ESS102H1 Lecture Notes - Canada Basin, Southern Ocean, Trametes

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Published on 20 Feb 2013
School
Department
Course
GLG205 January 24, 2013
Atmosphere
- Protects the earth
- Shorter wv more energy
- Infrared longer wv and ass with heat
- Atmosphere traps outgoing ir traps remitted light not incoming
- Average temp -15 -18 without greenhouse
- Damn enhanced greehnhouse effect
- Where oxygen comes from
Atmosphere
- Density
- Air pressure drops as you go up
- Up in atmpspheric column airpressure drops
- 5km half in air pressure
- 90 percent of gas is in lower 15 16 km and most is less dense above that
- Atmpsphere filter and buffer of incoming solar radiation
Wv
- Longer ev lower energy shorter wv more energy
- Energy from sun is uv
- Sun emits higher energy and is absorbed in higher atmosphere
Next
- 4 layers, all different things
- Different parts of em radioatation penetrate different depths Ingra and visible go deep and uv in
stratosphere is uv where ozone layer is
- Light make to surface and remitted
Different layers
- Trop is thicker at equator then at poles and defined by temperature gradient and when
inversion occurs
- Plus 15 at surface and drops in trop bc radiation absorbed surface of planet ir and drops off
- The trop and start inverts and increases again is bc ozone layer absorbing uv radiation
- Meso not do a whole lot temp drops off a bit
- As thermosphere warms up bc gamma and high energy radiation absorbed
- High temps
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- Not a lot of gas but doing very important absorption
Trop
- Where we live know live in troposphere and next is stratosphere
- Dynamic air movement
- Hot air near surface les dense and rises lower dense on top high density and lot of circulation
- Convective layer
Stratosphere
- Very stable
- Stratification
- Role of it and convection and why things flow
- Stratosphere not a lot of circ low dense on top of dense air nothing driving circulation some
see it aas stable cap of troposphere
- Stable system
- Cap on weather troppshere
- Stable and stratified
- Bc of stable column of air
- Increase in temp is by absorption of uv by ozone layer
- And increase
Mesosphere
- Boring layer
- Not a lot happens
- Ozone stopped absorbing so cools off
- Ozone little in there
Thermo
- Little gas less then 1percent of gas atoms there
- High energy radiation is absopred
Radiation budget
- Of solar radiation 70 percent is absorbed and 30 pecent is reflected right off the bat the earths
albedo overall energy budget ofplanet
- 70 percent absorbed surface and from particles in air majority is surface
- Once absiprbed remitted as ir and leave planet
Natural greenhouse
- Balcne incoming and outgoing
- Incoming short and longer ir bouncing around and absorbed by greenhouse gases
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The greenhouse effect
- 30 sun is reflected back
- Of 70 percent most by land and by atmospheric particles remitted ir
- Green house gas absorb it and remit it as it
- Trap long wl and heat up earth
Next
- Greenhouse trap 80 percent
- They don’t absorb solar radiation outgoing infrared radiation
What are greenhouse gases
- Role of water vapor largerst greenhouse gas most ir absorption and warmth second is co2
- Co2 second largets all these in no and ozone equal about
- Ozone protect from uv in troposphere ozone is part of smog different
- A lot of these gases change depending on temp water vapor not
- Pump little co2 increase temp bc sig ghg and air mass hold more eater and aplify warming if air
mass colles percepeitiate water vapor not change temp its passice not driver but feedback
temp change then water vapor not driver but largest ghg and amplified change we make if
cool amplify the cooling bc temp drop less water vapor amplifies direction of change
- They varied always been there makes life possible
- 30 degree difference
- Happy ghe exist
Energy per second
- Why they absorb
- Why mention important
- Incoming shorter wv not a lot absorb incoming in atmosphere
- Reimteed ir all gases that absorb in this band
- Co2 and h20 high absorbers no2 and methane
- 03 high energy
Enhanced ghe
- Not new thing
- In late 1800s and earlier then that
- Rough theories 1850s
- Arrenhius put number on it showed based on measured radiatin absorption of co2 doubling
co2 lead to plus 5 to 6 degrees
- Not change that much
- His was bit larger
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