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A 60-year record of atmospheric carbon monoxide reconstructed from Greenland firn air: SUPPLEMENTARY MATERIAL 2. Sampling and Analytical Methods We provide some further detail here on NOAA [CO] and [H2] analyses, since up-to-date descriptions are not available elsewhere. [CO] was measured on a syste...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.423.2415 http://www.atmos-chem-phys.net/13/7567/2013/acp-13-7567-2013-supplement.pdf |
| Summary: | A 60-year record of atmospheric carbon monoxide reconstructed from Greenland firn air: SUPPLEMENTARY MATERIAL 2. Sampling and Analytical Methods We provide some further detail here on NOAA [CO] and [H2] analyses, since up-to-date descriptions are not available elsewhere. [CO] was measured on a system designed to analyze a suite of trace gases in the same air sample. Sample flasks were first attached to an eight port sampling manifold fitted with all stainless steel components. The dead volume between flasks and a down-line transfer pump was then evacuated to < 0.13 mbar. A stream selection valve determines which flask is opened to the system and a transfer pump with a MFC regulates flow rates. Samples are cryogenically dried to-80 C before a second stream selection valve partitions air flow to the CO analyzer and three other instruments. Sample flow rates, stream selection valves and instrument functions are controlled by HP computer and custom software |
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