Related Experiment Video
Updated: Sep 14, 2025
07:32
Monitoring Pedogenic Inorganic Carbon Accumulation Due to Weathering of Amended Silicate Minerals in Agricultural Soils.
Published on: June 4, 2021
5.3K
Reduction in Earth's carbon budget imbalance.
Sudhanshu Pandey1, Frédéric Chevallier2, Christian Rödenbeck3
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. sudhanshu.pandey@jpl.nasa.gov.
Nature Communications
|July 24, 2025
Summary
The Global Carbon Project (GCP) has reduced its global carbon budget imbalance by 37% through improved models and data. This indicates significant progress in understanding Earth's carbon cycle and more accurate carbon sink estimates.
Area of Science:
- Earth System Science
- Climate Science
- Carbon Cycle Research
Background:
- The Global Carbon Project (GCP) annually synthesizes estimates of anthropogenic CO2 emissions, land and ocean sinks, and atmospheric CO2 growth rate.
- The global carbon budget imbalance highlights aggregate inaccuracies in these component estimates.
- Marine boundary layer (MBL) growth rate estimates are considered highly accurate, with land and ocean sink models often cited as primary sources of imbalance.
Purpose of the Study:
- To investigate discrepancies arising from using MBL growth rates to represent the entire atmosphere.
- To quantify the reduction in the global carbon budget imbalance through corrections and model improvements.
- To assess the overall improvement in the scientific understanding of Earth's carbon cycle.
Main Methods:
- Correcting MBL growth rate estimates for whole-atmosphere representation using atmospheric flux inversion.
- Analyzing the global carbon budget imbalance metric between the 2017 and 2023 GCP reports.
- Evaluating the impact of updates to carbon budget components, forcing data, and new carbon cycle processes.
Main Results:
- Correcting for MBL discrepancies reduced the 2023 GCP report's root-mean-square (RMS) imbalance by up to 25%.
- Between 2017 and 2023, overall imbalance decreased by 16% due to component updates and process improvements.
- A combined 37% reduction in RMS imbalance (from 0.91 to 0.57 PgC yr-1) was achieved through model enhancements and atmospheric growth rate corrections.
Conclusions:
- Land and ocean process models are more accurate than previously assumed.
- Improvements in process models and emission inventories are quantitatively demonstrated.
- Scientific understanding of Earth's carbon cycle has significantly advanced.
Related Concept Videos
01:14The Carbon Cycle
39.9K
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
39.9K
01:50Global Climate Change
24.8K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.8K
01:28Carbon-dioxide Fixation
86
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
86
01:46The Calvin Benson Cycle
4.7K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.7K
02:23Alcohols from Carbonyl Compounds: Reduction
10.8K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
10.8K
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
2.3K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.3K