characterization of urban particulate air pollution over
TRANSCRIPT
Characterization of Urban Particulate Air Pollution over
Metropolitan Newark in New Jersey
on the US East Coast
Yuan Gao, Lily Xia, Dawn Roberts-Semple, Rafael Jusino-Astresino, Chris Thuman,
Lu Wang, Nathi Kijpatanasilp
Department of Earth and Environmental Sciences
Rutgers University
Newark, New Jersey USA
.
Objectives:
• To characterize mass-size distributions of ambient aerosol
particles in the polluted urban environment
•To investigate the interactions of chemical species
•To explore the impact of air pollution on biogeochemistry
Methodology:
•Micro-Orifice Uniform Deposit Impactor (MOUDI)
•Inductively coupled plasma mass spectrometry (ICPMS)
•Scanning electron microscope (SEM)
•Ion chromatography (IC)
Newark
Air Measurement Sites
Atlantic ocean
Long Islan
d
New York City
0
10
20
30
40
0.01 0.1 1 10 100
Dp (µm)
dC
/dlo
g(d
Dp)
(µm
m-3
)3)
7/13-7/14
7/24-7/27
8/15-8/18
8/18-8/21
8/21-8/24
8/24-8/27
9/6-9/9
9/9-9/12
9/20-9/22
9/25-9/27
10/12-10/16
12/14-12/18
(Zhao and Gao, Atmospheric Environment, 2008)
Aerosol Mass Size Distributions: Unban Newark
2006
(Xia and Gao, Marine Chemistry, 2010)
Mass Size Distributions at Coastal Site
2009
Mass Size Distributions at High-Traffic Site
Size Distributions: Selected Trace
Elements
Vanadium
Nickle
Size Distributions: Water-Soluble Inorganic and Organic Species
Sulfate and oxalate:
- Dominant peaks are in
submicron meter size ranges
for both,
- positively correlated,
- Consistent with Yu et al,
(2005).
- Both can come from
pollution emissions.
- Both may play important
roles in dust geochemistry;
dust is a source of Fe, a
limiting nutrient in open
ocea.
Evidence of interactions of
soil particles with acific air
pollutants.
(Gao and Anderson,
JGR-Atmospheres, 2001)
Hematite Dissolution in Oxalate Solutions
Dissolution Time (hours)
0 10 20 30 40 50 60
0
2
4
6
8
10
In 25µM oxalate
In background eletrolyte
)b
0 10 20 30 40 50 60
Dis
solv
ed iro
n a
mount
( µm
ol g-1
)
0
2
4
6
8
10Coated with 25mM oxalate
Non-coated )a
pH = 2.4 ± 0.1(Xu and Gao, Applied Geochemistry, 2008)
H+
Inner sphere
coordinated oxygen
Oxygen
C
Molecular structure of inner-sphere surface complexation of Fe(III)-oxalate
Hem
ati
te
So
luti
on
HO – C = O
HO – C = O
Fe
Fe
Implementation of the field/laboratory results from air
pollution studies into global models to gain better
understanding of biogeochemical cycles:
“Aeolian Iron Mobilization by Dust-Acids Interactions and
Its Implication for Soluble Iron Deposition to the Ocean: A
Test Involving Potential Anthropogenic Organic Acidic
Species”
(Luo and Gao, Environmental Chemistry, 2010)
Conclusions:
1. Ambient particulate mass in this region is
dominated by submicron meter particles, likely
formed through heterogeneous reactions,
2. Particulate matter is highly enriched with
chemical elements of non-crustal source,
indicating the level of air pollution,
3. Acidic air pollutants may interact with dust and
then iron, affecting global biogeochemical cycles.
Thank You.Thank You.Thank You.Thank You.