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| Titel |
Cavity Ring-Down Spectroscopy Lite: A Low Power Analyzer for measuring
Carbon Dioxide, Methane and Water Vapor |
| VerfasserIn |
Derek Fleck, John Hoffnagle, Sze Tan, 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 |
250130489
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| Publikation (Nr.) |
 EGU/EGU2016-10751.pdf |
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| Zusammenfassung |
| Greenhouse gas accumulation has contributed to the changes in environments across the
globe. Monitoring these fluctuations on global and local scales will allow scientists to better
understand contributions that are made from nature and humans. This has led to the
deployment of analytical instrumentation of all types to the most remote areas as well as the
most densely populated areas. This however requires instruments to be precise, versatile,
robust, and most importantly have power requirements that are as not limited by
location, i.e. low enough power consumption to run off of batteries or even solar
array.
Here we present a full greenhouse gas analyzer that utilizes a new method of CRDS to
measure carbon dioxide, methane and water vapor that consumes only 25W and still
maintains long term stability to allow for averaging time of over 3 hours. Measurements
have a 1-σ precision of 30 ppb for CO2 and 300 ppt of CH4 with 5 minutes of
averaging; and with measurements of 3 hour averages reaching precisions down to
40ppt of methane. Additionally this new flavor of CRDS has allowed for an overall
increase in measurement dynamic range from traditional CW-CRDS measuring
methane up to 1000ppm and carbon dioxide up to several percent. We will present
supplemental data acquired using this <11 kg analyzer, including soil respirations
using closed static chambers and 10m tower measurements from Santa Clara, CA. |
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