scholarly journals Extreme Methane Bubbling Emissions from a Subtropical Shallow Eutrophic Pond

2014 ◽  
Vol 1 (2) ◽  
Author(s):  
Shangbin Xiao ◽  
◽  
Weiguo Liu ◽  
Hong Yang ◽  
Defu Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Global Warming Potential ◽  
Anaerobic Degradation ◽  
Ch4 Emission ◽  
Ch4 Flux ◽  
Air Interface ◽  
Gas Fluxes ◽  
First Time ◽  
And Diffusion

For the first time we report on real time diel bubble and diffusion gas fluxes lasting for 48 hours of a subtropical shallow pond. The averaged diffusion fluxes of methane and carbon dioxide were 0.074 and 62.70 mg•m-2•h-1, and the averaged ebullition fluxes of methane and carbon dioxide were 24.726 and 1.92 mg•m-2•h-1 respectively. Bubble emissions of CH4 and CO2 accounted for 99.7% of the total CH4 emission and only 3.0% of the totalCO2 from the pond respectively. The CH4 flux across the water-air interface of the pond was 595.20 mg•m-2•h-1 and equaledCO2 flux of 14880.0 mg•m-2•d-1 by multiplying its global warming potential. Thus, the small pond added equivalent of 35.712 kg/dCO2 emission by transferring CO2 to CH4 in the summer, in which process CO2 was absorbed owing to alga propagation and CH4 emission was derived from the anaerobic degradation of dead alga buried on its bottom.

scholarly journals Variation in Soil Properties Regulate Greenhouse Gas Fluxes and Global Warming Potential in Three Land Use Types on Tropical Peat

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 465 ◽  
Author(s):  
Kiwamu Ishikura ◽  
Untung Darung ◽  
Takashi Inoue ◽  
Ryusuke Hatano
Keyword(s):  
Global Warming ◽  
Soil Moisture ◽  
Groundwater Level ◽  
Global Warming Potential ◽  
C:N Ratio ◽  
Co2 Flux ◽  
Nitrate Content ◽  
N2o Flux ◽  
Ch4 Flux ◽  
In The Beginning

This study investigated spatial factors controlling CO2, CH4, and N2O fluxes and compared global warming potential (GWP) among undrained forest (UDF), drained forest (DF), and drained burned land (DBL) on tropical peatland in Central Kalimantan, Indonesia. Sampling was performed once within two weeks in the beginning of dry season. CO2 flux was significantly promoted by lowering soil moisture and pH. The result suggests that oxidative peat decomposition was enhanced in drier position, and the decomposition acidify the peat soils. CH4 flux was significantly promoted by a rise in groundwater level, suggesting that methanogenesis was enhanced under anaerobic condition. N2O flux was promoted by increasing soil nitrate content in DF, suggesting that denitrification was promoted by substrate availability. On the other hand, N2O flux was promoted by lower soil C:N ratio and higher soil pH in DBL and UDF. CO2 flux was the highest in DF (241 mg C m−2 h−1) and was the lowest in DBL (94 mg C m−2 h−1), whereas CH4 flux was the highest in DBL (0.91 mg C m−2 h−1) and was the lowest in DF (0.01 mg C m−2 h−1), respectively. N2O flux was not significantly different among land uses. CO2 flux relatively contributed to 91–100% of GWP. In conclusion, it is necessary to decrease CO2 flux to mitigate GWP through a rise in groundwater level and soil moisture in the region.

CO2 decomposition in a packed DBD plasma reactor: influence of packing materials

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39492-39499 ◽  
Author(s):  
Debjyoti Ray ◽  
Ch. Subrahmanyam
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Global Warming Potential ◽  
Plasma Reactor ◽  
Dbd Plasma ◽  
Packing Materials ◽  
Significant Interest ◽  
Co2 Decomposition

Carbon dioxide (CO2) decomposition has drawn significant interest over the years due to its global warming potential.

scholarly journals Ranking Renewable and Fossil Fuels on Global Warming Potential Using Respiratory Quotient Concept

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Kalyan Annamalai ◽  
Siva Sankar Thanapal ◽  
Devesh Ranjan
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Global Warming Potential ◽  
Respiratory Quotient ◽  
Fossil Fuels ◽  
Blood Stream ◽  
The Body ◽  
Solid Fuels ◽  
Exhaust Gas ◽  
Pure Carbon

Carbon dioxide (CO2) is one of the greenhouse gases which cause global warming. The amount of fossil fuels consumed to meet the demands in the areas of power and transportation is projected to increase in the upcoming years. Depending on carbon content, each power plant fuel has its own potential to produce carbon dioxide. Similarly, the humans consume food containing carbohydrates (CH), fat, and protein which emit CO2 due to metabolism. The biology literature uses respiratory quotient (RQ), defined as the ratio of CO2 moles exhausted per mole of O2 consumed within the body, to estimate CO2 loading in the blood stream and CO2 in nasal exhaust. Here, we apply that principle in the field of combustion to relate the RQ to CO2 emitted in tons per GJ of energy released when a fuel is combusted. The RQ value of a fuel can be determined either from fuel chemical formulae (from ultimate analyses for most liquid and solid fuels of known composition) or from exhaust gas analyses. RQ ranges from 0.5 for methane (CH4) to 1 for pure carbon. Based on the results obtained, the lesser the value of “RQ” of a fuel, the lower its global warming potential. This methodology can be further extended for an “online instantaneous measurement of CO2” in automobiles based on actual fuel use irrespective of fuel composition.

scholarly journals Global warming potential of the production phase based on the example of a hotel regarding two different construction variants

2021 ◽  
Vol 2069 (1) ◽  
pp. 012232
Author(s):  
Sarah M. Engel ◽  
Manuela Walsdorf-Maul ◽  
Michael Schneider
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Life Cycle ◽  
Global Warming Potential ◽  
Carbon Dioxide Emissions ◽  
Energy Performance ◽  
Point Of View ◽  
Major Influence ◽  
Life Cycle Assessments ◽  
Production Phase

Abstract The construction industry has a major influence on man-made carbon dioxide emissions. Being sustainable also means reducing or neutralizing our carbon dioxide pollution in the future. This research and the corresponding work are therefore guided by the following question: Is it possible and useful to conduct life cycle assessments and at the same time analyze the environmental impact of the construction sector? In the context of this work, a life cycle assessment of a building is performed using the example of a hotel building. All construction elements of the thermal envelope are examined from an environmental point of view by considering the global warming potential of each part of the construction. The aim of the study is to draw conclusions about the parameters that are decisive for the construction of a hotel building from an ecological standpoint in the production phase. Based on the results of the study, we want to drive the development of a “future” energy performance certificate forward that graphically illustrates the evaluation of buildings under both aspects - energy efficiency (final energy) and sustainability (GWP - global warming potential).

Carbon Dioxide Adsorbent Preparation by Coating Amine-Functionalized Pectin onto Zeolites

2019 ◽  
Vol 801 ◽  
pp. 179-184
Author(s):  
John Andrew Kane P. Jovellana ◽  
B. Pajarito
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Global Warming ◽  
Surface Area ◽  
Carbon Dioxide Capture ◽  
Amine Functionalization ◽  
Amine Functionalized ◽  
Adsorption Capacities ◽  
First Time

Increasing carbon dioxide (CO2) levels in the atmosphere caused by excessive greenhouse gas emissions is strongly associated to global warming and climate change. This study aims to prove the feasibility of using pectin as the backbone for amine functionalization with application as coating on zeolites for carbon dioxide capture. Characterization of the solutions using FTIR and of the adsorbents using SEM demonstrated the successful modification of pectin using NH3 and TETA as alternative amine-functionalized coating for adsorbent. It has been reported for the first time that the polysaccharide pectin can be aminated and modified for CO2 capture upon coated on substrates such as zeolites. The adsorption capacities at 5% breakthrough of the adsorbents coated with the modified pectin are 2.24 mmol/CO2 g adsorbent and 2.28 mmol/CO2 g adsorbent, when coated with NH3-modified and TETA-modified pectin, respectively. It is recommended for further study to synthesize substrates with higher surface area, and optimize the formulations of the pectin modification.

A review on materials and processes for carbon dioxide separation and capture

2021 ◽  
pp. 0958305X2110509
Author(s):  
R Maniarasu ◽  
Sushil Kumar Rathore ◽  
S. Murugan
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Global Warming Potential ◽  
Carbon Dioxide Emissions ◽  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Point Sources ◽  
Continuous Increase ◽  
Physical And Chemical ◽  
And Storage

In today’s world, owing to industrial expansion, urbanization, the rapid growth of the human population, and the high standard of living, the utilization of the most advanced technologies is unavoidable. The enhanced anthropogenic activities worldwide result in a continuous increase in global warming potential, thereby raising a global concern. The constant rise in global warming potential forces the world to mitigate greenhouse gases, particularly carbon dioxide. Carbon dioxide is considered as the primary contributor responsible for global warming and climatic changes. The global anthropogenic carbon dioxide emissions released into the atmosphere can eventually deteriorate the environment and endanger the ecosystem. Combating global warming is one of the main challenges in achieving sustainable development. Carbon capture and storage is a potential solution to mitigate carbon dioxide emissions. There are three main methods for carbon capture and storage: post-combustion, pre-combustion, and oxy-fuel combustion. Among them, post-combustion is used in thermal power plants and industrial sectors, all of which contribute a significant amount of carbon dioxide. Different techniques such as physical and chemical absorption, physical and chemical adsorption, membrane separation, and cryogenic distillation used for carbon capture are thoroughly discussed and presented. Currently, there are various materials including absorbents, adsorbents, and membranes used in carbon dioxide capture. Still, there is a search for new and novel materials and processes for separating and capturing carbon dioxide. This review article provides a comprehensive review of different methods, techniques, materials, and processes used for separating and capturing carbon dioxide from significant stationary point sources.

The End of Meat

World on Fire ◽  
2021 ◽  
pp. 109-128
Author(s):  
Mark Rowlands
Keyword(s):  
Carbon Dioxide ◽  
Global Warming ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Global Warming Potential ◽  
Energy Supply ◽  
Fossil Fuels ◽  
Gas Emissions ◽  
Eating Meat ◽  
Very High

The edge required by renewable technologies is provided by a simplification of the energy supply train. This simplification consists in no longer eating animals. Animals have upside-down energy returned on energy invested values (EROIs), with up to 30 times as much energy having to be put into raising them as we get out of them through eating them or their products. At one time, when our fossil fuels sported extraordinarily high EROIs—100:1 in some cases—we could afford to take this sort of hit on our food-based energy supply. Now, however, we can no longer afford to do so. Moreover, the results of this grossly inefficient energy exchange are rising greenhouse gas emissions. By no longer eating meat, we can reduce greenhouse gas emissions by roughly 14%. Importantly, much of this reduction will be in methane and nitrous dioxide, which have very high global warming potential relative to carbon dioxide.

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