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

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

Measurements: Fourier Transform InfraredSpectrophotometer (FTIR)

Wollongong is a member of theMeasurement Networks:

Atmospheric trace gases absorb solarradiation in the infrared

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.

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

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

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

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

Acknowledgements

Centre for Atmospheric Chemistry, University of Wollongong

National Computing Infrastructure - Canberra

University of Harvard - Travel Funding

Tropospheric Pollution: Some Chemistry

Tropospheric Hydrocarbon-OX -NOX Main Pathways

Models

www.gfdl.noaa.gov/earth-system-model

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