australasian total column co and h2co investigated with...
TRANSCRIPT
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Australasian total column CO and H2COinvestigated with GEOS-Chem,
FTIR measurements,and an Earth-System Model (ACCESS)
Rebecca Buchholz,Dr. Clare Paton-Walsh, Dr. Peter Hurley,
Prof. David Griffith, Dr. Nicholas Jones
May 7, 2013
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An Australasian Perspective
GEOS-ChemACCESS (Australian Community Climate and Earth-System Simulator)and total column measurements:Wollongong (34.4 S, 150.9 E)Darwin (12.4 S, 130.9 E) andLauder (45.0 S, 169.7 E).
I CO, HCHO
I annual cycles
I model validity
CAC, googlemaps
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Measurements: Fourier Transform InfraredSpectrophotometer (FTIR)
Wollongong is a member of theMeasurement Networks:
Atmospheric trace gases absorb solarradiation in the infrared
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Models GEOS-Chem (CTM) ACCESS (ESM)(v8-03-01) (UKCA v7.3)†
http://www.geos-chem.org http://www.accessimulator.org.au
Resolution 2.0◦x 2.5◦ 1.25◦ x 1.875◦
47 levels (∼80 km) 38 levels (∼35 km)
Years Run 2004 – 2009 1980 – 2000 (1996-2000)
Meteorology NASA GEOS5 reanalysis prod-uct
Simulated, driven by SST
Emissions Inventories, scaled yearly Climatological mode:(Anth: EDGAR, BB: GFED2,BF:Yevich & Logan, 2003,Biogenic: MEGAN2.1)
year 2000 (IPCC AR4)
Chemistry fullchem: 80 chemical species standard: 46 species150 reactions (excluding isoprene)
† Zeng, G. and Pyle, J., GRL, 30(7), 1392, 2003.
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CO Annual Cycles
5e+17
1e+18
1.5e+18
2e+18
2.5e+18
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
CO
(m
ole
cule
s/c
m2)
Month
Wollongong
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 1996-2000FTIR 2004-2009
5e+17
1e+18
1.5e+18
2e+18
2.5e+18
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
CO
(m
ole
cule
s/c
m2)
Month
Darwin
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 2005-2009
5e+17
1e+18
1.5e+18
2e+18
2.5e+18
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
CO
(m
ole
cule
s/c
m2)
Month
Lauder
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 1996-2000FTIR 2004-2009
I GEOS-Chem CO is biasedhigh at Lauder
I ACCESS CO peaks onemonth early
I ACCESS CO is biased low tomeasurements
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HCHO Annual Cycles
0
5e+15
1e+16
1.5e+16
2e+16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
H2C
O (
mole
cule
s/c
m2)
Month
Wollongong
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 1996-2000FTIR 2004-2009
0
5e+15
1e+16
1.5e+16
2e+16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
H2C
O (
mole
cule
s/c
m2)
Month
Darwin
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 2006-2008
0
2e+15
4e+15
6e+15
8e+15
1e+16
1.2e+16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
H2C
O (
mole
cule
s/c
m2)
Month
Lauder
ACCESS 1996-2000GEOS-Chem 2004-2009
FTIR 1996-2000FTIR 2003-2005
I GEOS-Chem HCHO is biasedlow during Lauder Summer
I ACCESS HCHO is biased lowto measurements
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Isoprene Sensitivity
0
5e+15
1e+16
1.5e+16
2e+16
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
H2C
O (
mo
lecu
les/c
m2)
Month
Wollongong
ACCESS 1996-2000GEOS-Chem no isoprene 2009
GEOS-Chem half isoprene 2009GEOS-Chem 2004-2009
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Summary/Further Investigation
Table: Summary of comparison of models with measurements.
Trace Gas GEOS-Chem ACCESS
CO correct magnitudehigh at Lauder
offset low to measurements
correct annual cycle annual cycle peaks early
HCHO correct magnitudelow for Lauder in Summer
offset low to measurements
ACCESS recommendations:
I correct CO emission seasonality
I address low VOC emissions
I include isoprene and related chemistry
I save OH fields
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Acknowledgements
Centre for Atmospheric Chemistry, University of Wollongong
National Computing Infrastructure - Canberra
University of Harvard - Travel Funding
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Tropospheric Pollution: Some Chemistry
Tropospheric Hydrocarbon-OX -NOX Main Pathways
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Models
www.gfdl.noaa.gov/earth-system-model
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Australasia - Climate Zones
Australia in a warmer climate in Australia†:decrease: rainfall, number of cyclonesincrease in extremes: rainfall, drought, fire risk, cyclone severity
† Climate Change in Australia - Technical report 2007, CSIRO
Background