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Journal ArticleDOI

Tunable diode laser measurements of methane fluxes from an irrigated rice paddy field in the Philippines

TLDR
In this article, the first micrometeorological-based measurements of CH4 emissions from Asian rice paddies of which we are aware were presented, using the tunable diode laser trace gas analyzer system (TGAS) developed at the University of Guelph.
Abstract
This paper presents the first micrometeorological-based measurements of methane (CH4) emissions from Asian rice paddies of which we are aware. The research features the tunable diode laser trace gas analyzer system (TGAS) recently developed at the University of Guelph. CH4 fluxes were measured between March 9 and 24, 1992, from an irrigated rice paddy field at the International Rice Research Institute (IRRI), the Philippines. The daytime CH4 flux averaged 6.0 μg m−2 s−1. The CH4 fluxes displayed a diurnal trend similar to daily soil temperature curves, with peak emissions of about 8 μg m−2 s−1 in the early afternoon. A tenfold increase in CH4 emissions (to about 70μg m−2 s−1) during a brief weeding experiment resulted from soil disturbance. Up to 25 μg m−2 s−1 of CH4 were released during a drying of the field, after which unsuitable soil redox potentials apparently suppressed methanogenesis. The CH4 flux was also arrested when the field was flooded with oxygen-rich water during a heavy rainstorm.

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Journal ArticleDOI

The global methane budget 2000–2017

Marielle Saunois, +95 more
TL;DR: The second version of the living review paper dedicated to the decadal methane budget, integrating results of top-down studies (atmospheric observations within an atmospheric inverse-modeling framework) and bottom-up estimates (including process-based models for estimating land surface emissions and atmospheric chemistry, inventories of anthropogenic emissions, and data-driven extrapolations) as discussed by the authors.
Journal ArticleDOI

The global methane budget 2000–2012

Marielle Saunois, +81 more
TL;DR: The Global Carbon Project (GCP) as discussed by the authors is a consortium of multi-disciplinary scientists, including atmospheric physicists and chemists, biogeochemists of surface and marine emissions, and socio-economists who study anthropogenic emissions.
Journal ArticleDOI

A review of recent advances in semiconductor laser based gas monitors

TL;DR: In this paper, the main features and applications of tunable diode laser absorption spectroscopy are reviewed and the main characteristics of the currently available semiconductor diode lasers with respect to spectroscopic applications and sensitive detection techniques are discussed.
Journal ArticleDOI

Estimates of nitrous oxide emissions from agricultural fields over 28 months

TL;DR: In this article, the authors report monthly N2O emissions measured using mixtures of field studies conducted throughout the calendar year to improve flux estimates for the greenhouse gas nitrous oxide (N2O).
References
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Journal ArticleDOI

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TL;DR: In this article, the basic relationships are discussed in the context of vertical transfer in the lower atmosphere, and the required corrections to the measured flux are derived, where the correction to measurements of water vapour flux will often be only a few per cent but will sometimes exceed 10 percent.
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Principles and Practices of Rice Production

S. K. de Datta, +1 more
TL;DR: Assembles and summarizes available information from rice research in the world's major rice-growing areas to delineate the principles and practices of rice production for both developed and underdeveloped countries.
Journal ArticleDOI

Methane and nitrous oxide fluxes in native, fertilized and cultivated grasslands

TL;DR: In this article, the authors measured CH4 uptake and N2O emissions in native, nitrogen-fertilized, and wheat-growing prairie soils from spring to late autumn, 1990.
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