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IBDP Biology- Global temperature and climate change

Topic 4- Factors leading to climate increase

· IBDP BIOLOGY,climate change,IB

In this IBDP Biology blog post, we will see how global temperature influences climate change, and what the coorelation between the two are.

Global Temperature and Climate Change influenced

Global temperature and climate patterns are influenced by concentrations of greenhouse gases in the atmosphere

The is a strong dispute about whether global warming and other climate changes are due to greenhouse gas emissions from human activity  

Correlation between rising CO2 & temperatures sinc  

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To find out Temperatures and Carbon Dixode concentrations from the past coloumns of ice have been drilled in the Antartic.

  • Ice deeper within is older than the ice near the surface
  • Bubbles of air trapped in the ice can be extracted and analysed to find the CO2 concentration
  • Global temperatures can be deduced from hydrogen isotopes in the water molecules
  • Correlations do not mean causations - research showed CO2 is a greenhouse gas
  • Atleast some of the tempreature variations over the years must therefore have been to rises and falls of atmospheric carbon dioxide

Evidence:

  • Correlation supported by ice core data over 400 000 years
  • Temperature shows greater variation than carbon dioxide
  • Most rises and falls in CO2 correlated with rises and falls in temperature

Recent increases in CO2 are because of combustion  

Strong correlation between human emissions of fossilzed organic matter and and atmospheric levels of CO2

As CO2 levels increased the amount of CO2 absorbed by carbon sinks has increased

(only about 40% of emissions have remained in the atmosphere

200 years ago both combustion of fossil fuels and CO2 concentrations have increased more steadily along with the global temperatures

CO2 concentrations and global temperature are correlated but not directly proportional as other variables also affect temperatures such as sun spot activity

Increases in greenhouse gases will likely cause:

  • Higher global average temperatures 
  • More frequent and intense heat waves
  • Areas becoming more prone to droughts
  • Areas becoming more prone to intense rainfall and flooding
  • Changes to ocean currents
  • Tropical storms will become more frequent and more powerful  

That's it for this sub-topic!

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References:

  • https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.nationalgeographic.org%2Fencyclopedia%2Fgreenhouse-effect%2F&psig=AOvVaw0yAmbYcdHGw5tjoObR13bQ&ust=1626287125520000&source=images&cd=vfe&ved=0CAoQjRxqFwoTCLCr3OfV4PECFQAAAAAdAAAAABAD

Drafted by Venetia (Biology)

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