نتایج جستجو برای: dissolved ch4
تعداد نتایج: 38430 فیلتر نتایج به سال:
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...
Rising temperatures in the Arctic Ocean can cause considerable changes, such as decreased ice cover and increased water inflow from Pacific/Atlantic sector, which may alter dissolved methane (CH4) cycles over Ocean. However, fate of CH4 remains uncertain. Here, we show that Chukchi Sea is enhanced shelf/slope areas, stored Upper Halocline (UHC), transported to central Arctic, contributing exces...
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...
[1] Lake sediments are ‘‘hot spots’’ of methane production in the landscape. However, regional and global lake methane emissions, contributing to the greenhouse effect, are poorly known. We developed predictions of methane emissions from easily measured lake characteristics based on measurements for 11 North American and 13 Swedish lakes, and literature values from 49 lakes. Results suggest tha...
[1] To investigate arsenic mobility in the Bengal Basin groundwater, we sampled water wells and sediments throughout the region. There are strong correlations among high levels of dissolved arsenic and iron, ammonia, and methane, especially in samples from a single site (Laxmipur). No linkage is seen between As and agricultural tracers such as phosphate. The association of As and Fe occurs beca...
Methane (CH4), a potent greenhouse gas, contributes about one third to the global green house gas emissions. CH4-assimilating microbes (mostly methanotrophs) in upland soils play very crucial role in mitigating the CH4 release into the atmosphere. Agricultural, environmental, and climatic shifts can alter CH4 sink profiles of soils, likely through shifts in CH4-assimilating microbial community ...
We develop a dynamic methanogen-available carbon model (DMCM) to quantify the role of the methanogenavailable carbon pool in determining the spatial and temporal variability of tropical wetland CH4 emissions over seasonal timescales. We fit DMCM parameters to satellite observations of CH4 columns from SCIAMACHY CH4 and equivalent water height (EWH) from GRACE. Over the Amazon River basin we fou...
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