One Year of Global Warming Reports by MG,Jr

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One Year of Global Warming Reports by MG,Jr

Over the last year, I have posted a series of reports on global warming climate change that address it in a quantitative physics, rather than qualitative and sociological manner. Those reports are listed below in chronological order. My estimation of what global warming “will look like” in the immediate and longer term future was refined over the course of producing these reports; but they are all of-a-piece on the topic.

The first report is primarily “data” for subsequent calculations (and very important). The two PDF reports are my mathematical physics notes on my calculations (the first of these being most significant). The other five are applications of the numerical results for descriptive purposes — to help the general reader understand the magnitude and duration of the global warming effect.

A number of these reports found their way onto Internet Magazines, most significantly Counterpunch, and Green Social Thought.

The versions on my blog have had minor numerical and/or typographical errors corrected (as I find them), and are followed by my comments of subsequent thoughts, with more physics on them just after they were posted.

My sociological recommendations about “what to do about climate change” are summarized in one brief paragraph at the end of Biosphere Warming in Numbers.

My purpose in doing this work should be obvious; first, for me to understand, quantitatively, the nature of global warming; and, secondly, to help “you” to understand it.

I welcome comments and questions on the topic; after all it was such inquiries that prompted me to look into this topic (scientifically) more deeply in the first place.

Please also note, I do NOT dispute the work of professional geophysics/climate change scientists, who work at climate change institutes of various kinds around the world (e.g., meteorological, geological, atmospheric physics and chemistry, oceanographic, biological/ecological/evolutionary sciences), and who use banks of supercomputers to model the many complexities of global warming and climate change (with numerous such complexities still beyond current science’s grasp).

Ye Cannot Swerve Me: Moby-Dick and Climate Change
15 July 2019
https://manuelgarciajr.com/2019/07/15/ye-cannot-swerve-me-moby-dick-and-climate-change/

A Simple Model of Global Warming
26 May 2020
https://manuelgarciajr.files.wordpress.com/2020/05/global-warming-model.pdf

Global Warming is Nuclear War
28 May 2020
https://manuelgarciajr.com/2020/05/28/global-warming-is-nuclear-war/

Living With Global Warming
13 June 2020
https://manuelgarciajr.com/2020/06/13/living-with-global-warming/

No emissions with exponential decay of CO2 concentration: Model
18 June 2020
https://manuelgarciajr.files.wordpress.com/2020/06/global-warming-co2-shutoff.pdf

Global Warming and Cooling After CO2 Shutoff at +1.5°C
20 June 2020
https://manuelgarciajr.com/2020/06/20/global-warming-and-cooling-after-co2-shutoff-at-1-5c/

Biosphere Warming in Numbers
3 July 2020
https://manuelgarciajr.com/2020/07/03/biosphere-warming-in-numbers/

Carbon Dioxide Uptake by Vegetation After Emissions Shutoff “Now”
8 July 2020
https://manuelgarciajr.com/2020/07/08/carbon-dioxide-uptake-by-vegetation-after-emissions-shutoff-now/

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ALSO:

Global Warming and Ocean Acidification Accelerate
18 July2020
https://manuelgarciajr.com/2020/07/18/global-warming-and-ocean-acidification-accelerate/

Ocean Heat, From the Tropics to the Poles
1 August 2020
https://manuelgarciajr.com/2020/08/01/ocean-heat-from-the-tropics-to-the-poles/

The Improbability of CO2 Removal from the Atmosphere
9 August 2020
https://manuelgarciajr.com/2020/08/09/the-improbability-of-co2-removal-from-the-atmosphere/

ClimateSIM Junior, Simplified Prognostication from Unrealistic Hypothesis
16 August 2020
https://manuelgarciajr.com/2020/08/16/climatesim-junior-simplified-prognostication-from-unrealistic-hypothesis/

Facing Extinction, My View
2 September 2020
https://manuelgarciajr.com/2020/09/02/facing-extinction-my-view/

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Possible Future Trends of CO2 Concentration and Global Temperature
7 September 2020 (revised 9 September 2020)
https://manuelgarciajr.com/2020/09/07/possible-future-trends-of-co2-concentration-and-global-temperature/

The above (a brief summary) includes a web-link to the big report below.

A Rate Equation for Accumulation or Loss of Atmospheric CO2
5 September 2020 (revised 9 September 2020)
https://manuelgarciajr.files.wordpress.com/2020/09/rate-equation-for-atmospheric-co2-revised.pdf

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Major improvement on the above

Anthropogenic CO2 Emissions Are Fate
12 September 2020
https://manuelgarciajr.com/2020/09/12/anthropogenic-co2-emissions-are-fate/

For those interested in the technicalities, see

A Carbon Balance Model of Atmospheric CO2
11 September 2020
https://manuelgarciajr.files.wordpress.com/2020/09/a-carbon-balance-model-of-atmospheric-co2.pdf

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Reducing CO2 Emissions to Reverse Global Warming
17 September 2020
https://manuelgarciajr.com/2020/09/17/reducing-co2-emissions-to-reverse-global-warming/

Global Warming Burps, Bubbles, Simmers and Sours On
24 September 2020
https://www.counterpunch.org/2020/09/24/global-warming-burps-bubbles-simmers-and-sours-on/

Another Model of Atmospheric CO2 Accumulation
5 October 2020
https://manuelgarciajr.com/2020/10/05/another-model-of-atmospheric-co2-accumulation/

The CO2 and Temperature of the PETM
2 November 2020
https://manuelgarciajr.com/2020/11/02/the-co2-and-temperature-of-the-petm/

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Global Warming and Cooling After CO2 Shutoff at +1.5°C

I have done further analytical modeling of global warming, using the same general method described earlier (https://manuelgarciajr.files.wordpress.com/2020/05/global-warming-model.pdf).

The question addressed now is: what is the trend of temperature change after an abrupt shutoff of all CO2 emissions just as the net temperature rise (relative to year 1910) reaches +1.5°C, given the lifetime of CO2 in the atmosphere?

For this problem, it is assumed that when the temperature rise (relative to 1910) reaches ~+1.5°C, that:

– all greenhouse gas emissions cease;

– pollution grit (which scatters light) falls out of the atmosphere “instantly” (a few weeks);

– CO2 (greenhouse gas) concentration decays exponentially after emissions shutoff;

– for CO2 lifetimes [e^-1] in years: 20, 50, 100, 238.436, 500, 1,000, 10,000, 100,000;

– temperature sensitivities of cloud cover, ice cover and albedo are as in the previous model;

– all other fixed physical parameters are as in the previous model,
(https://manuelgarciajr.com/2020/06/13/living-with-global-warming/).

In general, for the 8 cases calculated, the temperature increases at a diminishing rate after the emissions shutoff, reaches a peak, then trends downward.

The longer the lifetime of carbon dioxide in the atmosphere, the later and higher is the temperature peak, and the longer it takes to cool back down to the baseline temperature of 1910, which is 1.5°C below the starting temperature for this problem.

The 4 figures below show the calculated results.


Figure 1: °C change vs. years after shutoff, for lifetimes: 20, 50, 100, 238.436 years.


Figure 2: °C change vs. years after shutoff, for lifetimes: 20, 50, 100, 238.436, 500, 1,000 years.


Figure 3: °C change vs. years after shutoff, for lifetimes: 238.436, 500, 1,000, 10,000 years.


Figure 4: °C change vs. years after shutoff, for lifetimes: 1,000, 10,000, 100,000 years.

It is evident from the figures that if the lifetime of carbon dioxide in the atmosphere is greater than 500 years, that a temperature overshoot above +2.0°C (relative to 1910) will occur before cooling begins.

If the lifetime of carbon dioxide in the atmosphere is greater than about 250 years, it will take over a century for the eventual cooling to reduce average global temperature to its baseline temperature (which is for 1910 in this model).

If the lifetime of carbon dioxide in the atmosphere is greater than 10,000 years, the temperature overshoot will take global warming past +4.0°C (above our 1910 datum) for hundreds to thousands of years, and cooling back down to the temperature at our datum would take millennia.

The clearing of carbon dioxide from the atmosphere is a slow process. The absorption of CO2 by the oceans, and the subsequent dissolution of seafloor sediments (acidifying the oceans) occur over decades to centuries. The uptake of carbon dioxide by weathering reactions in carbonate and silicate soils and rocks occurs over millennia to many tens of millennia.

It took about 200,000 years to clear away the CO2 that caused the +8°C to +12°C global warming spike that occurred 55.5 million years ago, which is known as the Paleocene-Eocene Thermal Maximum (PETM).

Beyond its intrinsic scientific interest, this study confirms what has long been known as the needed remedy: anthropogenic emissions of greenhouse gases must permanently cease as soon as possible in order to limit the ultimate extent and duration of unhealthy global warming.

My notes on the mathematical solution of this problem are available through the following link

Global Warming, CO2 Shutoff

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Climate System Response Time

The parameter “beta” is a reaction rate, or frequency, or inverse response time of the biosphere and its climate system. By my calculation, that rate is 1.329×10^-10 seconds^-1, or 0.004194 years^-1, or a response time of 238.436 years. Of course I am not saying the precision of this estimate is as suggested by all the decimal places shown, it’s just that these are the numbers that come out of my calculations, and these numbers are kept to remind me of what choices I made to eventually arrive at this result.

The parameter beta is the product:

beta = (S•a1)/C = [S•(a-cloud – a-ice)]/C,

where:

S = the insolation on the entire disc area of the Earth (1.7751×10^17 Watts),

a-cloud = the temperature sensitivity of the albedo because of the extent of cloud cover (1/°C),
for a positive quantity of: increase of albedo for a given temperature rise (5.715×10^-3 1/°C),

a-ice = the temperature sensitivity of the albedo because of the extent of ice cover (1/°C),
for a negative quantity of: decrease of albedo for a given temperature rise (1.429×10^-3 1/°C),

C = the heat capacity of the biosphere (5.725×10^24 Joules/°C).

A better determination of a-cloud and a-ice would improve the estimate of beta. I chose these quantities to be in the ratio of 4:1, as is the ratio between the cloud reflection portion of the albedo (24%) to the Earth surface portion of the albedo (6%) for the total pristine (pollution free, pre-global warming) albedo (30%).

So, beta incorporates physical parameters that characterize: solar energy, atmospheric and Earth surface reflectivity of light, and the thermodynamics of the mass of the biosphere.

Events and inputs to that Earth climate system are recognized and responded to on a timescale of 1/beta. Events and inputs with timescales less than 1/beta are blips whose impact will become evident much later, if they are of sufficient magnitude and force. Events and inputs of timescales longer than 1/beta are “current events” to the biosphere’s thermodynamic “consciousness,” and act on the climate system as it reciprocally acts on them over the course of the input activity.

Turning a large ship around takes advanced planning and much space because it’s large inertia tends to keep it on its original heading despite new changes to the angle of its rudder. Even more-so, changes in the direction of Earth’s climate, which may be sought with new anthropogenic rudder angel changes — like drastic reductions of greenhouse gas emissions — will require fairly deep time because of the immense thermodynamic inertia of that planetary system.

This means that the climate system today is responding to the “short time” impulses it was given over the previous two centuries or more; and that both the more enlightened and most stupid impulses that we give it today could take several human lifetimes to realize their full response. We are dealing with Immensity here, and our best approach would be one of respect and commitment.

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