Chris W. Rella
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View article: Advancements in the Detection and Monitoring of VOCs
Advancements in the Detection and Monitoring of VOCs Open
In recent years, there has been increasing interest in monitoring Volatile Organic Compounds (VOCs) in the ambient atmosphere. VOCs in the atmosphere can lead to dangerous levels of ozone, impacting human health and degrading ecosystems. F…
View article: Spectroscopic quantification of extremely rare molecular species in the presence of interfering optical absorption
Spectroscopic quantification of extremely rare molecular species in the presence of interfering optical absorption Open
Optical spectrometer apparatus, systems, and methods for analysis of carbon-14 including a resonant optical cavity configured to accept a sample gas including carbon-14, an optical source configured to deliver optical radiation to the reso…
View article: Qualification of Radiocarbon Using Spectroscopic Means
Qualification of Radiocarbon Using Spectroscopic Means Open
The purpose of this Cooperative Research and Development Agreement (CRADA) between Picarro Inc. and the Lawrence Livermore National Security, LLC, as operator of the Lawrence Livermore National Laboratory (referred to individually as "LLNL…
View article: Novel, real-time measurements of VOCs using a Cavity Ring-Down Spectrometer (CRDS)
Novel, real-time measurements of VOCs using a Cavity Ring-Down Spectrometer (CRDS) Open
<p>Measurements of volatile organic compounds (VOCs) are important in a wide variety of scientific disciplines, including air quality, biogeochemistry, hydrology, plant and animal physiology, human health, and petrochemistry. General…
View article: High-precision atmospheric oxygen measurement comparisons between a newly built CRDS analyzer and existing measurement techniques
High-precision atmospheric oxygen measurement comparisons between a newly built CRDS analyzer and existing measurement techniques Open
Carbon dioxide and oxygen are tightly coupled in land biosphere CO2–O2 exchange processes, whereas they are not coupled in oceanic exchange. For this reason, atmospheric oxygen measurements can be used to constrain the global carbon cycle,…
View article: Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor
Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor Open
Measurements of dry air mole fractions of atmospheric greenhouse gases are used in inverse models of atmospheric tracer transport to quantify their sources and sinks. The measurements have to be calibrated to a common scale to avoid bias i…
View article: High-precision atmospheric oxygen measurement comparisons between a newly built CRDS analyzer and existing measurement techniques
High-precision atmospheric oxygen measurement comparisons between a newly built CRDS analyzer and existing measurement techniques Open
Carbon dioxide and oxygen are tightly coupled in land–biospheres CO2–O2 exchange processes, while they are not coupled in oceanic exchange. For this reason, atmospheric oxygen measurements can be used to constrain the global carbon cycle, …
View article: Evaluation of the IAGOS-Core GHG package H <sub>2</sub> O measurements during the DENCHAR airborne inter-comparison campaign in 2011
Evaluation of the IAGOS-Core GHG package H <sub>2</sub> O measurements during the DENCHAR airborne inter-comparison campaign in 2011 Open
As part of the DENCHAR (Development and Evaluation of Novel Compact Hygrometer for Airborne Research) inter-comparison campaign in northern Germany in 2011, a commercial cavity ring-down spectroscopy (CRDS) based gas analyzer (G2401-m, Pic…
View article: Supplementary material to "Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor"
Supplementary material to "Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor" Open
S1 Uncertainties of external cavity pressure measurements in experiments with stable water vapor levelsIn this section, we present possible random and systematic uncertainties of the external cavity pressure measurements, look for their si…
View article: Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor
Correcting atmospheric CO <sub>2</sub> and CH <sub>4</sub> mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor Open
Measurements of dry air mole fractions of atmospheric greenhouse gases are used in inverse models of atmospheric tracer transport to quantify their sources and sinks. The measurements have to be calibrated to a common scale to avoid bias i…
View article: Evaluation of the IAGOS-Core GHG Package H <sub>2</sub> O measurementsduring the DENCHAR airborne inter-comparison campaign in 2011
Evaluation of the IAGOS-Core GHG Package H <sub>2</sub> O measurementsduring the DENCHAR airborne inter-comparison campaign in 2011 Open
As part of the DENCHAR (Development and Evaluation of Novel Compact Hygrometer for Airborne Research) inter-comparison campaign in North-Germany in 2011, a commercial cavity ring-down spectroscopy (CRDS) based gas analyzer (G2401-m, Picarr…
View article: Qualification of Radiocarbon Using Spectroscopic Means Final Report CRADA No. TC02170.0
Qualification of Radiocarbon Using Spectroscopic Means Final Report CRADA No. TC02170.0 Open
The purpose of this Cooperative Research and Development Agreement (CRADA) between Picarro Inc. and Lawrence Livermore National Security, LLC, as operator of the Lawrence Livermore National Laboratory (referred to individually as "LLNL") i…
View article: Effects of variation in background mixing ratios of N <sub>2</sub> , O <sub>2</sub> , and Ar on the measurement of <i>δ</i> <sup>18</sup> O–H <sub>2</sub> O and <i>δ</i> <sup>2</sup> H–H <sub>2</sub> O values by cavity ring-down spectroscopy
Effects of variation in background mixing ratios of N <sub>2</sub> , O <sub>2</sub> , and Ar on the measurement of <i>δ</i> <sup>18</sup> O–H <sub>2</sub> O and <i>δ</i> <sup>2</sup> H–H <sub>2</sub> O values by cavity ring-down spectroscopy Open
Cavity ring-down spectrometers have generally been designed to operate under conditions in which the background gas has a constant composition. However, there are a number of observational and experimental situations of interest in which t…
View article: An improved water correction function for Picarro greenhouse gas analyzers
An improved water correction function for Picarro greenhouse gas analyzers Open
Measurements of dry air mole fractions of atmospheric greenhouse gases are widely used in inverse models of atmospheric tracer transport to quantify the sources and sinks of the gases. The measurements have to be calibrated to a common sca…
View article: Effects of variation in background mixing ratios of N <sub>2</sub> , O <sub>2</sub> , and Ar on the measurement of δ <sup>18</sup> O-H <sub>2</sub> O and δ <sup>2</sup> H-H <sub>2</sub> O values by cavity ring-down spectroscopy
Effects of variation in background mixing ratios of N <sub>2</sub> , O <sub>2</sub> , and Ar on the measurement of δ <sup>18</sup> O-H <sub>2</sub> O and δ <sup>2</sup> H-H <sub>2</sub> O values by cavity ring-down spectroscopy Open
Cavity ring-down spectrometers have generally been designed to operate under conditions in which the background gas has a constant composition. However, there are a number of observational and experimental situations of interest in which t…
View article: Evaluation of laser‐based spectrometers for greenhouse gas flux measurements in coastal marshes
Evaluation of laser‐based spectrometers for greenhouse gas flux measurements in coastal marshes Open
Precise and rapid analyses of greenhouse gases (GHGs) will advance understanding of the net climatic forcing of coastal marsh ecosystems. We examined the ability of a cavity ring down spectroscopy (CRDS) analyzer (Model G2508, Picarro) to …