Biology 2382B Lecture Notes - Lecture 18: Organofluorine Chemistry, Sun-2, Lithosphere

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Climate Change
Weather vs. Climate
- Weather atmospheric conditions (temperature, humidity, pressure, wind) at localized sites over hours/days.
- Climate mean and variance of atmospheric conditions (temperature, humidity, pressure, wind) over the long-
term over large geographic regions (considering the Earth as a whole, we can talk about a gloal liate.
- It’s ee a reall old iter, so liate hage is’t happeig confusing weather w/climate
3 Factors Influence Global Climate:
1) Sun supplies plaet’s eerg - most important)
2) Atmosphere (absorbs 70% of incoming solar radiation - odulates Earth’s teperature
3) Oceans (shape climate by storing and transporting heat (currents) and moisture)
- W/out the sun and atmosphere, the Earth would be a lot colder than it is.
Greenhouse Gases are atmospheric gases that absorb infrared radiation radiatiel atie gases. These ilude
water vapour, ozone, carbon dioxide, nitrous oxide, methane, chlorofluorocarbons (CFCs) and hydrofluorocarbons
(HFCs); CFCs and HFCs are synthetic, we put them into the atmosphere.
- After absorbing radiation, greenhouse gases re-emit infrared energy
- some energy is lost to space
- some energy travels back downward, warming the troposphere ad the plaet’s surface this effect is
called the Greenhouse Effect
Global Warming Increase in the Earth’s aerage teperature. A irease i the Greehouse Effet leads to
Global Warming.
- Incoming solar radiation can be reflected,
absorbed, or transmitted through atmosphere to
Earth’s surfae.
- Most of the incoming solar radiation is absorbed
by the surface and it heats up.
- Any object above 0K emits radiation in
proportion to its temperature (hotter object =
more energetic = shorter wavelength of radiation
emitted). The Earth emits long wavelength
infrared radiation, after being heated up be the
solar radiation, which goes back up to the
atmosphere where it is either passes through the
atmosphere or reflects off the atmosphere and
ars the Earth’s surfae agai ost of it is
reflected). Cycle between the red arrows is the
greehouse effet – gases in the atmosphere
trap radiation and reflect it towards the Earth;
without the gases in the atmosphere, the
radiatio fro Earth’s surfae ould’t e
trapped and so the Earth would be a lot colder
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Document Summary

Weather atmospheric conditions (temperature, humidity, pressure, wind) at localized sites over hours/days. Climate mean and variance of atmospheric conditions (temperature, humidity, pressure, wind) over the long- term over large geographic regions (considering the earth as a whole, we can talk about a (cid:862)glo(cid:271)al (cid:272)li(cid:373)ate(cid:863)(cid:895). (cid:862)it"s (cid:271)ee(cid:374) a reall(cid:455) (cid:272)old (cid:449)i(cid:374)ter, so (cid:272)li(cid:373)ate (cid:272)ha(cid:374)ge is(cid:374)"t happe(cid:374)i(cid:374)g(cid:863) confusing weather w/climate. 3 factors influence global climate: sun (cid:894)supplies pla(cid:374)et"s e(cid:374)erg(cid:455) - most important, atmosphere (absorbs 70% of incoming solar radiation - (cid:373)odulates earth"s te(cid:373)perature(cid:895, oceans (shape climate by storing and transporting heat (currents) and moisture) W/out the sun and atmosphere, the earth would be a lot colder than it is. Incoming solar radiation can be reflected, absorbed, or transmitted through atmosphere to. Most of the incoming solar radiation is absorbed by the surface and it heats up. Any object above 0k emits radiation in proportion to its temperature (hotter object = more energetic = shorter wavelength of radiation emitted).

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