Methane Gas Release Flashcards

1
Q

What is methane primarily categorized as?

A

A powerful greenhouse gas

Methane occurs in the atmosphere mainly due to human activity.

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2
Q

What percentage of atmospheric methane concentration is produced by natural causes?

A

Just over 25%

Methane stores are highly sensitive to climate change.

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3
Q

What potential climate change event is associated with permafrost thawing?

A

Run-away climate change event

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4
Q

What is the relationship between atmospheric temperature and carbon gases?

A

Closely linked

A rise in carbon gas increases greenhouse gases, leading to accelerated warming.

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5
Q

What human activity is primarily responsible for the increase in atmospheric carbon dioxide?

A

Reliance on fossil fuel energy

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6
Q

What is the nature of the relationship between carbon and atmospheric temperature?

A

A two-way relationship

There is a correspondence rather than a clear cause and effect link.

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7
Q

How does increased temperature affect the solubility of carbon dioxide in oceans?

A

Reduces solubility

This increases the amount of carbon dioxide in the atmosphere.

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8
Q

What are the major storages (sinks) of carbon?

A
  • Atmosphere
  • Oceans
  • Biomass
  • Geology
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9
Q

What is the time scale of carbon fluxes?

A

From just a few hours to many millions of years

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10
Q

What is methane’s potency as a greenhouse gas compared to carbon dioxide over a 20-year period?

A

84 times more powerful

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11
Q

What percentage of human-induced global warming is attributed to methane?

A

20-30%

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12
Q

What percentage of atmospheric methane comes from anthropogenic influences?

A

75%

This includes agriculture, mining, and waste management.

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13
Q

Where does the majority of natural methane emissions originate from?

A

Wetlands

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14
Q

What percentage of wetland methane emissions come from tropical regions?

A

70%

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15
Q

What is a significant source of methane in the Arctic region?

A

Natural sources such as hydrate release

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16
Q

How quickly can methane emissions increase in a warming climate?

A

Rapidly with a small lag behind temperature change

17
Q

What conditions lead to greater methane emissions in wetlands?

A

Increased water table and/or temperature

18
Q

What significant risk is associated with global permafrost collapse?

A

Unlocking vast quantities of stored methane

19
Q

How much methane is estimated to be stored in global permafrost?

A

1,400 gigatonnes

20
Q

What was the estimated annual methane release from land-based permafrost in 2013?

A

17 million tons

21
Q

What is a key positive feedback loop related to methane?

A

Loss of methane from the Arctic

22
Q

What uncertainty exists regarding methane feedback in climate change?

A

Extent and time frame of positive feedback

23
Q

What did a study led by Joshua F Dean find about old methane emissions during the last deglaciation?

A

Emissions from old carbon sources were small

24
Q

What is a possible explanation for old methane being oxidized before reaching the atmosphere?

A

Microorganisms consuming thawing matter

25
Q

What is important to recognize regarding future climate predictions?

A

Full of uncertainty and possibility