L37 Effects of Climate Change Flashcards
what happens biomes with climate change?
they change corresspondingly
when was the LGA/ Last glacial maximum?
20,000 years ago
what happened in the LGA?
ocean provided moisture for ice sheets to form, sea levels dropped
OM was reserved in soil sediments
During the last glacial maximum, Om was frozen and reserved in soil beds, why is this good?
it provides us with a historic record of pollen evolution
in the graph in your notes why is there a blank followed by lots of activity?
it shows the glaciation period, tundra was replaced by temperate forest (much more biodiversity)
when did the closed forests and extreme deserts take over?
early holocene, around 8,000 years ago
what has changed in relation to biome spread, since the early holocene?
more desert biome coverage
From predictive modelling, what is the earth thought to look like with double the amount of CO2?
boreal forest replaced by temperate forests
tundra replaced by boreal forests
what does the Zunich model show?
reduction and replacement of biomes
what type of relationship can be graphically observed between cumulative CO2 emissions and the increase in global surface temperature?
linear
How can we compare CO2 levels today with CO2 levels from past?
1952 paleo record has trapped bubbles from Antarctic Ice
what happens from the melting of permafrost?
less tundra, more boreal
what prevents biomes from moving and adapting to this climate change?
human infrastrcuture - roads and farms
what is the emission gap?
a summary provided to us by the UN which tells us how we are doing in relation to the composition of the atmosphere
what happened when Mt Pinatubo erupted in 1991?
20 million tons of SO2 erupted into atmosphere, planet cooled by 0.5 degrees for 18 months
