نتایج جستجو برای: ch4 storage
تعداد نتایج: 191067 فیلتر نتایج به سال:
An assessment of within field spatial variations in grain yield and methane (CH4) emission was conducted in lowland rice fields of Myanmar. Two successive rice fields (1(st) field and 2(nd) field) were divided into fertilized and non-fertilized parts and CH4 measurements were conducted at the inlet, middle and outlet positions of each field. The results showed that CH4 emissions at non-fertiliz...
Recently reported summertime methane (CH4) emissions (6.7 +/- 13.3 mg CH4/(m2 x hr)) from newly created marshes in the drawdown area of the Three Gorges Reservoir (TGR), China have triggered broad concern in academic circles and among the public. The CH4 emissions from TGR water surfaces and drawdown areas were monitored from 3rd June to 16th October 2010 with floating and static chambers and g...
[1] Methane (CH4) emissions from wetland ecosystems in nothern high latitudes provide a potentially positive feedback to global climate warming. Large uncertainties still remain in estimating wetland CH4 emisions at regional scales. Here we develop a statistical model of CH4 emissions using an artificial neural network (ANN) approach and field observations of CH4 fluxes. Six explanatory variabl...
The natural wetlands of the Tibetan Plateau (TP) are considered to be an important natural source of methane (CH4) to the atmosphere. The long-term variation in CH4 associated with climate change and wetland loss is still largely unknown. From 1950 to 2010, CH4 emissions over the TP were analyzed using a model framework that integrates CH4MODwetland, TOPMODEL, and TEM models. Our simulation rev...
The two-body purely translational, collision-induced light scattering spectra of CH4-CH 4, CH4-Ar, and CH4-Xe at 295 K are deduced by subtraction of the collision-induced rotational Raman scattering component from the total spectrum. For CH4-CH4, the zeroth moments of the total and purely translational spectrum are 205"4 ___ 14A 9 and 203"8 _ 14,~ 9 respectively. The CH4-CH 4 translational mome...
Abstract. Gas flaring is a substantial global source of carbon emissions to atmosphere and targeted as route mitigating the oil gas sector footprint due waste resources involved. However, quantifying from resource-intensive, no studies have yet assessed for offshore regions. In this work, we present dioxide (CO2), methane (CH4), ethane (C2H6), NOx (nitrogen oxide) data 58 emission plumes identi...
Together with water vapour and carbon dioxide (CO2), methane (CH4) is an important contributor to the warming of the atmosphere. The atmospheric mixing ratios of so-called greenhouse gases, CO2, and nitrous oxide (N2O) have increased about 31%, and 17%, respectively, above pre-industrial values, whereas CH4 has increased 151 ± 25%, (Watson et al., 2001). The CH4 concentration in 2005 of about 1...
[1] Methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), and C2–C5 alkanes were measured throughout the Los Angeles (L.A.) basin in May and June 2010. We use these data to show that the emission ratios of CH4/CO and CH4/CO2 in the L.A. basin are larger than expected from population-apportioned bottom-up state inventories, consistent with previously published work. We use experimentally de...
Coastal upwelling ecosystems are areas of high productivity and strong outgassing, where most gases, such as N2O and CH4, are produced in subsurface waters by anaerobic metabolisms. We describe seasonal CH4 variation as well as potential mechanisms producing CH4 in surface waters of the central Chile upwelling ecosystem (36 S). Surface waters were always supersaturated in CH4 (from 125% up to 5...
Methane (CH4) emission, which is mainly produced during normal fermentation of feeds by the rumen microorganisms, represents a major contributor to the greenhouse gas (GHG) emissions. Several enteric CH4 mitigation technologies have been explored recently. A number of new techniques have also been developed and existing techniques have been improved in order to evaluate CH4 mitigation technolog...
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