Questions tagged [climate-change]

Questions about changes of the climate system, including questions about global warming.

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1answer
93 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 ...
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1answer
132 views

Polar melting and the equator

As the polar ice caps disappear, the equatorial regions must take the bulk of extra water due to the earth's spin. My question is will the tilt of the earth be affected and what would be the ...
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1answer
119 views

Understood cause of sea level rise between 1850 and 1950

This question is based on the following graph from a 2018 report by J. Curry. (I haven't found any peer-review of the report itself so I can't vouch for the validity of its claims, but that's not the ...
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1answer
74 views

Which CMIP5 models give the highest and lowest warming for RCP8.5?

Question is in the title. I'm doing impacts research and need to pick a couple of scenarios before downloading GCM runs. Want to pick a low one and a high one and one in the middle of the road. I'm ...
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2answers
419 views

What are the formulae for calculating the thermal heating effect of back radiation in greenhouse gases?

The ability of greenhouse gases to trap heat and re-radiate some of it back to the original heat source looks like a useful thermal property which could possibly be incorporated in things like double ...
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62 views

How are CO2 emission effects and high altitude effects of air travel compared to each other?

The climate impact of air travel is often divided into CO2 emissions and "high altitude effects" like that of water vapour and cloud formation. The effect of the emitted CO2 is cummulative, as CO2 has ...
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1answer
82 views

Is there consensus amongst climatologists that cold weather extremes are caused by global warming or human influence?

Is there consensus amongst climatologists that cold weather extremes are caused by global warming or human influence? I hear the claim a lot that the recent cold weather extremes (such as the polar ...
4
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1answer
81 views

Status of overdue glaciation hypothesis

What is the status of the Early Anthropocene hypothesis, in the specific meaning that the climate would be projected to be significantly cooler (such as, on the order of by 0.8 degrees in the planet ...
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1answer
283 views

How does the lifetime of methane vary in the atmosphere?

When reading about methane and its effect on climate, it is clear that its lifetime in the atmosphere is important to the global warming potential. However, the lifetime does vary from 9 to 15 years, ...
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84 views

How temperature anomaly are measured

Temperature Anomaly is the measure used to show that the earth is warming. The formula for temperature anomaly involves in the subtraction of average temperature measurement over 30 years considered ...
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77 views

Do man-made machines take natural Nitrogen out of the atmosphere and in turn cause global warming?

I read in Wikipedia that, "Natural Nitrogen, Dinitrogen forms about 78% of Earth's atmosphere. Dinitrogen is the most abundant uncombined element in the atmosphere." Do man-made machines destroy the ...
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51 views

How is the vertical distribution of water vapor changing?

In this publication about data assimilation and observations (paywall alert) in the chapter General Concepts in Meteorology and Dynamics (by Andrew Charlton-Perez, William Lahoz, Richard Swinbank, ...
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144 views

How to relate RCM/GCM RCP climate projections to observational data for use in a hydrologic model

As a (smaller) part of my research, I want to look at climate projection data and how that might influence the hydrology within a study catchment in Rajasthan, India. For "the present day" climate, I ...
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50 views

How well do past climate models stick to current observations? [duplicate]

I'm wondering how good the climate models of the recent past have been at predicting the current climate. Notably, I've heard quite a few times that the temperature was increasing faster than the ...
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74 views

How to do frequency analysis of an index when some years have zero value?

I want to do frequency analysis of drought severity, but unlike precipitation data here I have few zero values in some of the years. how to do this? Here is the sample data: ...
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4answers
4k views

Looking for evidence against some points raised in Ivar Giaever's speech on climate change

I just listened to Ivar Giaever's speech on the climate change, and he raised following points which seem significant to me: Temperature differences y/y are very small compared to natural variation ...
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3answers
855 views

Regarding the melting glaciers and icebergs, why isn't the extra water vapor in the atmosphere mentioned in discussions of global warming?

As is reported on the major news networks, many glaciers and big icebergs are melting, which reportedly causes a tremendous increase in the amount of water vapor in the atmosphere. Now a lot of ...
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1answer
240 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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4answers
125 views

Total CO2 is not constant?

I've got a friend who is a climate change sceptic. He argues that because all the CO2 in fossil fuels originally came from the earth's atmosphere. Then there can't be a problem releasing the CO2 ...
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248 views

How Can Smog in Metropolitan Cities like Delhi & Beijing Be Reduced?

These two cities are facing the worst smog in Asia and I think in the world and people of these cities have no choice other than to wear masks when going outside. ...
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3answers
172 views

Is everything affecting everything on Earth?

If a single butterfly can alter the future, then can't every single action keep the future in chaos? According to the question about butterfly effects, this must be so, is it not? If this is an ...
3
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1answer
162 views

Are we going to enter a mini ice age in the next decade?

According to this article, a mini ice age could hit Earth by 2030 Mini Ice Age could hit Earth by 2030 and according to this video NASA admits mini ice age coming faster than anticipated. ...
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327 views

The atmosphere and the dispersion of greenhouse gases

I have been researching everywhere. At what level of the atmosphere do carbon dioxide and other greenhouse gases occur? I can't get a straight answer and am frustrated...
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546 views

Climate change hoax [closed]

I see many scientific articles and newspapers out there saying that the climate change is happening. Yet, there are people who believe climate change is a hoax and a lie. But I haven't seen any '...
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2answers
152 views

Implications of recent 36 degrees Fahrenheit (20C) anomaly at North Pole?

This extreme difference from normal -- could it occur in climates that are warmer, making some places unlivable? Additionally, is there a reason why extremely cold places should expect to have ...
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76 views

3 Billion years ago, the earth is covered with Carbon Dioxide. Where did it go?

Oxygen gas began to appear on the earth surface about 2 billion years ago by photosynthesis. Carbon Dioxide was converted into carbohydrates in the process. Where did these carbohydrates go? If they ...
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161 views

Why doesn't Earth absorb our carbon emissions?

If we look at the carbon cycle, we see that man-made carbon emission only account for a tiny fraction of all $\text{CO}_2$ emissions. However, we see a steady rise in atmospheric $\text{CO}_2$-levels....
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326 views

Does global warming affect tsunamis?

I have been doing some research into global warming, and I was curious as to whether or not increasing the temperature of the oceans would affect tsunamis to any significant degree. My gut tells me ...
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1answer
187 views

Making sense of the math of climate change

Let me state upfront, I'm not arguing the existence of climate change, just trying to clarify my own understanding of something that doesn't make sense to me yet. With apologies for the layman's ...
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3answers
190 views

Had the climatologists predicted climate change as the deviations to both extremely cold and hot temperatures before?

Recently I read that the current extreme snowfall in northern temperate climate is caused by the increased evaporation due to the global warming. Had any scientist predicted these extremes before ...
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1answer
84 views

What is meant by Global-warming Potential (GWP)?

I was under the impression GWP (global-warming potential) is the measure of a gas' impact on global warming, in comparison with CO2. E.g. methane has a GWP of 86 over 20 years - Wikipedia Comparing ...
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82 views

Is there scientific evidence connecting the current climate in India with global warming?

Experts say up to 40 % of India might witness drought this year. Is there scientific evidence that this is due to the global warming and climate changes?
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91 views

Is it possible to create ice in poles? [closed]

Is it possible that human can built under the poles a controlled system to create again artificial icebergs? In order keep tight the melting ice and reduce the sea level? Can this system impact the ...
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63 views

Were there any plans or proposals for “unilateral geoengineering deployments” before this paper was publsihed?

I saw the catchy Phys.org news title Artificially cooling planet 'risky strategy,' new research shows and then looked at the open access article, in Nature Communications (14-Nov-2017 online) Impacts ...
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97 views

Is evapotransporation accounted for in climate models?

Is evapotransporation accounted for in climate models, or is it considered so insignificant that it's not considered? Could additional crops being planted within the last 100 to 50 years account ...
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1answer
224 views

UAH and RSS Lower Troposphere data

The UAH 6.0 and RSS lower troposphere data sets line up nearly perfectly and both show no significant warming for over 20 years. What is the leading theory for what's going on? What explains this?
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213 views

How much reduction of insolation (solar energy) would be required to stop global warming?

Suppose a giant sheet of semi-reflective mylar (or some other kind of partial sun-screening material) was temporarily placed into space between the Earth and the Sun with the intent to lower the ...
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1answer
71 views

What happens when the North and South poles flip?

How long does it take the magnetic field to move once the poles start to flip? What environmentally would change? Does the core of the Earth flip? The magnetic poles are moving now. When will it ...
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1answer
74 views

Equations for Milankovitch Factors?

Are there equations for the radiative forcings of the three Milankovitch factors at any given time? Or a database of values?
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1answer
91 views

CMIP5 multi-model ensemble, can it be shown as ensemble average?

Let’s say I have got 15 CMIP5 models’ outputs of a given variable e.g. temperature, for RCP6.5 (2020-2100) run. I want to plot how the temperature will change in the future 2020-2100 (scatter plot, x ...
3
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1answer
120 views

Calculating 30% less solar energy. Provided the math is right, would there have been liquid water on Earth?

The Sun is estimated to have had a solar luminosity about 30% lower when the solar system was formed. Now if I assumed that Earth's albedo was the same as it is today, what ...
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2answers
158 views

Current temperature increase VS decrease during the little ice age

Looking at the following temperature reconstructions i have two questions (source: wikipedia): Why is the y-axis centered around -0.2 °C? Why are the consequences of the current temperature ...
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1answer
99 views

How much energy would be required to actively reduce the temperature of the oceans of Earth by 1℃?

Is there a way to calculate the energy required to reduce the heat of oceans? Am I wrong in thinking it is not as simple as reversing the calculation for specific heat of sea water?
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68 views

How would this experiment's different particle types produce atmospheric reflectivity?

The MIT Technology Review news item Harvard Scientists Moving Ahead on Plans for Atmospheric Geoengineering Experiments discusses a proposed experiment to study in a carefully controlled way the ...
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1answer
106 views

Educational book on science of climate change with action items?

I originally posted this over on Sustainability.SE and someone suggested I try asking over here. Can anyone recommend a book or books, intended for a non-scientific audience, which covers some (or ...
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3answers
225 views

Relative world carbon footprints by nation?

Are there studies showing the relative positions carbon footprints of various countries? which one produce how much greenhouse gases? I'm interested in comparing developing and developed countries ...
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1answer
117 views

Which greenhouse gas has the most influence over global warming?

Carbon dioxide is the gas everyone talks about because of how much we emit, but it is the most influential greenhouse gas ? I know there are a lot of other gasses are way more potent to retain heat ...
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1answer
81 views

What was the percentage of land mass in prehistoric times when temperatures were high enough that we had no ice caps?

I grew curious after watching a presentation about the large creatures of prehistoric times. One of the theories cited about why creatures were so big was the increased oxygen in the atmosphere due to ...
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347 views

How does the existence of a Greenhouse Gas Effect (GHE) in the atmosphere affect the tropospheric lapse rate? [duplicate]

I am restricting my consideration, for the moment, to just the troposphere. With regard to our understanding of the GHE do we predict that an increased GHE due to increasing CO2/Water/Methane will ...
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80 views

What would be the sea level rise if all fossil fuel resources are burned?

Tokarska et al. (2016), a Nature article from a team of the University of Victoria, predicted a global temperature increase of 7±2.5°C and 17.2±2.5°C at the equator and at the poles ...