Verifying Three Types of Methane Fluxes from Soils by Testing the Performance of a Novel Mobile Photoacoustic Method versus a Well-Established Gas Chromatographic One

2006 ◽  
Vol 40 (20) ◽  
pp. 6425-6431 ◽  
Author(s):  
Hermann F. Jungkunst ◽  
Raimund Sauter ◽  
Andreas Link ◽  
Sabine Fiedler ◽  
Karl Stahr ◽  
...  
Keyword(s):  
Photoacoustic Method ◽  
Methane Fluxes

scholarly journals Correction to “Spatial and temporal dynamics in eddy covariance observations of methane fluxes at a tundra site in northeastern Siberia”

2012 ◽  
Vol 117 (G1) ◽  
Author(s):  
F. J. W. Parmentier ◽  
J. van Huissteden ◽  
M. K. van der Molen ◽  
G. Schaepman-Strub ◽  
S. A. Karsanaev ◽  
...  
Keyword(s):  
Eddy Covariance ◽  
Temporal Dynamics ◽  
Northeastern Siberia ◽  
Spatial And Temporal Dynamics ◽  
Methane Fluxes

Energy efficiency of near infrared cobalt luminscence in ZnSe:Co determined by a photoacoustic method

2012 ◽  
Vol 20 (1) ◽  
Author(s):  
Ł. Chrobak ◽  
M. Maliński ◽  
K. Strzałkowski ◽  
J. Zakrzewski
Keyword(s):  
Energy Efficiency ◽  
Frequency Dependence ◽  
Near Infrared ◽  
Transmission Spectra ◽  
Photoacoustic Method ◽  
Infrared Luminescence ◽  
Amplitude Characteristics

AbstractThe paper presents results of computations of the energy efficiency of the cobalt luminescence in ZnSe:Co determined by the photoacoustic method. The transmission spectra, photoacoustic experimental and theoretical spectra, and the frequency dependence on the photoacoustic amplitude characteristics are presented. From them, the energy efficiency of Co2+ the near infrared luminescence (3200 nm) was computed in the frame of new proposed photoacoustic model of computations of the luminescence energy efficiency.

In vivo Percutaneous Absorptiometry by a Laser Photoacoustic Method Using a Novel Open-Ended Cell Combined with Light Guide

1994 ◽  
Vol 66 (14) ◽  
pp. 2267-2271 ◽  
Author(s):  
Ryuichi. Takamoto ◽  
Shinya. Yamamoto ◽  
Ryujiro. Namba ◽  
Tasuku. Takamatsu ◽  
Masahiro. Matsuoka ◽  
...  
Keyword(s):  
Light Guide ◽  
Photoacoustic Method

scholarly journals Nitrous oxide and methane fluxes from cattle excrement on C3 pasture and C4-dominated shortgrass steppe

2016 ◽  
Vol 225 ◽  
pp. 104-115 ◽  
Author(s):  
Kristopher L. Nichols ◽  
Stephen J. Del Grosso ◽  
Justin D. Derner ◽  
Ronald F. Follett ◽  
Shawn L. Archibeque ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Shortgrass Steppe ◽  
Methane Fluxes

scholarly journals The growing season greenhouse gas balance of a continental tundra site in the Indigirka lowlands, NE Siberia

2007 ◽  
Vol 4 (6) ◽  
pp. 985-1003 ◽  
Author(s):  
M. K. van der Molen ◽  
J. van Huissteden ◽  
F. J. W. Parmentier ◽  
A. M. R. Petrescu ◽  
A. J. Dolman ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Soil Temperature ◽  
Greenhouse Gas ◽  
Growing Season ◽  
Light Limitation ◽  
Greenhouse Gas Balance ◽  
Area Index ◽  
North East ◽  
Methane Fluxes ◽  
Gas Balance

Abstract. Carbon dioxide and methane fluxes were measured at a tundra site near Chokurdakh, in the lowlands of the Indigirka river in north-east Siberia. This site is one of the few stations on Russian tundra and it is different from most other tundra flux stations in its continentality. A suite of methods was applied to determine the fluxes of NEE, GPP, Reco and methane, including eddy covariance, chambers and leaf cuvettes. Net carbon dioxide fluxes were high compared with other tundra sites, with NEE=−92 g C m−2 yr−1, which is composed of an Reco=+141 g C m−2 yr−1 and GPP=−232 g C m−2 yr−1. This large carbon dioxide sink may be explained by the continental climate, that is reflected in low winter soil temperatures (−14°C), reducing the respiration rates, and short, relatively warm summers, stimulating high photosynthesis rates. Interannual variability in GPP was dominated by the frequency of light limitation (Rg<200 W m−2), whereas Reco depends most directly on soil temperature and time in the growing season, which serves as a proxy of the combined effects of active layer depth, leaf area index, soil moisture and substrate availability. The methane flux, in units of global warming potential, was +28 g C-CO2e m−2 yr−1, so that the greenhouse gas balance was −64 g C-CO2e m−2 yr−1. Methane fluxes depended only slightly on soil temperature and were highly sensitive to hydrological conditions and vegetation composition.

scholarly journals Methylocella Species Are Facultatively Methanotrophic

2005 ◽  
Vol 187 (13) ◽  
pp. 4665-4670 ◽  
Author(s):  
Svetlana N. Dedysh ◽  
Claudia Knief ◽  
Peter F. Dunfield
Keyword(s):  
Methane Oxidation ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Methanotrophic Bacteria ◽  
Soluble Methane Monooxygenase ◽  
Cell Counts ◽  
Carbon Compounds ◽  
Methane Fluxes ◽  
The One ◽  
Pcr Targeting

ABSTRACT All aerobic methanotrophic bacteria described to date are unable to grow on substrates containing carbon-carbon bonds. Here we demonstrate that members of the recently discovered genus Methylocella are an exception to this. These bacteria are able to use as their sole energy source the one-carbon compounds methane and methanol, as well as the multicarbon compounds acetate, pyruvate, succinate, malate, and ethanol. To conclusively verify facultative growth, acetate and methane were used as model substrates in growth experiments with the type strain Methylocella silvestris BL2. Quantitative real-time PCR targeting the mmoX gene, which encodes a subunit of soluble methane monooxygenase, showed that copies of this gene increased in parallel with cell counts during growth on either acetate or methane as the sole substrate. This verified that cells possessing the genetic basis of methane oxidation grew on acetate as well as methane. Cloning of 16S rRNA genes and fluorescence in situ hybridization with strain-specific and genus-specific oligonucleotide probes detected no contaminants in cultures. The growth rate and carbon conversion efficiency were higher on acetate than on methane, and when both substrates were provided in excess, acetate was preferably used and methane oxidation was shut down. Our data demonstrate that not all methanotrophic bacteria are limited to growing on one-carbon compounds. This could have major implications for understanding the factors controlling methane fluxes in the environment.

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