Questions tagged [carbon-cycle]
The carbon-cycle tag has no usage guidance.
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0answers
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Could we plant enough trees to offset greenhouse gas emissions? [duplicate]
In 2014, the world emitted 10 billion metric tonnes of carbon dioxide. A 50 year old oak tree forest sequesters 30,000 pounds of CO2 per acre. At that rate of sequestration per acre, offsetting all ...
2
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1answer
41 views
Effect of reducing conditions on melting point
I've been reading a paper(*) looking at the deep carbon cycle and it mentions a key process that the authors refer to as "redox melting". According to the paper, reducing conditions increase the ...
4
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1answer
72 views
What caused the Carbon Dioxide Variations observed in the 800,000-year polar ice record?
I have seen several graphs showing the prehistoric temperatures and CO2 concentrations derived from ice-core data. My understanding is that CO2 and temperature correlate. I assume that Milankovich ...
3
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1answer
48 views
Will photosynthesis based carbon sequestration always be more efficient than other chemical means - in terms of rate?
There seem to be many ideas for carbon sequestration. The problem with anything electrochemical, is that unless it is solar-based, you're putting carbon into the atmosphere at probably a great rate ...
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3answers
243 views
Did climate cool down when underground hydrocarbons stocks formed?
As far as I understand, the dominant theory of modern climate change says that recent warming is mainly caused by the massive burning of hydrocarbons that used to be stored in solid form mostly ...
6
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3answers
3k views
Does organic decay release the same CO2 as burning?
Does a fallen tree left to decay release essentially all of its stored carbon as CO2 to the atmosphere? Or is the carbon uptaken by termites and bacteria, preventing its release to the atmosphere?
6
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1answer
301 views
Estimating the residence time of atmospheric CO2 from bomb 14C
This (rather dodgy) graph shows a number of estimates of the residence time of atmospheric CO2:
My question concerns why there is so much variation (Machta, 1974 about 3 years, Seuss and Druffe, 1983 ...
-6
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2answers
333 views
Why cannot people burn all the atmospheric oxygen? [closed]
We are told that photosynthesis, developed a couple of billion years ago has produced all the atmospheric oxygen. I wonder, why did the process stop? Why do modern plants prefer to recover the entropy ...
4
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1answer
163 views
Is it possible that a reduction in vegetation is a cause of global warming?
A lot of people seem to believe that the entire cause of global warming is that humans are emitting lots of carbon dioxide. However, according to a source I found online (I accept it may not be ...
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0answers
59 views
Locate people by Oxygen/Carbon Dioxide levels [closed]
I've been challenged to think of some really out-of-the-box ways to locate people, and I had one. I'm 90% sure this isn't reasonably possible (probably only in laboratory settings), but I couldn't ...
5
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2answers
258 views
How did plants adapt to $\small\sf{CO_2}$ levels past 400k years? Why won't they do it again?
(Description from climate.nasa.gov: This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric $\small\sf{...
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4answers
706 views
Are all natural diamonds made of organic carbon material?
I've read that diamonds are created at a depth of about 180 km. By volcanic activity it comes above. But did plants and trees of 300 million years ago sink so deep? Or is it possible that inorganic ...
3
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1answer
206 views
What is the distribution of global photosynthesis?
Has anyone attempted to classify global photosynthesis? For example, what percentage of it occurs over land? What percentage comes from agriculture?
Same questions for total growth of plant mass.
...
6
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1answer
111 views
What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)?
A commenter made the following reflection:
Ocean acidification is different than sea level rise and global warming, however. With ocean acidification, we're making an excursion unlike anything the ...
5
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4answers
2k views
Why has CO2 decreased in the history of the Earth?
I noticed that the $\ce{CO2}$ is actually decreasing in the eon time.
My guess is lush vegetation or forests began to grow which absorbed the $\ce{CO2}$ by photosynthesis? Would anyone give me any ...
3
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2answers
8k views
What is the difference between a carbon sink and a carbon reservoir?
I am trying to figure out the difference between a carbon sink and a carbon reservoir.
The definition for a carbon sink from wikipedia is that “carbon sink is a natural or artificial reservoir that ...
4
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1answer
101 views
Timescale of the biological pump？
I'm tying to find any clue about the timescale of the biological pump. That the carbon is recycled to the surface ca. 1,000 years is clear but the timescale of the biological pump seems hard to find. ...
10
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4answers
760 views
Why do we recycle paper?
Recycling metal and some plastics makes complete sense to me. Why bury something in a landfill that you'll have to find and dig up more of later. What I don't get is why we recycle paper products, ...
6
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2answers
124 views
Sources of $\ce{CO_2}$ during Carboniferous period
It is believed that during the Carboniferous period, fungi and bacteria lacked the biochemical means to decompose lignin and release $\ce{CO_2}$ back to the atmosphere. So dying trees carbon became ...
10
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1answer
181 views
Hypotheses about Silurian carbon isotope excursions?
The Silurian Period is now known to have undergone several significant positive $\delta^{13}C_{carb}$ excursions, namely the early Aeronian, Late Aeronian, Valgu, Ireviken, Mulde, Lau & Klonk ...
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1answer
594 views
How is carbon distributed among the atmosphere, the oceans, the biomass and the unburnt fossil fuels?
In relation to my other question about carbon cycle and climate change, i would like to know some estimates of the carbon distribution among the atmosphere, the oceans, the biomass and the unburnt ...
10
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2answers
753 views
To stop anthropogenic climate change, is it necessary to stop extracting petroleum and start pumping carbon under ground?
The amount of carbon (C) on Earth is constants. As far as i understand, all carbon that is not found in the atmosphere or the oceans in the form of CO2 or CO is stored either in the biomass (plants, ...
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4answers
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How many trees would I have to plant to solve Global Warming?
According to Nasa, causes of the Earth's greenhouse effect include water vapor, carbon dioxide, methane, nitrous oxide, and CFCs. Carbon dioxide gets the most press, and NASA's page says:
Carbon ...
13
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1answer
104 views
Does the heating of the oceans due to greenhouse effect negate the acidification due to increased CO2 levels?
As I understand, the dissolving of carbon dioxide leads to increased acidification of the oceans, and thus increased atmospheric CO2 levels would lead to more dissolution in the oceans and thus ...
11
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1answer
110 views
Estimate litter production
How would one go about estimating litter production (fine root turnover, leaves, etc.) for a forested area? I have some estimates from literature - which were derived from models, but I'd like to ...
28
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1answer
2k views
What is the status of the Raymo & Ruddiman idea that Tibet cooled the Earth?
What is the current status of the Raymo & Ruddiman hypothesis that the uplift of the Tibetan Plateau during the Cenozoic cooled the Earth, resulting the current ice age(*)?
cf. Raymo, M.E. and W....
5
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1answer
51 views
Do river fluxes help contribute to long-term carbon sequestration?
Rivers help transport sediment from higher regions into the oceans (where it's hard to get back into the atmosphere).
And this sediment could be carbon-rich.
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5answers
425 views
Does vegetation contribute to long-term carbon sequestration?
So we know that vegetation sequesters carbon dioxide into its leaves. Much of this carbon sequestration is temporary, since when the plant dies, much of it is released as CO2 back into the atmosphere. ...
11
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3answers
2k views
How were we able to measure carbon dioxide levels in earlier climates?
It is said that carbon dioxide levels were much higher during the Cretaceous and Eocene periods: which proxies are used to determine paleo-pCO2?
8
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1answer
140 views
How much carbon is sequestered out of the atmosphere through marine snow?
Marine snow in the deep ocean is a continuous shower of mostly organic detritus falling from the upper layers of the water column. How much carbon is sequestered in this process? How does it compare ...
