Positive climate feedback - Revision history

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	[[File:Arctic_Sea_Ice_Minimum_Comparison.png\|360px\|thumb\|right\|Figure 1. A map showing the decrease in arctic sea ice over the years. The melting of ice and corresponding change in albedo is one major positive feedback.<ref>Wikimedia Commons. (October 10, 2015). ''Arctic Sea Ice Comparison'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b1/Arctic_Sea_Ice_Minimum_Comparison.png</ref>]]		[[File:Arctic_Sea_Ice_Minimum_Comparison.png\|360px\|thumb\|right\|Figure 1. A map showing the decrease in arctic sea ice over the years. The melting of ice and corresponding change in albedo is one major positive feedback.<ref>Wikimedia Commons. (October 10, 2015). ''Arctic Sea Ice Comparison'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b1/Arctic_Sea_Ice_Minimum_Comparison.png</ref>]]

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	[[File:Arctic_Sea_Ice_Minimum_Comparison.png\|360px\|thumb\|right\|Figure 1. A map showing the decrease in arctic sea ice over the years. The melting of ice and corresponding change in albedo is one major positive feedback.<ref>Wikimedia Commons. (October 10, 2015). ''Arctic Sea Ice Comparison'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b1/Arctic_Sea_Ice_Minimum_Comparison.png</ref>]]		[[File:Arctic_Sea_Ice_Minimum_Comparison.png\|360px\|thumb\|right\|Figure 1. A map showing the decrease in arctic sea ice over the years. The melting of ice and corresponding change in albedo is one major positive feedback.<ref>Wikimedia Commons. (October 10, 2015). ''Arctic Sea Ice Comparison'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b1/Arctic_Sea_Ice_Minimum_Comparison.png</ref>]]

	<onlyinclude>'''Positive climate feedback''' is a process that is one type of [[climate feedback]] wherein some initial change in the climate causes some secondary change that in turn increases the effects of the initial change, essentially magnifying the initial effect.<ref name="RE1">NASA Global Climate Change. (October 10, 2015). ''The Study of Earth as an Integrated System'' [Online]. Available: http://climate.nasa.gov/nasa_role/science/</ref> Positive climate feedbacks are often discussed in the context of [[climate change]] and is one sub-type of [[positive feedback]].</onlyinclude>		<onlyinclude>'''Positive climate feedback''' is a process that is one type of [[climate feedback]] wherein some initial change in the climate causes some secondary change that in turn increases the effects of the initial change, essentially magnifying the initial effect.<ref name="RE1">NASA Global Climate Change. (October 10, 2015). ''The Study of Earth as an Integrated System'' [Online]. Available: http://climate.nasa.gov/nasa_role/science/</ref> Positive climate feedbacks are often discussed in the context of [[climate change]] and is one sub-type of [[positive feedback]].</onlyinclude>

	Similar to how keeping money in a savings account earns interest and compounds to earn ''more'' money, positive climate ~~feedbacks increase~~ some initial change in the climate. Some initial warming is accompanied by additional warming from some other process, which in turn results in even ''more'' warming. For further explanation on what a positive feedback is in general, click [[positive feedback\|here]].		Similar to how keeping money in a savings account earns interest and compounds to earn ''more'' money, positive climate feedback increases some initial change in the climate. Some initial warming is accompanied by additional warming from some other process, which in turn results in even ''more'' warming. For further explanation on what a positive feedback is in general, click [[positive feedback\|here]].

	Although there are also [[negative climate feedback]]s, positive feedback cycles are what are so disconcerting. Positive feedback cycles accelerate climate change as they increase warming, leading to large [[nonlinearity\|non-linear]] responses. With positive feedback, some minor change in the state of the [[climate]] can result in a large change overall. This is in stark contrast with negative feedback, which reduces the impact of some initial climate change by acting in the opposite direction, bringing it back to its initial state.<ref name = "RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>		Although there are also [[negative climate feedback]]s, positive feedback cycles are what are so disconcerting. Positive feedback cycles accelerate climate change as they increase warming, leading to large [[nonlinearity\|non-linear]] responses. With positive feedback, some minor change in the state of the [[climate]] can result in a large change overall. This is in stark contrast with negative feedback, which reduces the impact of some initial climate change by acting in the opposite direction, bringing it back to its initial state.<ref name = "RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>
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	==References==		==References==
	{{reflist}}		{{reflist}}
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[[Category:Done 2016-01-15]]
[[File:Arctic_Sea_Ice_Minimum_Comparison.png|360px|thumb|right|Figure 1. A map showing the decrease in arctic sea ice over the years. The melting of ice and corresponding change in albedo is one major positive feedback.<ref>Wikimedia Commons. (October 10, 2015). ''Arctic Sea Ice Comparison'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b1/Arctic_Sea_Ice_Minimum_Comparison.png</ref>]]

<onlyinclude>'''Positive climate feedback''' is a process that is one type of [[climate feedback]] wherein some initial change in the climate causes some secondary change that in turn increases the effects of the initial change, essentially magnifying the initial effect.<ref name="RE1">NASA Global Climate Change. (October 10, 2015). ''The Study of Earth as an Integrated System'' [Online]. Available: http://climate.nasa.gov/nasa_role/science/</ref> Positive climate feedbacks are often discussed in the context of [[climate change]] and is one sub-type of [[positive feedback]].</onlyinclude>

Similar to how keeping money in a savings account earns interest and compounds to earn ''more'' money, positive climate feedbacks increase some initial change in the climate. Some initial warming is accompanied by additional warming from some other process, which in turn results in even ''more'' warming. For further explanation on what a positive feedback is in general, click [[positive feedback|here]].

Although there are also [[negative climate feedback]]s, positive feedback cycles are what are so disconcerting. Positive feedback cycles accelerate climate change as they increase warming, leading to large [[nonlinearity|non-linear]] responses. With positive feedback, some minor change in the state of the [[climate]] can result in a large change overall. This is in stark contrast with negative feedback, which reduces the impact of some initial climate change by acting in the opposite direction, bringing it back to its initial state.<ref name = "RE2">NOAA. (October 10, 2015). ''Positive Feedback'' [Online]. Available: https://www.ncdc.noaa.gov/paleo/abrupt/story2.html</ref>

==Examples of Positive Feedback==
There are disconcerting positive feedback cycles being observed and predicted.<ref name="RE3">Climate Communication. (October 10, 2015). ''Climate Warming Feedback'' [Online]. Available: https://www.climatecommunication.org/climate/climate_feedbacks/</ref> It is important to note that these different types of positive feedback result in a different amount of warming overall. The following are a few of the climate endangering cycles.

===Ice-Albedo Feedback===
One example of a positive feedback is the melting of ice - particularly sea ice - and corresponding decrease in [[albedo]] (see Figure 1). Ice is white and highly reflective - corresponding to a high albedo. This reflectivity prevents some incident [[sunlight]] from being absorbed.<ref name="RE1"/> However, when ice melts the vegetation, soil, or [[water]] beneath it is exposed. These surfaces are darker and heat faster and thus have a lower albedo. As these surfaces with a lower albedo are exposed to the [[Sun]], they absorb more [[solar radiation]] than the ice would have. This absorption further raises temperatures and causes even more ice to melt, continuously heating and pushing the cycle. This feedback can act more quickly over the ocean than over land as sea ice is able to melt more quickly than large, continental ice sheets.<ref name="RE3"/>

===Water Vapour Release===
The human-caused release of [[greenhouse gases]] into the [[atmosphere]] as a result of [[fossil fuel]] [[combustion]] is the initial cause of climate change. These human activities increase global temperature as these gases trap heat in the atmosphere as a result of their basic properties. The feedback comes when the warmer atmosphere results in more [[evaporation]] of water on the surface of the Earth. As the water from the Earth evaporates, it turns into [[water vapour]] in the atmosphere. This water vapour thus causes even more warming of the atmosphere, creating a self-reinforcing cycle of heating.<ref name="RE3"/>

===Carbon Release===
As the temperature on the Earth increases, permafrost begins to thaw. This permafrost contains large amounts of [[carbon]] that was contained in frozen soil. Thus the melting of the permafrost releases [[methane]] into the atmosphere. As these greenhouse gases are released they cause more warming, which in turn causes more thawing and more carbon release.<ref name="RE3"/>

==References==
{{reflist}}