SLIDE 1
Baring Head: 41.41°S, 174.87°W
Rainbow Mountain Arrival Heights
Lauder
Baring Head Raoul Island
Carbon Monoxide Concentration and Isotope Measurements in New - - PowerPoint PPT Presentation
Carbon Monoxide Concentration and Isotope Measurements in New - - PowerPoint PPT Presentation
Carbon Monoxide Concentration and Isotope Measurements in New Zealand. Rowena Moss, Gordon Brailsford, Martin Manning and Hinrich Schaefer. National Institute of Water and Atmospheric Research. Raoul Island Baring Head: 41.41S, 174.87W
SLIDE 2
SLIDE 3
GC-CVAFS
1 2 3 4 5 6 7 8 9 10
Heated HgO Bed Detector Vent 1mL sample loop Argon carrier Purge O vent
2
Main column In Out Pre-column
CVAFS GC
Rotometer
SLIDE 4
- Seasonal maximum
in September (austral spring)
- Seasonal minimum
in February (austral summer)
- Seasonal Amplitude
decrease from 40ppb to 30ppb
SLIDE 5
CO CO2
SLIDE 6
CO sources- isotope signatures
ch4 oxidation Technological Forest burning Savanna burning Isoprene Terpene NMHC Ocean
- 35
- 25
- 15
- 5
5 15 25 35
- 55
- 45
- 35
- 25
- 15
- 5
5 15 d13C d18O
SLIDE 7
- Seasonal maximum
in March
- Seasonal minimum
in late November
- Seasonal Amplitude
decrease from 6‰ to 4.5 ‰
SLIDE 8
- Seasonal maximum
in March
- Seasonal minimum
in September
- Seasonal Amplitude
decrease from 8‰ to 5 ‰
SLIDE 9
- Seasonal maximum
in September
- Seasonal minimum
in March
SLIDE 10
Summary
- Observed decrease in CO concentrations in
the Southern Hemisphere
- Changes in sources such as savanna and forest
burning and CH4 oxidation can be observed in δ13CO
- 14CO can be used to infer variations in OH
SLIDE 11
NIWA TROPAC team
Mike Harvey Zoë Buxton Gordon Brailsford Peter Sperlich Sara Mikaloff- Fletcher Rowena Moss Andrew Marriner Sylvia Nichol John McGreggor Hinrich Schaeffer Tony Bromley Kay Steinkamp Ross Martin