earth systems. things to think about look at the world map 1.earths surface is not smooth. what do...
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Earth Systems
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Things to think about
• Look at the world map1. Earth’s surface is not smooth. What do you
think causes variations in its surface?2. Is the Earth changing? List any evidence
(features or processes) that it is or is not changing.
3. What changes might occur to Earth’s surface 1. On a time scale of 100 years2. On a long time scale (10,000 – 1,000,000s)
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USGS recent earthquakes
• Recent Earthquakes
• http://earthquake.usgs.gov/earthquakes/– The above link is to recent earthquakes
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• What does the pattern of earthquakes and volcanoes suggest?
• How about the shape of the continents?
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Tectonic plates
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Animation: breakup of pangea
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es0806/es0806page01.cfm?chapter_no=visualization
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Structure of the Earth
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Heat: where did it (does it) come from?
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How do scientists knowabout the Earth’s structure?
• One way: earthquake waves that pass through the Earth and over the Earth’s surface– P waves (compressional, primary)– S waves (shear, secondary)
• Model
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Plate boundaries
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More evidence ofcontinental drift
• The colored bands represent where fossils of different critters and plants have been found.
• They span two or more continents.
• These creatures do NOT swim—or they are freshwater animals—so the continents must have been connected
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Convection in the mantle
• http://www.classzone.com/books/earth_science/terc/content/visualizations/es0805/es0805page01.cfm?chapter_no=visualization
• Show the mantle model
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Sea-floor spreading
• Mid-ocean ridge
• Diverging plate boundary
• How do we know?1. Prediction about age of sea floor
2. Magnetic reversals
3. It’s still spreading!
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What does it mean…• To refer to the Earth as a system?
• Think ``machine’’ versus ``parts’’
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Parts of the earth system
• Lithosphere (geosphere)
• Hydrosphere
• Atmosphere
• Biosphere
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Open vs closed system
• Open: exchanges energy, matter, and/or information with other systems
• Closed: isolated and self-contained
• Is the Earth open or closed?– Energy?– Matter?
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Hydrosphere
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•
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What happens to water
• With one partner, sketch out where you think water goes.
• Start with water in the ocean.
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Water cycle
• Nasa's water cycle movie
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Ocean water
• 96.5 % H2O by mass
• Remainder: various salts [35 parts per thousand]
• Temperature:– Warmer near the surface– Deep water (below ~1000 m) is equally cold
• Density:– Colder, saltier water is denser = deep water
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Salinity patternsnumber is “parts per thousand”
•
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Ocean currents
• Water flows horizontally
• Causes?– Surface: wind– Deep: density differences – salinity,
temperature
• Ocean conveyor - YouTube
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Vertical movements
• Upwelling– Deep, cold water rises to replace surface
waters that flow away– Brings nutrients to surface– Site of rich fisheries
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Freshwater
• Review: Where is the freshwater on Earth, and in approximately what percentages?– Ice caps, glaciers: 69 %– Aquifers: 30 %– Surface water: 0.9%– Atmosphere (and biosphere): 0.1%
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Aquifers
• Rock layers below the surface of the earth that are porous and hold water.
• Water moves through an aquifer just as water moves in a river.
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• See All the Water in the world, Google Earth
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Aquifer
•
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How water moves in aquifers
• In a word:– SLOWLY!
• Depends on the size of the pore spaces. – Smaller spaces mean slower flow
• At the other extreme: Large ``pore’’ space of a cave might have a river run through it
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Aquifers
• Supply drinking water
• Anyone who has a well gets water from an aquifer
• About HALF of all Americans get most of their water from wells
• RECHARGE is key—the infiltration of water back to the aquifer
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Aquifers
• Is the water clean?• Water moving through pore spaces of rock
or gravel is naturally filtered– ``coffee filter’’ keeps coffee grounds behind
• Dissolved chemicals can contaminate an aquifer and water pumped from its wells.– The filter doesn’t prevent the ``coffee’’ from
going through
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•
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What is this picture?
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•
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• >97% of the water flowing into Lake Mead comes from snow melt and rain—runoff—in the Rocky Mts, the source of the Colorado R.
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Lake Mead
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Lake Mead water levels
• http://www.arachnoid.com/NaturalResources/
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US drought monitor
• http://www.drought.unl.edu/dm/monitor.html
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The atmosphere
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Where did the atmosphere come from?
• May have developed from gases released by volcanoes.
• This is Kilauea in Hawaii.
• Early atmosphere very different from today.
• NO O2, but H2O, CO2, CH4, HCl
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Composition
• Nitrogen – 78 %• Oxygen – 21 %• All the rest???
– Carbon dioxide, methane, CFCs,
• Water vapor is variable, from 0 to 4 %
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Structure
• 4 major layers• Troposphere: where the
weather is• Tropopause: jet stream• Stratosphere: ozone
layer• 99% of the total mass of
the atmosphere is below 32 km
• Temp. drops 5-10 C every 1 km in troposphere
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Impact of air density
• Where is air densest? Where is it least dense?
• How does this affect a batted baseball?
• http://profhorn.meteor.wisc.edu/wxwise/baseball/homerun.html
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• NOT true any longer: air conditioners and refrigerators no longer contain CFCs
• BUT: CFCs last a long time in the atmosphere (decades) so these gases are still doing damage.
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Troposphere
• Our sphere• Weather• Notice: patterns
– Temperature– Winds
• Layer ends when temp. no longer varies with height = tropopause
•
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Water cycle
• Connects ocean
and atmosphere • Key pt: what
happens in the atmosphere depends a lot on what happens in the ocean
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Solar energy
• • Energy from sun• Some absorbed by
gases (O3, H2O)• Some reflected by
clouds and by the Earth’s surface
• Last is called albedo
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albedo
• Notice snow, water, and clouds
• What feedback effects would you expect from melting of ice caps?
•
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Energy transfer
•
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Energy transfer
• Simplified earth: slow rotation to east, no interaction of oceans and land
• Sun warms equator, air rises, spreads north and south
• Cold air at poles sinks and replaces• Air deflected by rotation, to right in N
hemisphere, to left in S hemisphere– Coriolis effect