EVSC 1450 3/15/16 5 Possible Causes of Climate Change
EVSC 1450 3/15/16 5 Possible Causes of Climate Change EVSC 1450
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This 0 page Class Notes was uploaded by Susannah Gilmore on Tuesday March 15, 2016. The Class Notes belongs to EVSC 1450 at a university taught by Deborah Lawrence in Spring 2016. Since its upload, it has received 14 views.
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Date Created: 03/15/16
31516Tying it together 5 Possible Causes of Climate Change Disproving Possible Causes 1 Tectonics Movement of continents 0 Ocean circulation the widening of oceans affects the way heat moves around the planet 0 High latitude landThis land can support ice sheets and affects temperature 0 Regulation of COzMountains forming and rock layers being exposed can alter chemical weathering exposed to the air and release C02 But continents don t move fast enough to affect the temperature in the past 50100 years so tectonics are not responsible for climate change 2 Sun Output 0 The sun often has ares and spots which some argue can affect the earth39s temperature The pulses of the sun are too quick to cause climate change and While the measurements may explain climate change in the distant past they don t account for the trend in recent warming 50 the sun is not responsible for climate change 3 Earth39s Orbit o The earth39s orbit changes slightly in 40000year cycles The more tilt of the earth the more sun shines on the poles and this affects the likelyhood of ice sheets 0 The orbit also affects the precession of the equinoxes and affects the distribution of sunlight o This has affected past climates ice ages But orbital variations are too slow and therefore do not cause the recent climate change 4 Internal Variability 0 quotEarth naturally cycles we39re just on the warm part of the cyclequot 0 You can get shortterm variation around the mean state for climate from things like elNino or volcanoes but on such a large scale El Nino can cause short term changes but a long term shift in temperature requires an energy imbalance so there is no solid evidence that internal variability causes the recent climate change 5 Greenhouse Gases 0 Most solid theory out of all ve 0 Greenhouse gases absorb and re ect infrared radiation and past observations show that C02 has historically been associated with temperature change When looking at ice cores it was discovered that C02 levels correlated with the earth39s temperature over the past millions of years In the past Temperature changed and was then followed by a carbon cycle feedback causing the responding change in C02 So historically C02 was a feedback but today it is a forcing There are measurements to prove this theory 50 therefore it is the most likely cause of recent climate change The IPCC states that climate change is extremely likely 95 con dence to be caused by anthropogenic humancaused greenhouse gases