Ecosystems and the Physical Environment
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Transcript of Ecosystems and the Physical Environment
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Ecosystems and the Physical Environment4
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© 2012 John Wiley & Sons, Inc. All rights reserved.
Overview of Chapter 4
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- Biogeochemical Cycles
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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Gather into groups of 3-4.
I will assign you a biogeochemical cycle.
Brainstorm:
How do these chemical/compounds cycle on the planet? Why do living organisms need these chemicals/ compounds?
Draw a cycle with components of land, air and organisms.
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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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Toolik Lake, AlaskaNorth of Arctic circleSummer Solstice-light all dayWinter- dark all day
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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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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
Atmospheric Layers
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Atmospheric Layers
Thermosphere (80–500km) 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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Aurora Borealis
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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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Surface Winds
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
LowLow
LowLow
LowLow
HighHigh
HighHigh
HighHigh
HighHigh
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Coriolis Effect
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
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Coriolis Effect
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Patterns of Ocean Circulation
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
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Patterns of Ocean Circulation
Trade windsTrade winds
WesterliesWesterlies
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Position of Landmasses
Very little land in the Southern Hemisphere
Large landmasses in the Northern Hemisphere help to dictate ocean currents and flow
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Vertical Mixing of Ocean
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Ocean Interaction with Atmosphere- ENSO
El Niño-Southern Oscillation (ENSO) Periodic large scale
warming of surface waters of tropical E. Pacific Ocean
Prevents upwelling (pictured right) of nutrient-rich waters off South America
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Normal Conditions
Westward blowing tradewinds keep warmest water in western Pacific
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ENSO Conditions
Trade winds weaken and warm water expands eastward to South America Big effect on fishing industry off South America
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ENSO Climate Patterns
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Weather and Climate
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 Two most important factors: temperature and
precipitation
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Rain Shadows
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
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Tornadoes
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 300mph Width ranges from 1m to 3.2km
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Tropical Cyclone
Giant rotating tropical storms Wind >119km 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)
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Internal Planetary Processes
Layers of the earth Lithosphere
Outermost rigid rock layer composed of plates
Asthenosphere Lower mantle
comprised of hot soft rock
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Internal Planetary Processes
Plate Tectonics- study of the processes by which the lithospheric plates move over the asthenosphere
Plate Boundary - where 2 plates meet Divergent Convergent Transform
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Plates and Plate Boundaries
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Earthquakes
Caused by the release of accumulated energy as rocks in the lithosphere suddenly shift or break Occur along faults Energy released as seismic wave
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Tsunami
Giant undersea wave caused by an earthquake, volcanic eruption or landslide Travel > 450mph
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