Earth dynamic system
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Transcript of Earth dynamic system
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Earth System Dynamics
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1.An introduction to Earth System2.Solid Earth System
1.Earth Material2.Geology Cycle3.Solid Earth4.Plate tectonics
3.Earth Space Planet Science4.Climatology5.Hydrology and Hydrogeology6.Geo-environment for Education7. Focus on biota 7.1 Structure of biosphere 7.2 Effect of life on earth system8. Case study of applied technology 8.1 Hydrology and Hydrogeology 8.2 Earthquake 8.3 Geology 8.4 Biodiversity
Earth System Dynamics
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Earth System Dynamics
System and Structure components Open System Closed System
Earth Cycle Hydrologic Cycle Tectonic Cycle
Earth Circuit Depositional Environmental Subsystems El Nino and La Nina Phenomena Atmospheric and Oceanic Circulation
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The river is a system, lake is also a system. Together, they form a larger system the watershed. The small volumes of water and sediment indicated by boxes are examples of smaller systems.
The system concept: Certain boundary with components those relate or interact together
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The four parts of the Earth system that most directly concern environmental geology: lithosphere, biosphere, atmosphere and hydrosphere.
The interaction between subsystems conduct the Ecological System of Biosphere at the center.
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Energy and mass can transfer through the boundary of the considered open system.
Energy but not mass can transfer through the boundary of the closed system.
Two Types of Systems are Open System and Closed system.
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Isolated System mass and energy can not transfer. Closed System only energy can transfer. Open System mass and energy can transfer.
The three basic types of systems
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Energy from sun : Shortwave radiation transfer through the atmosphere and cloud to the earth surface.
Energy from earth surface and the atmosphere : Longwave radiation transfer through the atmosphere to space.
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Open system energy and mass can transfer through.
Energy (sunlight) and water (rainfall) reach an island from external sources. The energy leaves the island as long-wavelength radiation: the water either evaporates or drains into the sea.
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Open system through Hydrologic Model.
Depiction of the open system by a box model.
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The Earth is essentially a closed system. Energy reaches the Earth form an external source and eventually returns to space as long wavelength radiation. Smaller systems within the Earth, such as the atmosphere, biosphere, hydrosphere, and lithosphere, are open systems.
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EARTH CYCLE AND ENVIRONMENTAL SUBSYSTEMS
Two major types of earth cycles are
Hydrologic cycle
Tectonic cycle
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Hydrologic cycle : The cycle that shape the earth’s surface by water’s activities.
Shortwave energy from Sun is needed as well as longwave energy from earth.
To evaporate water into the atmosphere, then condense and coalesce together to form cloud.
Raindrops from cloud to impact soil, then infiltrate and runoff to the sea and ocean.
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Tectonic Cycle : The cycle that conduct the mountain orogeny, subduction and diverge of the earth crust.
Thermal energy in the asthenosphere and Upper mantle is needed to drive the cycle.
Diverge plate on the continent create sea. Diverge plate in the sea create sea floor spreading.
Converge plate in the sea conduct land
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Tectonic Cycle
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Earth Circuit
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The relationship between Earth’s internal and external processes and how the three major rock groups are related.
The Rock Cycle
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Depositional Environmental Subsystems
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High mountain : Glacial Environment
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Bottom Slope : Fluvial Environment
Lake Environment
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Bottom Slope : Fluvial Environment
Lake Environment
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Depositional Environmental Subsystems
Coastal Area :Estuarine Environment (Estuary, delta)
:Shore Environment (Beach, spit, bar, lagoon)
:Shallow marine Environment (Submarine valley, Shelf)
:Deep marine Environment (Submarine canyon)
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Estuarine Environment
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Shore Environment(Beach, spit, bar, lagoon)
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Shore Environment(Beach, spit, bar, lagoon)
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Shore Environment(Beach, spit, bar, lagoon)
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Deep marine Environment(Submarine canyon)
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Environmental System need all components interact together to support all activities for running the system sustainably.
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ท่ีมา : http://www.hextable.kent.sch.uk
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ท่ีมา: www.eapbiofield.wikispaces.com
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El Nino and La Nina Phenomena
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Water surface velocity• Equatorial drift 8-14 km/days• North Atlantic Drift 19 km/days• Gulf Stream 190 km/days
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La Nina
El Nino
Walker Circulation of El Nino and La Nina
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El Nino The term El Nino means 'Christ Child' and
was first used by Peruvian fishermen in the late 1800's to describe the warm current appearing off the western coast of Ecuador and Peru around Christmas time.
This was bad news for the fishermen, as they depended on cool water welling up from the deep carrying nutrients for the fish. No food – no fish!
However, that was not all that happened. But more of that later! Let’s look at why?
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Warm air rises and cool air sinks; a convection current forms in a room resulting from uneven heating and cooling
The solar heating is uneven and at different latitudes: more sunlight falls in equatorial regions than strikes the poles
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The Trade Windsand Westerly Windsblow across theOcean surface. Friction between these two fluids of different density drags the surface of the ocean along, forming slow-moving ocean currents that flow at approximately 45 to the direction of wind flow.
Atmospheric Circulation
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Oceanic Circulation
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Oceanic Circulation
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Ocean waves1. swell - waves of fairly
equal height, length, and period which form as storm-generated waves become sorted according to size and period as they move away from the storm's center. Swell, in the photograph of the Oceanside, California coast, can travel thousands of miles before breaking along a distant shore.
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2. local wind waves - generally smaller and less organized than swell, local wind waves can be superimposed onto swell, making the ocean surface chaotic. Surfers dislike these smaller waves, referring to them as "wind chop", because they mess up the uniform swell waves.
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3. wave interference - the interactions of two sets of swell can result in waves much smaller than usual (destructive interference) or much larger than usual (constructive interference). (The latter possibility can form dangerous rogue waves on the open ocean or so-called "creeper waves" along a beach.) Wave interference can also occur where an incoming wave reflects off of a jetty. The reflected wave can then interfere with the next incoming wave to form a peaked wave of great height, such as the Wedge at Newport Beach.
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4. wave refraction - occurs as as a portion of an incoming wave begins to interact with the ocean floor, slowing some of the wave and bending it in one direction or another. This can focus a wave's energy on a submerged reef, forming an excellent surf locale such as Jaws off the coast of Maui, Hawaii. More typically, the wave's energy is focused on a small rocky island (stack) or a headland that juts out into the ocean. This photograph shows the refraction of waves as they enter Bluff Cove along the shore of Palos Verdes Peninsula, California.