scholarly journals Seasonality of greenhouse gas emission factors from biomass burning in the Brazilian Cerrado

2020 ◽  
Author(s):  
Roland Vernooij ◽  
Marcos Vinicius Giongo Alves ◽  
Marco Assis Borges ◽  
Máximo Menezes Costa ◽  
Ana Carolina Sena Barradas ◽  
...  
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Biomass Burning ◽  
Large Scale ◽  
Greenhouse Gas Emission ◽  
Emission Factors ◽  
Dry Season ◽  
Total Carbon ◽  
Vegetation Types ◽  
Gas Emission

Abstract. Landscape fires, often referred to as biomass burning (BB), emit substantial amounts of (greenhouse) gases and aerosols into the atmosphere each year. Frequently burning savannas, mostly in Africa, Australia, and South America are responsible for over 60 % of total BB carbon emissions. Compared to many other sources of emissions, fires have a strong seasonality. Previous research has identified the mitigation potential of prescribed fires in savanna ecosystems; by burning early in the dry season when the vegetation has not fully cured, fires are in general patchier and burn less intense. While it is widely accepted that burned area and the total carbon consumed is lower when fires are ignited early in the dry season, little is known about the seasonality of emission factors (EF) of greenhouse gases. This is important because potentially, higher EFs in the early dry season (EDS) could offset some of the carbon benefits of EDS burning. Also, a better understanding of EF seasonality may improve large-scale BB assessments, which to date rely on temporally-static EFs. We used a sampling system mounted on an unmanned aerial vehicle (UAV) and cavity ring-down spectroscopy to estimate CO2, CO, CH4, and N2O EFs in the Estação Ecológica Serra Geral do Tocantins in the Brazilian states of Tocantins and Bahia. The protected area contains all major Cerrado vegetation types found in Brazil, and EDS burning was implemented on a large scale since 2014. We collected and analyzed over 800 smoke samples during the EDS and late dry season (LDS). Averaged over all measurements, the modified combustion efficiency (MCE) was slightly higher in the LDS (0.976 vs. 0.972) and the CH4 and CO EFs were 13 % and 15 % lower in the LDS compared to the EDS. This seasonal effect was larger in more wood-dominated vegetation types. N2O EFs showed a more complex seasonal dependency, with opposite seasonal trends for savannas that were dominated by grasses versus those with abundant shrubs. We found that the N2O EF for the open cerrado was less than half of those reported so far in the BB literature for savannas. This may indicate a substantial overestimation of the contribution of fires in the N2O budget. Overall, our data implies that in this region, seasonal variability in greenhouse gas emission factors may offset only a small fraction of the carbon mitigation gains in fire abatement programs.

scholarly journals Intraseasonal variability of greenhouse gas emission factors from biomass burning in the Brazilian Cerrado

2021 ◽  
Vol 18 (4) ◽  
pp. 1375-1393
Author(s):  
Roland Vernooij ◽  
Marcos Giongo ◽  
Marco Assis Borges ◽  
Máximo Menezes Costa ◽  
Ana Carolina Sena Barradas ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Biomass Burning ◽  
Greenhouse Gas Emission ◽  
Intraseasonal Variability ◽  
Emission Factors ◽  
Dry Season ◽  
Total Carbon ◽  
Seasonal Effect ◽  
Vegetation Types ◽  
Gas Emission

Abstract. Landscape fires, often referred to as biomass burning (BB), emit substantial amounts of (greenhouse) gases and aerosols into the atmosphere each year. Frequently burning savannas, mostly in Africa, Australia, and South America are responsible for over 60 % of total BB carbon emissions. Compared to many other sources of emissions, fires have a strong seasonality. Previous research has identified the mitigation potential of prescribed fires in savanna ecosystems; by burning cured fuels early in the dry season when landscape conditions still provide moist buffers against fire spread, fires are in general smaller, patchier, and less intense. While it is widely accepted that burned area (BA) and the total carbon consumed are lower when fires are ignited early in the dry season, little is known about the intraseasonal variability of emission factors (EFs). This is important because potentially, higher EFs in the early dry season (EDS) could offset some of the carbon benefits of EDS burning. Also, a better understanding of EF intraseasonal variability may improve large-scale BB assessments, which to date rely on temporally static EFs. We used a sampling system mounted on an unmanned aerial vehicle (UAV) to sample BB smoke in the Estação Ecológica Serra Geral do Tocantins in the Brazilian states of Tocantins and Bahia. The protected area contains all major Cerrado vegetation types found in Brazil, and EDS burning has been implemented since 2014. Over 800 smoke samples were collected and analysed during the EDS of 2018 and late dry season (LDS) of 2017 and 2018. The samples were analysed using cavity ring-down spectroscopy, and the carbon balance method was used to estimate CO2, CO, CH4, and N2O EFs. Observed EF averages and standard deviations were 1651 (±50) g kg−1 for CO2, 57.9 (±28.2) g kg−1 for CO, 0.97 (±0.82) g kg−1 for CH4, and 0.096 (±0.174) g kg−1 for N2O. Averaged over all measured fire prone Cerrado types, the modified combustion efficiency (MCE) was slightly higher in the LDS (0.961 versus 0.956), and the CO and CH4 were 10 % and 2.3 % lower in the LDS compared to the EDS. However, these differences were not statistically significant using a two-tailed t test with unequal variance at a 90 % significance level. The seasonal effect was larger in more wood-dominated vegetation types. N2O EFs showed a more complex seasonal dependency, with opposite intraseasonal trends for savannas that were dominated by grasses versus those with abundant shrubs. We found that the N2O EF for the open Cerrado was less than half the EF suggested by literature compilations for savannas. This may indicate a substantial overestimation of the contribution of fires in the N2O budget. Overall, our data imply that in this region, seasonal variability in greenhouse gas emission factors may offset only a small fraction of the carbon mitigation gains in fire abatement programmes.

GREENHOUSE GAS EMISSION FROM COMBUSTION OF ASSOCIATED PETROLEUM GAS IN RUSSIA

2021 ◽  
pp. 54-61
Author(s):  
N. V. Popov ◽  
◽  
I. L. Govor ◽  
M. L. Gitarskii ◽  
◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
Component Composition ◽  
Emission Factors ◽  
Gas Emission ◽  
Associated Petroleum Gas ◽  
Carbon Dioxide Co2

The average weighted long-term component composition of associated petroleum gas burned at the fields in Russia is obtained, where the volume fractions of carbon dioxide (CO2) and methane (CH4) make up 0.8 and 66.4%, respectively. Based on it, the national emission factors of greenhouse gases from the flaring of associated petroleum gas are developed: the values are equal to 2.76 103 t CO2 and 0.0155 103 t CH4 per 1 106 m3 of the gas burnt. The calculations based on the emission factors led to the 37% increase in total equivalent emission of CO2 and CH4 as compared to the calculations based on the IPCC emission factors. The use of the national emission factors increases the reliability of the estimates of greenhouse gas emissions and the evaluation of their impact on climate.

scholarly journals Simultaneous shipborne measurements of CO<sub>2</sub>, CH<sub>4</sub> and CO and their application to improving greenhouse-gas flux estimates in Australia

2019 ◽  
Vol 19 (10) ◽  
pp. 7055-7072 ◽  
Author(s):  
Beata Bukosa ◽  
Nicholas M. Deutscher ◽  
Jenny A. Fisher ◽  
Dagmar Kubistin ◽  
Clare Paton-Walsh ◽  
...  
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Biomass Burning ◽  
Greenhouse Gas Emission ◽  
Anthropogenic Sources ◽  
Climate Feedback ◽  
Eastern Coast ◽  
Sources And Sinks ◽  
Australian Continent ◽  
Carbon Gases

Abstract. Quantitative understanding of the sources and sinks of greenhouse gases is essential for predicting greenhouse-gas–climate feedback processes and their impacts on climate variability and change. Australia plays a significant role in driving variability in global carbon cycling, but the budgets of carbon gases in Australia remain highly uncertain. Here, shipborne Fourier transform infrared spectrometer measurements collected around Australia are used together with a global chemical transport model (GEOS-Chem) to analyse the variability of three direct and indirect carbon greenhouse gases: carbon dioxide (CO2), methane (CH4) and carbon monoxide (CO). Using these measurements, we provide an updated distribution of these gases. From the model, we quantify their sources and sinks, and we exploit the benefits of multi-species analysis to explore co-variations to constrain relevant processes. We find that for all three gases, the eastern Australian coast is largely influenced by local anthropogenic sources, while the southern, western and northern coasts are characterised by a mixture of anthropogenic and natural sources. Comparing coincident and co-located enhancements in the three carbon gases highlighted several common sources from the Australian continent. We found evidence for 17 events with similar enhancement patterns indicative of co-emission and calculated enhancement ratios and modelled source contributions for each event. We found that anthropogenic co-enhancement events are common along the eastern coast, while co-enhancement events in the tropics primarily derive from biomass burning sources. While the GEOS-Chem model generally reproduced the timing of co-enhancement events, it was less able to reproduce the magnitude of enhancements. We used these differences to identify underestimated, overestimated and missing processes in the model. We found model overestimates of CH4 from coal burning and underestimates of all three gases from biomass burning. We identified missing sources from fossil fuel, biofuel, oil, gas, coal, livestock, biomass burning and the biosphere in the model, pointing to the need to further develop and evaluate greenhouse-gas emission inventories for the Australian continent.

scholarly journals Energy Valuation Methods for Biofuels in South Florida: Introduction to Life Cycle Assessment and Emergy Approaches

EDIS ◽  
2013 ◽  
Vol 2013 (3) ◽  
Author(s):  
J. Van Treese, II ◽  
Edward A. Hanlon ◽  
N. Y. Amponsah ◽  
J. L. Izursa ◽  
J. C. Capece
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
South Florida ◽  
Gas Emission ◽  
Assessment Approach ◽  
Environmental Component ◽  
Soil And Water

This 5-page fact sheet gives an overview of two methods for evaluating energy transformations in biofuels production. The Life Cycle Assessment approach involves measurements affecting greenhouse gases, which can be linked to the energy considerations used in the Emergy Assessment. Although these two methods have their basis in energy or greenhouse gas emission evaluations, their approaches can lead to a reliable judgment regarding a biofuel process. We can use them to evaluate the economic environmental component of a biofuel process, and decide which biofuel processes favor sustainability. The intended audiences of this publication are growers, researchers, students, and any other readers interested in agriculture and ecology. Written by J. Van Treese II, E. A. Hanlon, N. Y. Amponsah, J. L. Izursa, and J. C. Capece, and published by the UF Department of Soil and Water Science, March 2013. http://edis.ifas.ufl.edu/ss579

Greenhouse Gas Emission, Rainfall and Crop Production Over North-Western India

2018 ◽  
Vol 11 (1) ◽  
pp. 47-61
Author(s):  
Vinay Kumar ◽  
Sudip Jana ◽  
Amit Bhardwaj ◽  
R. Deepa ◽  
Saroj Kumar Sahu ◽  
...  
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Crop Production ◽  
Greenhouse Gas Emission ◽  
Coupled Model ◽  
Western India ◽  
Gas Emission ◽  
Northwestern India ◽  
Increasing Trend ◽  
One Year

Background: This study is based on datasets acquired from multi sources e.g. rain-gauges, satellite, reanalysis and coupled model for the region of Northwestern India. The influence of rainfall on crop production is obvious and direct. With the climate change and global warming, greenhouse gases are also showing an adverse impact on crop production. Greenhouse gases (e.g. CO2, NO2 and CH4) have shown an increasing trend over Northwestern Indian region. In recent years, rainfall has also shown an increasing trend over Northwestern India, while the production of rice and maize are reducing over the region. From eight selected sites, over Northwestern India, where rice and maize productions have reduced by 40%, with an increase in CO2, NO2 and CH4 gas emission by 5% from 1998 to 2011. Results: The correlation from one year to another between rainfall, gas emission and crop production was not very robust throughout the study period, but seemed to be stronger for some years than others. Conclusion: Such trends and crop yield are attributed to rainfall, greenhouse gas emissions and to the climate variability.

Greenhouse Gas Emission Factor of Scrapped Cable and Wire Recycling Factories

2013 ◽  
Vol 838-841 ◽  
pp. 2811-2817
Author(s):  
Pu Chang ◽  
Mei Fang Lu ◽  
Jim Jui Min Lin
Keyword(s):  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Emission Factor ◽  
Greenhouse Gas Emission ◽  
Electricity Consumption ◽  
Mechanical Method ◽  
Gas Emission ◽  
Processing Plants ◽  
Annual Carbon ◽  
And Control

Carbon footprint of three scrapped cable and wire recycling processing plants was analyzed by examining the annual carbon emission and trend for 2009-2011. Among the six greenhouse gases (CO2, CH4, N2O, SF6, HFCs, and PFCs), the annual emission of CO2 was the highest (>95%), while remaining gases only accounted for less than 5% of the total greenhouse gas emission. When analyzing the collected data based on different frontier categories, Category II (greenhouse gas emission indirect caused by electricity consumption) had the highest emission proportion (>57%). It is because the machines used for the physic-mechanical processing procedure require a lot of electricity. In order to do emission inventory accurately and control the electricity consumption, laws or regulations should stimulate electricity consumption to be recorded and monitored separately for each operation permit. It is also recommended to record and monitor electricity consumption of administration area and the manufacturing/processing area separately. Results of this study revealed that the average emission factor for processing recycled cables and wires using a physic-mechanical method was 0.0474±0.0162 tonnes of CO2e per tonne of material processed. If the calculation was based on the amount of products generated, the EF of average greenhouse gases was 0.1613±0.0589 tonnes of CO2e per tonne of plastics, 0.0766±0.0278 tonnes of CO2e per tonne of copper, 1.7891±1.4572 tonnes of CO2e per tonne of aluminum, and 2.1030±1.6937 tonnes of CO2e per tonne of iron.

Research on Carbon Sequestration and Exchange with Atmosphere of Representative Reed Ecosystem in Wetland

2013 ◽  
Vol 864-867 ◽  
pp. 1021-1024
Author(s):  
Hai Liu ◽  
Shu Yun Yang ◽  
Qing Guo Zhang ◽  
Jian Long Ding ◽  
Feng Wen Wang
Keyword(s):  
Carbon Sequestration ◽  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
River Estuary ◽  
Surface Characteristics ◽  
Total Carbon ◽  
Yangtze River Estuary ◽  
Emission Rates ◽  
Gas Emission ◽  
Average Value

The biomass, carbon sequestration ability and surface characteristics of greenhouse gas emissions of the reed ecosystem were studied in this paper. This reed ecosystem locates in the western beach of Chongming Island which is situated in Yangtze River Estuary. The research target of reed covers about 300 hm2. The biomass was measured by harvest method and the greenhouse gas emission rates were detected by static boxes-gas chromatography. The results showed that the scope of reeds biomass is between 9.10-21.11 kg·m-2, and the average value is 16.85 kg·m-2. The carbon sequestration range between in 4.04-9.38 kg·m-2, and the average is 7.48 kg·m-2. The total carbon sequestration of this reed ecosystem is about 9810 t·a-1, and the net total carbon sequestration is about 8091.58 t·a-1. These results indicated that reed ecosystem of wetland in mid-latitude has strong carbon sequestration ability, and net of carbon appears in the growing season.

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