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Fine Particle Composition Measured During ICARTT, Exams of Inorganic Chemistry

Brown University Inorganic Chemistry

Georgia Institute of Technology School of Earth and Atmospheric Sciences. Roadmap. A. Measurement overview. Statistics, altitude profile, charge balance.

Typology: Exams

2022/2023

Uploaded on 05/11/2023

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The School of Earth and

Atmospheric Sciences

Fine Particle Composition

Measured During ICARTT _ An

Overview Of Inorganic Ions And

Water Soluble Organic Carbon

Rick Peltier

Amy Sullivan

Chris Hennigan

Rodney Weber

Charles A. Brock

Joost de Gouw

John Holloway

Additional Acknowledgements:

Ann Middlebrook, Brendan Matthews, Adam Wollny, Carsten Warneke,

Donna Sueper, and the rest of the NOAA AL team.

Support: NOAA

Partial preview of the text

Download Fine Particle Composition Measured During ICARTT and more Exams Inorganic Chemistry in PDF only on Docsity!

The School of Earth and

Atmospheric Sciences

Fine Particle Composition

Measured During ICARTT _ An

Overview Of Inorganic Ions And

Water Soluble Organic Carbon

Rick Peltier

Amy Sullivan

Chris Hennigan

Rodney Weber

Charles A. Brock

Joost de Gouw

John Holloway

Additional Acknowledgements:

Ann Middlebrook, Brendan Matthews, Adam Wollny, Carsten Warneke,

Donna Sueper, and the rest of the NOAA AL team.

Support: NOAA

Roadmap

A. Measurement overview

Statistics, altitude profile, charge balance

B. Case Study 1: Aerosol source variability

C. Case Study 2: Urban aerosols that are

subjected to power plant influence.

D. Summary

Observed Plume Types

l Relatively pure biomass

– High WSOC and

Acetonitrile concs.

– Well-correlated WSOC &

Acetonitrile

– Little sulfate

l Mixed Biomass/Regional

(Flt 040722)

– High WSOC, acetonitrile,

sulfate.

l Urban/Regional

– High sulfate, lower WSOC

(~<4 mgC m

WSOC (

m

gC m

Acetonitrile (pptv)

Biomass

Slope: 0.

R

Mixed Plume

Urban/Regional

Biomass (smoke)

Observation Overview

l Sulfate, WSOC, Ammonium often

observed. Occasional nitrate (usually

biomass).

l Sulfate well correlated with volume in

urban/regional and mixed plumes,

while WSOC correlated with volume in

all plumes (strongest in biomass)

l Significant variability in aerosol

concentrations.

WSOC (

m^ gC m

Fine Volume ( mm^3 cm -3) Biomass Slope: 0.184 ± 0. Int: 0.236 ± 0. R^2 = 0. Mixed Slope: 0.103 ± 0. Int: 3.544 ± 0. R^2 = 0. Urban/Regional Slope: 0.092 ± 0. Int: 0.726 ± 0. R^2 = 0. 30 25 20 15 10 5 0 Sulfate ( m^ g m

Fine Volume ( mm^3 cm-3) Mixed Slope: 0.371 ± 0. Int: -5.457 ± 0. R^2 = 0. Urban/Regional Slope: 0.411 ± 0. Int: -0.522 ± 0. R^2 = 0. Biomass Slope: -0.008 ± 0. Int: 2.220 ± 1. R^2 = 0.

Additional Analysis of Altitude Profile l Species/fine volume median of 500m bins. l Little change in fraction for sulfate and biomass- derived WSOC. l Increase in WSOC/fine volume fraction with altitude.

Altitude (meters - bin centroid)

(Species/Fine Particle Volume)

Sulfate

Biomass WSOC

Urban/Regional WSOC

Charge Balance Along Altitude l Measured aerosol ionic components generally in charge balance (especially at high alt) l Many events where net charge is negative – driven by sulfate, and most frequently at low alt. (i.e. excess sulfate not balanced by ammonium) l Transient events of positive net charge during biomass events – suggest unmeasured organic acid as anion pair (to NH 4

?). 6000 5000 4000 3000 2000 1000 0 Altitude (m) -0.3 -0.2 -0.1 0.0 0. Net Charge (meq m

)

Sulfate/Fine Particle Volume^ Biomass Mixed Urban/Regional Biomass

Case Study 2: Flight 040815 Plumes over Atlanta, GA.

Latitude -85.5 -85.0 -84.5 -84.0 -83.5 -83. Longitude Georgia Alabama 80100120140160180 CO (ppbv) — Wind Direction and Speed SO 2 Source (scaled by '99 emissions)

X

B A

C

D E 5 4 3 2 1 WSOC (μgC m

) 18: 8/15/ 18:30 19:00 19:30 20: UTC 200 180 160 140 120 100 80 CO (ppbv) 50 40 30 20 10 0 Fine Volume (μm3 cm
) 5 4 3 2 1 0 Altitude (km) 30 25 20 15 10 5 0 SO (^2) (ppbv) 15 10 5 0 Sulfate (μg m
) A B C D E X Molar Ratio 1.56 1.21 2.12 1. (ammonium/sulfate) 1 2 3 3-sec WSOC (^) WSOC-CO: R^2 = 0. SO 2 and SO 4 = spikes from local power plants

Case Study 2: Flight 040815 Plumes over Atlanta, GA. 5 4 3 2 1 WSOC (μgC m

) 18: 8/15/ 18:30 19:00 19:30 20: UTC 200 180 160 140 120 100 80 CO (ppbv) 50 40 30 20 10 0 Fine Volume (μm3 cm
) 5 4 3 2 1 0 Altitude (km) 30 25 20 15 10 5 0 SO (^2) (ppbv) 15 10 5 0 Sulfate (μg m
) A B C D E X Molar Ratio 1.56 1.21 2.12 1. (ammonium/sulfate) 1 2 3 Little WSOC enhancement in Power Plant Plumes

Latitude -85.5 -85.0 -84.5 -84.0 -83.5 -83. Longitude Georgia Alabama 80100120140160180 CO (ppbv) — Wind Direction and Speed SO 2 Source (scaled by '99 emissions)

Fine Particle Composition Measured During ICARTT, Exams of Inorganic Chemistry

Related documents

Partial preview of the text

Download Fine Particle Composition Measured During ICARTT and more Exams Inorganic Chemistry in PDF only on Docsity!

The School of Earth and

Atmospheric Sciences

Fine Particle Composition

Measured During ICARTT _ An

Overview Of Inorganic Ions And

Water Soluble Organic Carbon

Rick Peltier

Amy Sullivan

Chris Hennigan

Rodney Weber

Charles A. Brock

Joost de Gouw

John Holloway

Additional Acknowledgements:

Ann Middlebrook, Brendan Matthews, Adam Wollny, Carsten Warneke,

Donna Sueper, and the rest of the NOAA AL team.

Support: NOAA

Roadmap

A. Measurement overview

Statistics, altitude profile, charge balance

B. Case Study 1: Aerosol source variability

C. Case Study 2: Urban aerosols that are

subjected to power plant influence.

D. Summary

Observed Plume Types

l Relatively pure biomass

– High WSOC and

Acetonitrile concs.

– Well-correlated WSOC &

Acetonitrile

– Little sulfate

l Mixed Biomass/Regional

(Flt 040722)

– High WSOC, acetonitrile,

sulfate.

l Urban/Regional

– High sulfate, lower WSOC

(~<4 mgC m

WSOC (

m

gC m

Acetonitrile (pptv)

Biomass

Slope: 0.

R

Mixed Plume

Urban/Regional

Biomass (smoke)

Observation Overview

l Sulfate, WSOC, Ammonium often

observed. Occasional nitrate (usually

biomass).

l Sulfate well correlated with volume in

urban/regional and mixed plumes,

while WSOC correlated with volume in

all plumes (strongest in biomass)

l Significant variability in aerosol

concentrations.

WSOC (

Altitude (meters - bin centroid)

(Species/Fine Particle Volume)

Sulfate

Biomass WSOC

Urban/Regional WSOC

X

B A

C

X

B A

C

D

E

Summary (2/2)

l Case Study 1: example of aerosol source

variability.

– Higher [sulfate/fine volume] in power generation