fts measurements for constraining the australian carbon cycle
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FTS Measurements for Constraining the Australian Carbon Cycle. Nicholas Deutscher 1,2 , Rachel Law 1 , David Griffith 2 and Glenn Bryant 2. Outline:. My PhD Plan. 1 CSIRO Atmospheric Research, Aspendale, Victoria 3195 - PowerPoint PPT PresentationTRANSCRIPT
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FTS Measurements for Constraining the Australian Carbon Cycle
Nicholas Deutscher1,2, Rachel Law1, David Griffith2 and Glenn Bryant2
Outline: • My PhD Plan
1CSIRO Atmospheric Research, Aspendale, Victoria 31952Atmospheric Chemistry Research Group, Department of Chemistry, University of Wollongong, Wollongong, NSW, 2522
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My PhD Project
Aim: to better understand the Australian carbon cycle; and to provide constraints to estimates of Australian carbon
fluxes.
How? – Using: FTS atmospheric trace gas measurements; and Inverse atmospheric modelling
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Background – Why Australia?
Well…
Also:– Unique habitat and conditions– Few measurements
– Large Savanna biomass burning region Northern Territory/North Western Australia
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Existing atmospheric measurements
Cape Grim Baseline Air Pollution Station
– Continuous CO2, 13CO2
– CH4, CO, N2O Flux Towers
– Howard Springs– Cape Tribulation– Burdekin– Virginia Park– Janina– Tumbarumba– Maroondah
Solar FTIR remote sensing– Wollongong
In-situ FTIR– Aspendale– Field campaigns
Jenolan Caves Kyabram Tumbarumba
Cape Grim Baseline Air Pollution Station
– Continuous CO2, 13CO2
– CH4, CO, N2O
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Forthcoming…
Global– OCO Satellite
Other more localised measurements– In situ FTIR
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OCO Satellite Program Overview
– Orbiting Carbon Observatory– US-based (JPL-NASA)– Dedicated global CO2 mapping
– 3 parts1. Satellite measurements
2. Ground-based validation measurements
3. Inverse modelling
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OCO – Validation Measurements (1)
Network of ground-based sites– Arrival Heights, Antarctica 78° S upgrade– Lauder, New Zealand 45° S upgrade– Wollongong, Australia 34° S new– Darwin, Australia 12° S new– Mauna Loa 20° N upgrade– Southern Great Plains, OK 36° N upgrade– Harvard Forest 42° N new– Park Falls 46° N new– Bremen 53° N existing– Poker Flat 65° N upgrade– Ny Alesund 79° N existing
Continuous in situ CO2 measurements by instrument traceable to CMDL standard (e.g. Li-Cor infrared analyzer)
Ancillary measurements of cloud, aerosol, radiation, and standard meteorological variables
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OCO – Validation Measurements (2)
Major validation – ground-based solar FTS– Bruker 125HR (or equivalent)– Hi-resolution (0.02cm-1) FTNIR spectra (3500-15798cm-1)
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More localised measurements
In-situ FTIR (OOOFTI) Continuous data
– Including night time Multi-species - CO2, CH4, CO,
N2O, 13CO2
~0.1% (0.3ppmv) precision CO2
Co-located with OCO ground validation
– Darwin– Lauder (trial currently underway)
Ghan railway (Adelaide to Darwin) An OOOFTI in Kyabram
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My PhD Plan of action
1. Inverse modelling (1)• Planned measurements to determine their value
2. FTS Measurements
3. Inverse modelling (2)• Incorporate real measurements to determine source
estimates
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Modelling (1) – Test phase
– Forward atmospheric transport model (CCAM) Generate synthetic data representative of the planned measurement
strategy
– Time Dependent Inverse (TDI) model Test value of additional measurements in determining sources and
uncertainties when added to a standard existing network
– CO2 only (currently)
– Background site network CMDL/NOAA flask sites – monthly averaged Continuous Cape Grim synthetic data
– Additional sites (separately, combined) Darwin Alice Springs Ghan Railway
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Modelling Results
Uncertainty improvement - Darwin + basic network
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Uncertainty improvement - Ghan railway + basic network
Ghan Railway
Ghan railway Darwin
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Darwin & Ghan
Uncertainty improvement - Darwin AND Ghan Railway + basic network
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Where to now?
Further investigate measurement strategies– Frequency of Ghan measurements– Combinations of sites– Indian-Pacific railway
Multi-species inversions– Use CH4, CO data as well as CO2
Using column measurements Measurements
– Lauder– Darwin– Ghan railway
Model the measurements– Australian carbon cycle information