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Trees & the atmosphere (Trees in urban areas (Biodiversity, Economy,…
Trees & the atmosphere
Forests
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Climate impacts
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Climate models used to look at impact of changing distribution of forests- depends where forest is: Tropic areas where trees grow quickly and store more carbon (colder), snowy forests in Arctic has warming
Forest loss in South America, Africa, N. America between 1990-2010, however loss is decreasing
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BVOCs
Trees emit Biogenic volatile Organic Compounds (BVOCs)- molecules made up of carbon atoms (isoprene in oak trees and monoterpenes in pine trees)
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Monoterprenes produced in leaf, stored as resin- v temp dependent (released from leaf when too warm)
Isoprenes synthesised in leaf but not stored- high emissions when plants photosynthetically active(CO2 and light dependent)
BVOCs react quickly with O2 compounds (O3, NO3, OH) and oxidise them to larger molecules- reflect incoming solar radiation (DIRECT RELATIVE EFFECT)
Larger particles can act as a 'seed' for water droplets (soluble so stick easily)-> brighter clouds- cooling
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Emission of BVOCs leads to both warming (due to GGs) and cooling (due to particles) effects on climate