scholarly journals The Role of US Households in Global Carbon Emissions

10.5772/32643 ◽  
2012 ◽  
Author(s):  
Md Rumi
Keyword(s):  
Carbon Emissions ◽  
Global Carbon

Role of aquaculture pond sediments in sequestration of annual global carbon emissions

2010 ◽  
Vol 158 (8) ◽  
pp. 2537-2540 ◽  
Author(s):  
Claude E. Boyd ◽  
C. Wesley Wood ◽  
Philip L. Chaney ◽  
Julio F. Queiroz
Keyword(s):  
Carbon Emissions ◽  
Aquaculture Pond ◽  
Pond Sediments ◽  
Global Carbon

The role of outsourcing in driving global carbon emissions

2016 ◽  
Vol 28 (2) ◽  
pp. 168-182 ◽  
Author(s):  
Arunima Malik ◽  
Jun Lan
Keyword(s):  
Carbon Emissions ◽  
Global Carbon

scholarly journals Global carbon budget of reservoirs is overturned by the quantification of drawdown areas

2021 ◽  
Author(s):  
Philipp S. Keller ◽  
Rafael Marcé ◽  
Biel Obrador ◽  
Matthias Koschorreck
Keyword(s):  
Carbon Emissions ◽  
Carbon Budget ◽  
Water Level Fluctuations ◽  
Emission Rates ◽  
Global Carbon Budget ◽  
Carbon Burial ◽  
Reservoir Drawdown ◽  
The Tropics ◽  
Global Carbon

AbstractReservoir drawdown areas—where sediment is exposed to the atmosphere due to water-level fluctuations—are hotspots for carbon dioxide (CO2) emissions. However, the global extent of drawdown areas is unknown, precluding an accurate assessment of the carbon budget of reservoirs. Here we show, on the basis of satellite observations of 6,794 reservoirs between 1985 and 2015, that 15% of the global reservoir area was dry. Exposure of drawdown areas was most pronounced in reservoirs close to the tropics and shows a complex dependence on climatic (precipitation, temperature) and anthropogenic (water use) drivers. We re-assessed the global carbon emissions from reservoirs by apportioning CO2 and methane emissions to water surfaces and drawdown areas using published areal emission rates. The new estimate assigns 26.2 (15–40) (95% confidence interval) TgCO2-C yr−1 to drawdown areas, and increases current global CO2 emissions from reservoirs by 53% (60.3 (43.2–79.5) TgCO2-C yr−1). Taking into account drawdown areas, the ratio between carbon emissions and carbon burial in sediments is 2.02 (1.04–4.26). This suggests that reservoirs emit more carbon than they bury, challenging the current understanding that reservoirs are net carbon sinks. Thus, consideration of drawdown areas overturns our conception of the role of reservoirs in the carbon cycle.

scholarly journals CO2 dynamics and heterogeneity in a cave atmosphere: role of ventilation patterns and airflow pathways

2021 ◽  
Author(s):  
Lovel Kukuljan ◽  
Franci Gabrovšek ◽  
Matthew D. Covington ◽  
Vanessa E. Johnston
Keyword(s):  
Temporal Variations ◽  
Observation Point ◽  
Spatially Distributed ◽  
Combined Action ◽  
Karst Systems ◽  
The Relationship ◽  
Co2 Dynamics ◽  
Global Carbon

AbstractUnderstanding the dynamics and distribution of CO2 in the subsurface atmosphere of carbonate karst massifs provides important insights into dissolution and precipitation processes, the role of karst systems in the global carbon cycle, and the use of speleothems for paleoclimate reconstructions. We discuss long-term microclimatic observations in a passage of Postojna Cave, Slovenia, focusing on high spatial and temporal variations of pCO2. We show (1) that the airflow through the massif is determined by the combined action of the chimney effect and external winds and (2) that the relationship between the direction of the airflow, the geometry of the airflow pathways, and the position of the observation point explains the observed variations of pCO2. Namely, in the terminal chamber of the passage, the pCO2 is low and uniform during updraft, when outside air flows to the site through a system of large open galleries. When the airflow reverses direction to downdraft, the chamber is fed by inlets with diverse flow rates and pCO2, which enter via small conduits and fractures embedded in a CO2-rich vadose zone. If the spatial distribution of inlets and outlets produces minimal mixing between low and high pCO2 inflows, high and persistent gradients in pCO2 are formed. Such is the case in the chamber, where vertical gradients of up to 1000 ppm/m are observed during downdraft. The results presented in this work provide new insights into the dynamics and composition of the subsurface atmosphere and demonstrate the importance of long-term and spatially distributed observations.

Dust Thou Art Not & unto Dust Thou Shan't Return: Common Mistakes in Teaching Biogeochemical Cycles

2010 ◽  
Vol 72 (9) ◽  
pp. 552-556 ◽  
Author(s):  
Dan O'Connell
Keyword(s):  
Carbon Dioxide ◽  
Carbon Emissions ◽  
Biogeochemical Cycles ◽  
Interest In Science

When describing biogeochemical transfers, textbook authors have often overstated the role of soil while neglecting the role of carbon dioxide. Unfortunately, these errors align with naive biogeochemical intuitions. This article aims to increase awareness of the prevalence of such misconceptions and offers countermeasures. Avoiding these misconceptions becomes increasingly important as concerns over carbon emissions grow. In addition, because an accurate understanding of biogeochemical cycles can transform deeply held beliefs, successfully teaching this topic can have the collateral benefit of inspiring lasting interest in science.

Dynamic carbon mitigation analysis: the role of thin-film photovoltaics

2014 ◽  
Vol 7 (6) ◽  
pp. 1810-1818 ◽  
Author(s):  
C. J. M. Emmott ◽  
N. J. Ekins-Daukes ◽  
J. Nelson
Keyword(s):  
Thin Film ◽  
Power Generation ◽  
Carbon Emissions ◽  
Carbon Mitigation ◽  
Photovoltaic Power ◽  
Thin Film Photovoltaics

We assess the net carbon emissions during a transition to photovoltaic power generation, comparing established and emerging thin-film PV technologies.

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