scholarly journals IASI-derived NH<sub>3</sub> enhancement ratios relative to CO for the tropical biomass burning regions

2017 ◽  
Author(s):  
Simon Whitburn ◽  
Martin Van Damme ◽  
Lieven Clarisse ◽  
Daniel Hurtmans ◽  
Cathy Clerbaux ◽  
...  
Keyword(s):  
Regional Differences ◽  
Temporal Distribution ◽  
Emission Factors ◽  
Regional Level ◽  
The Other ◽  
Fuel Type ◽  
Broadleaf Forest ◽  
Tropical Regions ◽  
Airborne Measurements ◽  
Vegetation Fires

Abstract. Vegetation fires are a major source of ammonia (NH3) in the atmosphere. Their emissions are mainly estimated from bottom-up approaches which rely on uncertain emission factors. In this study, we derive new biome-specific NH3 enhancement ratios relative to carbon monoxide (CO), ERNH3/CO – directly related to the emission factors, from the measurements of the IASI sounder on board the Metop-A satellite. This is achieved for large tropical regions and for a 8-year period (2008–2015). We find substantial differences in the ERNH3/CO between the studied biomes with calculated values ranging from 4.4 × 10−3 to 17 × 10−3. For Evergreen Broadleaf Forest these are typically 75–100 % higher than for Woody Savanna and Savanna biomes. This variability is attributed to differences in fuel types and size and is in line with previous studies. The analysis of the spatial and temporal distribution of the ERNH3/CO also reveals a (sometimes large) within-biome variability. On a regional level, Woody Savanna shows for example a mean ERNH3/CO for the region of Africa South of the Equator which is 50–100 % lower than in the other five studied regions, probably reflecting regional differences in fuel type and burning conditions. The same variability is also observed on a yearly basis with a peak in the ERNH3/CO observed for the year 2010 for all biomes. These results highlight the need for the development of dynamic emission factors that better take into account local variations in fuel type and fire conditions. We also compare the IASI-derived ERNH3/CO with values reported in the literature, usually calculated from ground-based or airborne measurements. We find a general underestimation over the referenced ERNH3/CO of about 40 % for Woody Savanna and Savanna and up to a factor 1.5–4 for Evergreen Broadleaf Forest and Cropland. Beyond a possible overestimation of the ERNH3/CO in the literature, the observed differences could also be related to various factors including instrumental limits, bias in the retrieval of the NH3 columns, parameterization in the calculation of the ERNH3/CO or accumulation of CO in the studied regions during the fire period.

scholarly journals IASI-derived NH<sub>3</sub> enhancement ratios relative to CO for the tropical biomass burning regions

2017 ◽  
Vol 17 (19) ◽  
pp. 12239-12252 ◽  
Author(s):  
Simon Whitburn ◽  
Martin Van Damme ◽  
Lieven Clarisse ◽  
Daniel Hurtmans ◽  
Cathy Clerbaux ◽  
...  
Keyword(s):  
Regional Differences ◽  
Temporal Distribution ◽  
Emission Factors ◽  
Regional Level ◽  
Fuel Type ◽  
Broadleaf Forest ◽  
Tropical Regions ◽  
Airborne Measurements ◽  
Vegetation Fires ◽  
Good Agreement

Abstract. Vegetation fires are a major source of ammonia (NH3) in the atmosphere. Their emissions are mainly estimated using bottom-up approaches that rely on uncertain emission factors. In this study, we derive new biome-specific NH3 enhancement ratios relative to carbon monoxide (CO), ERNH3 ∕ CO (directly related to the emission factors), from the measurements of the IASI sounder onboard the Metop-A satellite. This is achieved for large tropical regions and for an 8-year period (2008–2015). We find substantial differences in the ERNH3 ∕ CO ratios between the biomes studied, with calculated values ranging from 7  ×  10−3 to 23  ×  10−3. For evergreen broadleaf forest these are typically 50–75 % higher than for woody savanna and savanna biomes. This variability is attributed to differences in fuel types and size and is in line with previous studies. The analysis of the spatial and temporal distribution of the ERNH3 ∕ CO ratio also reveals a (sometimes large) within-biome variability. On a regional level, woody savanna shows, for example, a mean ERNH3 ∕ CO ratio for the region of Africa south of the Equator that is 40–75 % lower than in the other five regions studied, probably reflecting regional differences in fuel type and burning conditions. The same variability is also observed on a yearly basis, with a peak in the ERNH3 ∕ CO ratio observed for the year 2010 for all biomes. These results highlight the need for the development of dynamic emission factors that take into better account local variations in fuel type and fire conditions. We also compare the IASI-derived ERNH3 ∕ CO ratio with values reported in the literature, usually calculated from ground-based or airborne measurements. We find general good agreement in the referenced ERNH3 ∕ CO ratio except for cropland, for which the ERNH3 ∕ CO ratio shows an underestimation of about 2–2.5 times.

scholarly journals Biomass burning aerosol emissions from vegetation fires: particle number and mass emission factors and size distributions

2009 ◽  
Vol 9 (4) ◽  
pp. 17183-17217 ◽  
Author(s):  
S. Janhäll ◽  
M. O. Andreae ◽  
U. Pöschl
Keyword(s):  
Particle Number ◽  
Combustion Efficiency ◽  
Emission Factors ◽  
Fuel Type ◽  
Vegetation Fires ◽  
Fitting Procedures ◽  
Median Diameter ◽  
Count Median Diameter ◽  
Biomass Burning Aerosol ◽  
Aerosol Emissions

Abstract. Aerosol emissions from vegetation fires have a large impact on air quality and climate. In this study, we use published experimental data and different fitting procedures to derive dynamic particle number and mass emission factors (EFPN, EFPM) related to the fuel type, burning conditions and the mass of dry fuel burned, as well as characteristic CO-referenced emission ratios (PN/CO, PM/CO). Moreover, we explore and characterize the variability of the particle size distribution of fresh smoke, which is typically dominated by a lognormal accumulation mode with count median diameter around 120 nm (depending on age, fuel and combustion efficiency), and its effect on the relationship between particle number and mass emission factors. For the particle number emission factor of vegetation fires, we found no dependence on fuel type and obtained the following parameterization as a function of modified combustion efficiency (MCE): EFPN=34·1015×(1-MCE) kg−1±1015 kg−1 with regard to dry fuel mass (d.m.). For the fine particle mass emission factors (EFPM) we obtained (86–85×MCE) g kg−1±3 g kg−1 as an average for all investigated fires; (93–90×MCE) g kg

scholarly journals Biomass burning aerosol emissions from vegetation fires: particle number and mass emission factors and size distributions

2010 ◽  
Vol 10 (3) ◽  
pp. 1427-1439 ◽  
Author(s):  
S. Janhäll ◽  
M. O. Andreae ◽  
U. Pöschl
Keyword(s):  
Experimental Data ◽  
Forest Fires ◽  
Particle Number ◽  
Combustion Efficiency ◽  
Emission Factors ◽  
Fuel Type ◽  
Vegetation Fires ◽  
Aerosol Emissions ◽  
Co Emission ◽  
Emission Ratios

Abstract. Aerosol emissions from vegetation fires have a large impact on air quality and climate. In this study, we use published experimental data and different fitting procedures to derive dynamic particle number and mass emission factors (EFPN, EFPM) related to the fuel type, burning conditions and the mass of dry fuel burned, as well as characteristic CO-referenced emission ratios (PN/CO, PM/CO). Moreover, we explore and characterize the variability of the particle size distribution of fresh smoke, which is typically dominated by a lognormal accumulation mode with count median diameter around 120 nm (depending on age, fuel and combustion efficiency), and its effect on the relationship between particle number and mass emission factors. For the particle number emission factor of vegetation fires, we found no dependence on fuel type and obtained the following parameterization as a function of modified combustion efficiency (MCE): EFPN=34×1015×(1−MCE) kg−1±1015 kg−1 with regard to dry fuel mass (d.m.). For the fine particle mass emission factors (EFPM) we obtained (86–85×MCE) g kg−1±3 g kg−1 as an average for all investigated fires; (93–90×MCE) g kg−1±4 g kg−1 for forest; (67–65×MCE) g kg−1±2 g kg−1 for savanna; (63–62×MCE) g kg−1±1 g kg−1 for grass. For the PN/CO emission ratio we obtained an average of (34±16) cm−3 ppb−1 exhibiting no systematic dependence on fuel type or combustion efficiency. The average PM/CO emission ratios were (0.09±0.04) g g−1 for all investigated fires; (0.13±0.05) g g−1 for forest; (0.08±0.03) g g−1 for savanna; and (0.07±0.03) g g−1 for grass. The results are consistent with each other, given that particles from forest fires are on average larger than those from savanna and grass fires. This assumption and the above parameterizations represent the current state of knowledge, but they are based on a rather limited amount of experimental data which should be complemented by further measurements. Nevertheless, the presented parameterizations appear sufficiently robust for exploring the influence of vegetation fires on aerosol particle number and mass concentrations in regional and global model studies.

The Size of Societies, Stratification, and Belief in High Gods Supportive of Human Morality

1995 ◽  
Vol 14 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Frans L. Roes
Keyword(s):  
Regional Differences ◽  
Cross Cultural ◽  
The Other ◽  
Positive Relation ◽  
Other Hand ◽  
High Gods

Two hypotheses about belief in high gods supportive of human morality were tested with data from the Ethnographic Atlas and the Standard Cross-Cultural Sample. A significant positive relation between the size of societies and such a belief is demonstrated, and this relation appears to be independent of both regional differences and differences in stratification of the societies. On the other hand, stratification itself is also significantly related with the belief in high gods supportive of human morality, but this relation could not be shown to be independent of regional differences or differences in size.

scholarly journals An Analysis of the Energetics of Tropical and Extra-Tropical Regions for Warm ENSO Composite Episodes

2017 ◽  
Vol 32 (1) ◽  
pp. 39-51
Author(s):  
Zayra Christine Sátyro ◽  
José Veiga
Keyword(s):  
Kinetic Energy ◽  
Potential Energy ◽  
El Niño ◽  
Energy Production ◽  
El Nino ◽  
Southern Oscillation ◽  
Stable Condition ◽  
The Other ◽  
Tropical Regions ◽  
Using Data

Abstract This study focuses on the quantification and evaluation of the effects of ENSO (El Niño Southern Oscillation) warm phases, using a composite of five intense El Niño episodes between 1979 – 2011 on the Energetic Lorenz Cycle for four distinct regions around the globe: 80° S – 5° N (region 1), 50° S – 5° N (region 2), 30° S – 5° N (region 3), and 30° S – 30° N (region 4), using Data from NCEP reanalysis-II. Briefly, the results showed that zonal terms of potential energy and kinetic energy were intensified, except for region 1, where zonal kinetic energy weakened. Through the analysis of the period in which higher energy production is observed, a strong communication between the available zonal potential and the zonal kinetic energy reservoirs can be identified. This communication weakened the modes linked to eddies of potential energy and kinetic energy, as well as in the other two baroclinic conversions terms. Furthermore, the results indicate that for all the regions, the system itself works to regain its stable condition.

scholarly journals In vivo tracking of transplanted macrophages with near infrared fluorescent dye reveals temporal distribution and specific homing in the liver that can be perturbed by clodronate liposomes

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242488
Author(s):  
Satoshi Nishiwaki ◽  
Shigeki Saito ◽  
Kyosuke Takeshita ◽  
Hidefumi Kato ◽  
Ryuzo Ueda ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Normal State ◽  
Near Infrared ◽  
Temporal Distribution ◽  
Organ Damage ◽  
The Other ◽  
Acquired Immunity ◽  
Activated Macrophages ◽  
Clodronate Liposomes

Macrophages play an indispensable role in both innate and acquired immunity, while the persistence of activated macrophages can sometimes be harmful to the host, resulting in multi-organ damage. Macrophages develop from monocytes in the circulation. However, little is known about the organ affinity of macrophages in the normal state. Using in vivo imaging with XenoLight DiR®, we observed that macrophages showed strong affinity for the liver, spleen and lung, and weak affinity for the gut and bone marrow, but little or no affinity for the kidney and skin. We also found that administered macrophages were still alive 168 hours after injection. On the other hand, treatment with clodronate liposomes, which are readily taken up by macrophages via phagocytosis, strongly reduced the number of macrophages in the liver, spleen and lung.

scholarly journals Regional differences in the economical sustainability of sports halls

2016 ◽  
Vol 10 (4-5) ◽  
pp. 85-91
Author(s):  
Nikolett Kosztin ◽  
Ildikó Balatoni
Keyword(s):  
Regional Differences ◽  
Great Plain ◽  
The Other ◽  
Competitive Sport ◽  
Sports Facilities ◽  
Northern Great Plain ◽  
Healthy Development ◽  
Leisure Sports ◽  
Jel Code ◽  
Sport Events

The precondition of a health conscious behaviour in a community is establishing a healthy development of the community, an important part of which is the community’s attitude to sports and health. A basic manifestation of this is whether the leadership of a specific settlement is committed to developing sports facilities and, on the other hand, to what extent residents make use of these facilities. The aim of our research was to point out the number of sports facilities currently available for catering everyday physical education introduced in 2012, leisure sports and competitive sport events in two different regions of Hungary. We also examined the resources available for maintaining the facilities and the degree to which existing facilities are exploited. Existing sports halls of the Northern Great Plain and Central Transdanubia were included in the research. We wish to emphasise, in regards to the infrastructural developments of the coming few years, that it is essential to consider the fact, even in the planning phase of facilities, that sport events in themselves do not make the facilities economically sustainable. JEL code: Z20

scholarly journals Comprehensive Evaluation of the Provincial Sustainable Tourismization Level in China and Its Temporal and Spatial Differences

2021 ◽  
Vol 13 (18) ◽  
pp. 10475
Author(s):  
Yuwei He ◽  
Hui Zhang
Keyword(s):  
Regional Differences ◽  
Comprehensive Evaluation ◽  
Temporal Distribution ◽  
Entropy Method ◽  
Evaluation Index System ◽  
Three Dimensions ◽  
Theil Index ◽  
Eastern Region ◽  
Development Mode ◽  
Policy And Strategy

Sustainable tourismization is a favorable development mode and pathway for the promotion of the coordinated development of the economy, society, and ecology. Based on the connotations of tourismization, a comprehensive evaluation index system of sustainable tourismization was constructed. This system consists of three dimensions: consumption tourismization, spatial tourismization, and industrial tourismization. The level, spatial, and temporal distribution characteristics, and differences in sustainable tourismization among China’s provinces from 2009 to 2018 were measured and analyzed using the improved entropy method, the Theil index, a spatial autocorrelation analysis, and other methods. It was found that the level of provincial sustainable tourismization in China has steadily increased over time, with the eastern region taking the lead. The overall differences and inter-regional differences in terms of the provincial sustainable tourismization level have generally decreased year-by-year. The intraregional differences within the eastern region were found to be the largest, and the rate of contribution of inter-regional differences to overall differences was shown to decrease gradually, while the rate of contribution of intraregional differences within the western region increased gradually. A positive spatial correlation in the provincial sustainable tourismization level was identified, and the spatial agglomeration effect showed an increasing trend. The spatial dependence was mainly characterized by “high–high” (HH) agglomeration, showing a ladder difference of “higher in the east and lower in the west”. The results of this study were used to identify where emphasis should be placed in terms of policy and strategy.

Two types of reservoir-induced seismicity

1988 ◽  
Vol 78 (6) ◽  
pp. 2025-2040
Author(s):  
D.W. Simpson ◽  
W.S. Leith ◽  
C.H. Scholz
Keyword(s):  
Normal Stress ◽  
Pore Pressure ◽  
Induced Seismicity ◽  
Elastic Stress ◽  
Pore Space ◽  
Temporal Distribution ◽  
The Other ◽  
Elastic Response ◽  
Reservoir Induced Seismicity ◽  
Effective Normal Stress

Abstract The temporal distribution of induced seismicity following the filling of large reservoirs shows two types of response. At some reservoirs, seismicity begins almost immediately following the first filling of the reservoir. At others, pronounced increases in seismicity are not observed until a number of seasonal filling cycles have passed. These differences in response may correspond to two fundamental mechanisms by which a reservoir can modify the strength of the crust—one related to rapid increases in elastic stress due to the load of the reservoir and the other to the more gradual diffusion of water from the reservoir to hypocentral depths. Decreased strength can arise from changes in either elastic stress (decreased normal stress or increased shear stress) or from decreased effective normal stress due to increased pore pressure. Pore pressure at hypocentral depths can rise rapidly, from a coupled elastic response due to compaction of pore space, or more slowly, with the diffusion of water from the surface.

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