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Carbon Cycle

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41 connected topics.


News and Opinion

Coverage of carbon cycle since May 3, 2021.

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Extraordinary carbon emissions from El Nino-induced biomass burning estimated using Japanese aircraft and shipboard observations

"..."Our analysis is the first study that used in-situ high-precision observations for estimating the fire-induced emissions from Equatorial Asia for 2015, which contributes to improving our understanding of biomass burning in this region. It is considered that biomass burning here is dominated by fires in peatland, which has a remarkably high carbon density. Because Equatorial Asia has a significant amount of peatland, the region has a distinct role in the global carbon cycle despite its small terrestrial coverage", Yosuke Niwa (NIES & MRI), the leading author of the study, said..."

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Melting High Mountain Asia glaciers are revealed as a potential source of greenhouse gases

"...According to Dr. Yulan Zhang, the investigator who led the study: "Until now, there were no estimates on the potential climate change caused by greenhouse gas emissions from cryosphere melting in High Mountain Asia. Determining how these data are coupled with biogeochemical models, including feedback between the glacial cryosphere and atmosphere, is required to test the sensitivity of carbon sinks or sources to changes in the terrestrial cryosphere..."

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Arrival of land plants changed Earth's climate control system

"...First author Boriana Kalderon-Asael, a PhD student at Yale University, said: "By measuring lithium isotopes in rocks spanning most of Earth's history, we aimed to investigate if anything had changed in the functioning of the carbon cycle over a large time scale. We found that it had, and this change appears to be linked to the growth of plant life on land and silicon-using animal life in the sea. " In the study, researchers measured lithium isotopes in 600 samples of rock taken from many different locations around the world..."

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Guest post: Why CO2 removal is not equal and opposite to reducing emissions Carbon Brief

"...This can be achieved by enhancing natural carbon “sinks” that remove CO2 from the atmosphere – for example, by planting trees or restoring peatlands and mangrove forests. Other ways to remove CO2 from the atmosphere include capturing CO2 from bioenergy plants or engineered methods that capture CO2 directly from the atmosphere and store it underground or in products..."

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Historical climate effects of permafrost peatland surprise researchers

"...Peatlands are an important ecosystem that contribute to the regulation of the atmospheric carbon cycle. A multidisciplinary group of researchers, led by the University of Helsinki, investigated the climate response of a permafrost peatland located in Russia during the past 3,000 years. Unexpectedly, the group found that a cool climate period, which resulted in the formation of permafrost in northern peatlands, had a positive, or warming, effect on the climate..."

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Canada’s thawing permafrost should be raising alarm bells in the battle against climate change

"...When it comes to climate change, scientists pay particular attention to positive feedbacks involving Earth’s carbon cycle. In these cases, emissions of carbon from human behaviour cause warming, that in turn stimulates release of carbon from non-human sources, which leads to more warming. For example, as the planet’s surface temperatures have shot upward over the past decade, wildfires from Australia to British Columbia to Siberia have released staggering quantities of carbon, enough to appreciably boost levels of heat-trapping carbon dioxide in the atmosphere..."

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Extreme CO2 greenhouse effect heated up the young Earth

"...A much-debated question in earth science concerns the temperatures of the early oceans. There is evidence that they were very hot. Measurements of oxygen isotopes on very old limestone or siliceous rocks, which serve as geothermometers, indicate seawater temperatures above 70°C..."

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Newly discovered enzymes are not heavy metal fans

"...Researchers at Tsukuba University discover a new group of carbonic anhydrase enzymes that do not require any metal ions for their activity, which improves our knowledge of the global carbon cycle and may be applicable to artificial photosynthesis..."

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African rainforests still slowed climate change despite record heat and drought

"...Professor Lewis said: "These findings show the value of careful long-term monitoring of tropical forests. The baseline data running back to the 1980s allowed us to evaluate how well these rainforests coped with record heat and drought. " Past evidence from similar inventory networks in Amazonia studying major droughts in 2005 and 2010, and in Asia studying the large 1997-1998 El Niño event, show either substantially slower tree growth or much greater tree mortality in response to extreme drought and heat..."

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Carbon emissions from dams considerably underestimated so far

"...Among other things, dams serve as reservoirs for drinking water, agricultural irrigation, or the operation of hydropower plants. Until now, it had been assumed that dams act as net carbon stores. Researchers from the Helmholtz Centre of Environmental Research (UFZ) together with Spanish scientists from the Catalan Institute for Water Research (ICRA) in Girona and the University of Barcelona showed that dams release twice as much carbon as they store..."

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Strange isotopes: Scientists explain a methane isotope paradox of the seafloor

"...This process takes place globally in the seafloor and hence is an important part of the carbon cycle. However, studying the AOM process is challenging because the reaction is very slow. For its investigation, researchers often use a chemical knack: the stable isotope ratios in methane..."

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Pyrosomes: Enigmatic marine inhabitants with an important role in the Cabo Verde ecosystem

"...Pyrosomes, named after the Greek words for 'fire bodies' due their bright bioluminescence, are pelagic tunicates that spend their entire lives swimming in the open ocean. They are made up of many smaller animals, known as zooids, that sit together in a tubular matrix, known as tunic (hence the name pelagic tunicates). Because they live in the open ocean, they generally go unnoticed..."

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Recommended Reading

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Podcasts

Recent episodes that mention carbon cycle.

Scott Denning: Semester at Sea | The Global Carbon Cycle | From Geology to Atmospheric Science

Duration: 2:23:11

"...Professor Scott Denning from the Department of Atmospheric Science at Colorado State University joins me to talk about his semester teaching at sea, his research career working on the global carbon cycle (especially the atmospheric and land portions), and his pathway from geology into atmospheric science..."

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Anna Harper: the Land Carbon Cycle

Duration: 1:58:11

"...Lecturer Anna Harper on vegetation, climate change, and her pathway into science..."

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Corinne Le Quéré on the global carbon cycle

Duration: 27:00

"...Throughout the history of planet Earth, the element carbon has cycled between the atmosphere, the oceans and the biosphere..."

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Corinne Le Quéré on the global carbon cycle

Duration: 27:49

"...Throughout the history of planet Earth, the element carbon has cycled between the atmosphere, the oceans and the biosphere..."

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Informative Video

Discussions, Documentaries, and Investigative Reports about carbon cycle.

The Hydrologic and Carbon Cycles: Always Recycle! - Crash Course Ecology #8

"...The hydrologic cycle describes how water moves on, above, and below the surface of the Earth, driven by energy supplied by the sun and wind..."

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Forest Degradation — Mathias Disney / Serious Science

"...There's an ecosystem service to us selfishly but to all other organisms that depend on them, so there's been a lot of work again in trying to understand how we can map degradation rather than just purely deforestation. ' ..."

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Academic Research

Recent peer-reviewed papers about carbon cycle relevant to the latest news.

Greenhouse Gases Emissions in Agricultural Systems and Climate Change Effects in sub-Saharan Africa

"...A key cause of global warming is the increase in greenhouse gas emissions including methane, nitrous oxide, and carbon among others..."

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Carbon Footprint of Karnataka: Accounting of Sources and Sinks

"...The forests ecosystems account for ~82% of the continental biomass, a source for higher terrestrial carbon sequestration, playing a vital role in maintaining the carbon cycle and provision of various goods and services, which play a primary role in human?s socioeconomic development..."

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Increasing climate sensitivity of subtropical conifers along an aridity gradient

"...Subtropical forests are an important but still poorly understood component of the global carbon cycle and global biodiversity..."

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Records of volcanism and organic carbon isotopic composition (δ13Corg) linked to changes in atmospheric pCO2 and climate during

"...Results suggest volcanism to be a significant driver for late Pennsylvanian to earliest Cisuralian shifts in global climates from glacial to interglacial through greenhouse gas emissions and changes to the global carbon cycle..."

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Beyond trees: Mapping total aboveground biomass density in the Brazilian savanna using high-density UAV-lidar data

"...However, their ability to store and sequester carbon is uncertain due to combined and intermingling effects of anthropogenic activities and climate change, which impact wildfire regimes and vegetation dynamics..."

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Theoretical Insight on Highly Efficient Electrocatalytic CO2 Reduction Reaction of Monoatom Dispersion Catalyst (Metal-Nitrogen

"...The research points out that M-N-C (M?=?Ir) catalysts have good performance in catalyzing the reduction of carbon dioxide into carbon products with economic value, especially methane and methanol, and multicarbon products such as ethanol..."

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Effect of land cover change on total SOC and soil PhytOC accumulation in the karst subtropical forest ecosystem, SW China

"...Conclusions The results of the present study provided scientific bases for further evaluating the carbon sink capacity of soil PhytOC in the karst ecosystem, in SW China, and have important values in the reduction of carbon emission and increase of carbon sink to combat the global warming..."

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Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass

"...Seagrass ecosystems are globally-significant ?blue carbon? sinks; however, there is concern that this capacity will decline if rising ocean temperatures accelerate microbial decomposition..."

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Valorization of Waste Biomass in Fermentative Production of Cellulases: A Review

"...The most promising way to achieve the smooth, flexible and sustainable bioeconomy is the utilization of renewable lignocellulosic biomass as a feedstock for the production of fuels, chemicals, enzymes and high-valued products..."

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Effects of livestock on nitrogen and carbon cycling in a savanna in Burkina Faso

"...Therefore, our hypothesis that grazing would increase soil 13C and 15N values and plant biomass was only verified for grass 15N..."

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Comparison of tree-ring growth and eddy covariance-based ecosystem productivities in three different-aged pine plantation fores

"...Key message This study utilized dendrochronology and long-term (2003?2017) eddy covariance (EC) carbon flux data to investigate the relationships between tree growth and gross ecosystem productivity (GEPEC) in different-age (15-, 42- and 78-year old) pine plantation forests in the Great Lakes region in eastern North America and found that tree-ring growth in these different-age pine forests was significantly (p?<?0..."

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Carbon stock and sink economic values of forest ecosystem in the forest industry region of Heilongjiang Province, China

"...The values of forest carbon stock (CSV) and carbon sink (COV) are important topics in the global carbon cycle..."

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