Climate Change and Biodiversity

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The impacts of climate change of the past, present and future
Taneeka Johnston
Fichas por Taneeka Johnston, actualizado hace más de 1 año
Taneeka Johnston
Creado por Taneeka Johnston hace alrededor de 8 años
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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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