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Transcript of Climate Forcing
Earth has warmed since 1880 -most of warming occcured in the 1970s with the 20 warmest years having occured since 1981 with all 10 of the warmest years occuring in the past 12 years. Climate forcing has to do with the amount of energy we receive from the sun, and the amount of energy we radiate back into space. Differences in climate forcing are determined by physical influences on the atmosphere such as orbital and axial changes as well as the amount of greenhouse gas in our atmosphere. Basically forcing is being done in the space between the earth and the sun in the space. There are a lot of data group or researchers that study climate forcing like the NOAA, world data center, and the NASA. Top one 1930 total aerosols
Middle one 1960 total aerosols
Last one 1990 total aerosols Orbital Variability
- variations in the Earth's orbit around the sun (Milankovitch forcing) affect the distribution of the solar energy about the globe. resulting in changes in seasonality and climate.
- the output of energy from the sun varies slightly over time, changing the total amount of energy absorbed by the Earth's atmosphere and thus affecting climate.
- can affect formations of clouds, as well as increase the Earth's albedo and coll the climate
Atmospheric Trace Gases
- carbon dioxide, methane, and other trace gases absorb infrared energy, resulting in greenhouse warming of the earth
- volcanic eruptions can inject large amounts of aerosols into the atmosphere, increasing the earth's albedo (reflectivity) and cooling the climate. Graph showing CO2 till for 400,00