6986201
Description
Flashcards by Taneeka Johnston, updated more than 1 year ago
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Created by Taneeka Johnston
about 8 years ago
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| Question | Answer |
| What are drivers of the Earths climate system? | - heat transfer -solar radiation -albedo - composition of the Earth's atmosphere - the Earth's energy balance - atmospheric circulation - ocean circulation |
| What are 3 major Green House Gases? | water vapor carbon dioxide methane |
| What maintains Earth's back radiation? | Green house Gases |
| What are the effects of climate change in WA? | - since 1950 increased rainfall - since 1950 reduced rainfall in SW WA -sea level rise ~ 9 millimetres each year between 1991 and 2011 - increasing temperatures (+ ~1 degree since 1910) |
| How do we measure past climate change? | Using indirect indicators--climate archives from: - water deposited sediments - tree-rings - coral growth rings - isotope composition of ice cores - cave deposits |
| How do we date the layers of past climate indicators? | - Radiometric dating - Radiocarbon dating of fossils - counting rings of coral or trees |
| How does radio carbon dating work? | carbon-14 decays with its half-life of 5,700 years; the amount of carbon-12 remains constant; looking at the ratio of carbon-12 to carbon-14 and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing |
| What is radiometric dating? | comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating |
| Types of climate proxies | - biota data: shifts in composition of remains of dead plants - geological/ geochemical data: physical weathering/ chemical weathering |
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