emission rates as high as 228 μg-C m<sup>–2</sup> h<sup>–1</sup>. The composition of the SOA produced was similar
to biogenic SOA formed from oxidation of ponderosa pine emissions
and α-pinene. Measured soil and litter monoterpene emission
rates were compared with modeled canopy emissions. Results suggest
surface soil and litter monoterpene emissions could range from 12
to 136% of canopy emissions in spring and fall. Thus, emissions from
leaf litter may potentially extend the biogenic emissions season,
contributing to significant organic aerosol formation in the spring
and fall when reduced solar radiation and temperatures reduce emissions
from living vegetation.