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| Titel |
Development of a High Precision and Stability Ambient N2O and CO Analyzer |
| VerfasserIn |
Jingang Zhou, John Hoffnagle, Sze Tan, Feng Dong, Derek Fleck, John Yiu, Kuan Huang, Graham Leggett, Yonggang He |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250130405
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| Publikation (Nr.) |
 EGU/EGU2016-10659.pdf |
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| Zusammenfassung |
| With a global warming potential of nearly 300, N2O is a critically important greenhouse gas,
contributing about 5 % of the US total GHG emissions. Agriculture soil management
practices are the dominant source of anthropogenic N2O emissions, contributing nearly 75 %
of US N2O emissions. In urban areas, vehicle tailpipe emissions and waste water treatment
plants are significant sources of N2O.
We report here a new mid-infrared laser-based cavity ring-down spectrometer (Picarro
G5310) that was recently developed to simultaneously measure sub-ppb ambient
concentrations of two key greenhouse gas species, N2O and CO, while measuring H2O as
well. It combines a quantum cascade laser with a proprietary 3-mirror optical cavity. The
ambient N2O and CO measurement precisions are 0.1ppb (10sec), 0.014ppb (600sec), and
0.006ppb (3000sec); and the measurements could even be averaged down over 3
hours, giving measurement precisions of 0.003ppb. The measurable N2O and CO
ranges have been tested up to 2.5ppm. With the high precision and unparalleled
stability, G5310 is believed a promising tool for long-term monitoring in atmospheric
sciences.
The new optical analyzer was set up to monitor N2O and CO (G5310), along with CO2
and CH4(G4301), in ambient air obtained from a 10 meter tower in Santa Clara, California.
Evidence of contributions from traffic and a nearby sewage treatment facility were expected
in the measurement data. |
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