black carbon measurements at the cape grim baseline air pollution station, tasmania · black carbon...
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Black Carbon Measurements at the Cape Grim Baseline Air Pollution Station, Tasmania
OCEANS & ATMOSPHERE
Fabienne Reisen*, John Gras, Jason Ward, Melita Keywood Global Monitoring Annual Conference, Boulder CO 23 May 2017
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Cape Grim Baseline Air Pollution Station Black carbon measurements
Black carbon measurements at Cape Grim| Fabienne Reisen 2 |
Year Instrument
1990-2007 Aethalometer- Magee Scientific AE10
2007 Thermo MAAP 5012 (670nm)
Sep 2015 Photoacoustic Extinctiometer DMT PAX – 870nm
June 2016 Tricolor Absorption Photometer (TAP-NOAA/Brechtel)
10m mast via 18 mm diameter outlet
RH controlled heater (RH < 40%) BGI 1 μm VSCC
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Initial climatology of BC (1990-1997)
Black carbon measurements at Cape Grim| Fabienne Reisen 3 |
• Main contributors to BC: Northern TAS and Melbourne/eastern VIC (peak BC autumn/winter)
• Baseline conditions: peak BC in spring attributed to long-range transport of smoke
• Baseline sector: potentially wind-related artefacts due to scattering or re-suspended soil
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Origins of air masses at Cape Grim
Black carbon measurements at Cape Grim| Fabienne Reisen 4 |
Baseline sector
Continental Australian
sector
Tasmanian sector
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What are the sources of BC at Cape Grim?
Black carbon measurements at Cape Grim| Fabienne Reisen 5 |
continental sector
Long-range transport of smoke
Tasmanian sector
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Black carbon concentrations 2011-2017
Black carbon measurements at Cape Grim | Fabienne Reisen 6 |
Baseline Air
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Daily median BC – highlighting few large events
Black carbon measurements at Cape Grim | Fabienne Reisen 7 |
0
2011 2013 2012 2014 2015 2017 2016
1000
2000
3000
eBC
(ng
m-3
)
20-21 May 7 April 22 March
Jan/Feb 2016
7 April
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Tasmanian Fires 2016
Black carbon measurements at Cape Grim | Fabienne Reisen 8 |
At least 70 separate fires that spread quickly burning an area of ~ 100,000 ha over a 6-week period. This was one of the largest and most ecologically damaging fires to occur in Tasmania in recent history.
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Tasmanian Fires 2016
Black carbon measurements at Cape Grim | Fabienne Reisen 9 |
12 Feb 2016
25 Jan 2016
EFBC=0.3 g/kg fuel
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Potential sources of high BC
Black carbon measurements at Cape Grim | Fabienne Reisen 10 |
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High BC pollution events from continental sector
Black carbon measurements at Cape Grim | Fabienne Reisen 11 |
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High BC pollution events from continental sector
Black carbon measurements at Cape Grim | Fabienne Reisen 12 |
A A
B
B
C
C
D
D
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High BC levels from Tasmanian sector
Black carbon measurements at Cape Grim | Fabienne Reisen 13 |
April 2016
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Seasonal cycles for baseline sector
Black carbon measurements at Cape Grim | Fabienne Reisen 14 |
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Seasonal cycles for baseline sector
Black carbon measurements at Cape Grim | Fabienne Reisen 15 |
Additional criteria for baseline conditions: Radon < 100 mBq m-3
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Seasonal BC concentrations
Black carbon measurements at Cape Grim | Fabienne Reisen 16 |
• Autumn peak for continental sector – increased biomass burning from prescribed burns & woodheaters
• Winter peak for Tasmanian sector – domestic woodsmoke
• Slight spring peak for baseline sector
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Future work
• Extend analysis of BC measurements to years prior 2011 • Investigate long-term trend in BC concentrations at Cape Grim • Evaluate the TAP and PAX
Black carbon measurements at Cape Grim | Fabienne Reisen 17 |
0 0.4 0.8 1.2 1.6 2MAAP eBC (µg m-3)
0
2
4
6
8
10
12
14
TAP
Abs
orpt
ion
coef
ficie
nt
Y = 2.60 * X + 0.081 (r2 = 0.994)
Y = 4.05 * X + 0.071r2 = 0.987
Y = 5.26 * X + 0.058r2 = 0.976
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Oceans and Atmosphere Fabienne Reisen Senior Research Scientist t +61 3 9239 4435 e [email protected]
OCEANS AND ATMOSPHERE
Thank you