5 Greenhouse effect Flashcards
what is happening at 1?
1 sun produces radiation at different wavelengths
1 shorter wavelengths pass through the atmoshpehere
what is happening at 2?
some energy at the wrong wavelength gets reflected back out (LONG)
what is happening at 3?
energy is absorbed by the land, heating it and its surroundings up
what is happening at 4?
greenhouse gases will absorb the heat and re-emit the heat energy, some to earth other to space (above ozone layer)
what is happening at 5?
heat is effectively trapped and warms the earth (important for life to occur and all metabolic reactions)
name two greenhouse gases.
CO2 and methane
is the greenhouse effect good?
YES! the earth needs to be at a temperature where water is not frozen as it is needed for all life
evaluate the use of temperature records as evidence for climate change.
- reliable but short term
- only more accurate in recent decades
- remember to look at error bars
how is dendrochronology used as evidence for cc?
- scientist remove core from trees and date each ring by counting the total number
- by looking at the thickness of each ring they can see what the climate was like each year
ring are thicker when the climate at the time was ________. why?
WARMER= thicker
better conditions for growth
what is a climate proxy?
-preserved physical characteristics of the past that stand in for direct estimations
what is a peat bog?
areas of wetland that have formed layers over thousands of years due to dead plant material mainly
how is pollen in part bogs evidence for cc?
- scientists can take cores from peat bogs and extract pollen grains from different layers
- then identify the plant species the pollen came from
- pollen from similar plant species now can represent the climate conditions needed for this plant to successfully grow= approx temp of climate
what does a gradual increase in pollen from a plant species that is more successful in warmer climates show?
-increase in global temperature
explain why only pollen from successful plant species is preserved in peat bogs
only fully grown/mature species produce pollen
explain how biofuels may reduce global warming.(3)
- possibly carbon neutral/ to replace fossil fuels
- plants used for biofuels
- CO2 used for photosynthesis by plants
what is a carbon sink?
any reservoir natural or otherwise that stores some carbon containing chemical compound= therefore lowing the conc of CO2 in the atmosphere (vegetation+ the ocean)