chapter 5 ecosystems and the physical environment 112/rav7e_ch05... · light colors = high albedo...
TRANSCRIPT
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Chapter 5Ecosystems and the PhysicalEnvironment
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Overview of Chapter 5
Cycling of Materials within Ecosystems
Solar Radiation
The Atmosphere
The Global Ocean
Weather and Climate
Internal Planetary Processes
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Cycling of Materials
Matter moves between ecosystems, environments, and organisms
Biogeochemical cycling involves
Biological, geologic and chemical interactions
Five major cycles:
Carbon, Nitrogen, Phosphorus, Sulfur and Water (hydrologic)
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The Carbon Cycle
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The Nitrogen Cycle
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The Phosphorus Cycle
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The Sulfur Cycle
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The Water (Hydrologic) Cycle
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Solar Radiation
Albedo
The reflectance of solar energy off earth’s surface
Dark colors = low albedo
Forests and ocean
Light colors = high albedo
Ice caps
Sun provides energy for life, powers biogeochemical cycles, and determines climate
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Temperature Changes with Latitude
Solar energy does not hit earth uniformly
Due to earth’s spherical shape and tilt
Equator (a)
High concentration Little Reflection High Temperature
Closer to Poles (c)
Low concentration Higher Reflection Low Temperature
From (a) to (c)
In diagram below
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Temperature Changes with Season
Seasons determined by earth’s tilt (23.5 )
Causes each hemisphere to tilt toward the sun for half the year
Northern Hemisphere tilts towards the sun from March 21- September 22 (warm season)
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The Atmosphere
Content
21% Oxygen
78% Nitrogen
1% Argon, Carbon dioxide, Neon and Helium
Density decreases with distance from earth
Shields earth from high energy radiation
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Atmospheric Layers
Troposphere (0–10km)
Where weather occurs
Temperature decreases with altitude
Stratosphere (10–45km)
Temperature increases with altitude- very stable
Ozone layer absorbs UV
Mesosphere (45–80km)
Temperature decreases with altitude
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Atmospheric Layers
Thermosphere (80–
500 km)
Gases in thin air absorb x-
rays and short-wave UV
radiation = very hot
Source of aurora
Exosphere (500km and
up)
Outermost layer
Atmosphere continues to
thin until converges with
interplanetary space
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Atmospheric Circulation
Near Equator
Warm air rises, cools and splits to flow towards the poles
~30 N & S sinks back to
surface
Air moves along surface back towards equator
This occurs at higher latitudes as well
Moves heat from equator to the poles
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Large winds due in part to pressures caused by global circulation of air Left side of diagram
Winds blow from high to low pressure Right side of
diagram
Low
Low
Low
High
High
High
High
Surface Winds
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Earth’s rotation influences direction of wind
Earth rotates from East to West
Deflects wind from straight-line path
Coriolis Effect
Influence of the earth’s rotation on movement of air and fluids
Turns them Right in the Northern Hemisphere
Turns them Left in the Southern Hemisphere
Coriolis Effect
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Coriolis Effect
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Prevailing winds produce ocean currents and generate gyres
Example: the North Atlantic Ocean
Trade winds blow west
Westerlies blow east
Creates a clockwise gyre in the North Atlantic
Circular pattern influenced by coriolis effect
Patterns of Ocean Circulation
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Patterns of Ocean Circulation
Trade winds
Westerlies
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Very little land in the Southern Hemisphere
Large landmasses in the Northern Hemisphere help to dictate ocean currents and flow
Position of Landmasses
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Vertical Mixing of Ocean
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El Niño-Southern Oscillation (ENSO) Periodic large scale warming of surface waters of
tropical E. Pacific Ocean
Normal conditions westward blowing tradewinds keep warmest
water in western Pacific
ENSO conditions trade winds weaken and warm water expands
eastward to South America
Big effect on fishing industry off South America
Ocean Interaction with Atmosphere - ENSO
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ENSO Climate Patterns
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Weather
The conditions in the atmosphere at a given place and time
Temperature, precipitation, cloudiness, etc.
Climate
The average weather conditions that occur in a place over a period of years
2 most important factors: temperature and precipitation
Weather and Climate
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Mountains force humid air to rise
Air cools with altitude, clouds form, and precipitation occurs (windward side)
Dry air mass moves leeward side of mountain
Rain Shadows
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Powerful funnel of air associated with a severe thunderstorm
Formation
Strong updraft of spinning air forms as mass of cool dry air collides with warm humid air
Spinning funnel becomes tornado when it descends from cloud
Wind velocity = up to 300 mph
Width ranges from 1m to 3.2 km
Tornadoes
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Giant rotating tropical storms
Wind > 119 km per hour
Formation Strong winds pick up moisture over warm
surface waters and starts to spin due to Earth’s rotation
Spin causes upward spiral of clouds
Many names: Hurricane (Atlantic), typhoon (Pacific),
cyclone (Indian Ocean)
Tropical Cyclone
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Layers of the earth
Lithosphere
Outermost rigid rock layer composed of plates
Asthenosphere
Lower mantle comprised of hot soft rock
Internal Planetary Processes
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Plate Tectonics- study of the processes by which the lithospheric plates move over the asthenosphere
Plate Boundary - where 2 plates meet
Divergent
Convergent
Transform
Internal Planetary Processes
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Plates and Plate Boundaries
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Caused by the release of accumulated energy as rocks in the lithosphere suddenly shift or break Occur along faults
Energy released as seismic wave
Earthquakes
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Giant undersea wave caused by an earthquake, volcanic eruption or landslide
Travel > 450 mph
Tsunami wave may be 1m deep in ocean
Becomes 30.5m high on shore
Magnitude 9.3 earthquake in Indian Ocean
Triggered tsunami that killed over 230,000 people in South Asia and Africa
Tsunami
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