Atmosphere and Space Atmosphere The Atmosphere is the
- Slides: 76
Atmosphere and Space
Atmosphere � The Atmosphere is the layer of air surrounding the Earth � The gases in the atmosphere are important because: ◦ They block out dangerous rays from the sun, such as UV rays ◦ They stabilize the temperature across the Earth by retaining heat ◦ They include O 2, which is essential for cellular respiration, and CO 2, which is necessary for photosynthesis.
Atmosphere
Atmospheric Layers
Atmospheric Temperature
Atmospheric Protection
Atmospheric Pressure � Atmospheric pressure is cause by gravity pulling down the particles of the atmosphere � This is why atmospheric pressure decreases as you rise in the atmosphere. � 99% of the particles is present in the first 30 km above the surface � The atmosphere is considered to extend more than 10, 000 km above the surface
Composition of the Atmosphere � Air is a mixture of gases, especially nitrogen and oxygen, that makes up the atmosphere � 78% of air is Nitrogen � 21% of air is Oxygen � 1% of air is other gases � Water only makes up a small portion of the air, but is still very important
Composition of the Atmosphere
Composition of the Atmosphere
Comparing Earth to other Planets � Let’s compare Earth to the other terrestrial planets � Mercury � Venus � Mars
Our Solar System
Mercury
Mercury � Closest � Little planet to the sun to no atmosphere � Almost no magnetic field � Surface temperatures range from -173°C to ◦ 0. 6% of Earth’s 127°C
Venus
Venus � 2 nd closest planet to the Sun � Atmosphere mainly composed of CO 2 (96. 5%) and a little bit of N 2 (3. 5%) with traces of many other gases (SO 2, H 2 O, Ar, CO, He, Ne) � Atmospheric the Earth’s � No pressure is roughly 92 times that of magnetic field � Temperatures range from -270°C to 420°C
Mars
Mars � 4 th closest planet to the Sun � Very small atmosphere, about 0. 6% atmospheric pressure of the Earth’s � 95. 32 CO 2, 2. 7% N 2 and traces of Ar, O 2, NO, Ne, CO, H 2 O and, H 2 � No magnetic field � Temperatures range from -87°C to 20°C
Jupiter
Jupiter � 5 th planet from the Sun � Mainly composed of Hydrogen and Helium, possibly has a dense solid core � Spins so fast that it bulges at its equator � Its mass is 2. 5 times that of all of the other planets combined � If its mass would increase by about 150%, due to stronger gravitational forces, it would actually get smaller
Jupiter � Red spot of Jupiter ◦ There is a massive storm on Jupiter which is 24 -40, 000 km by 12 -14, 000 km which has been observed since at least 1831 � Jupiter has a very strong magnetic field, about 14 times as strong as the Earth � Has 66 natural satellites, most of which are less than 10 km in diameter � Average temperature is -108°C
Saturn
Saturn � 6 th planet from the Sun � Mainly composed of Hydrogen and Helium � Is also bulged at the equator due to it spinning � Is less dense than water (0. 69 g/cm 3) � May have a solid core, but scientists are unsure
Saturn � Rings of Saturn ◦ The rings extend from 6, 630 km to 120, 700 km above Saturn's equator, average approximately 20 meters in thickness and are composed of 93% water ice ◦ Size of the pieces range from dust to 10 m across � Has 62 moons surrounding it � Mean temperature of -139°C
Uranus
Uranus � 7 th planet from the Sun � Mainly composed of ice, some hydrogen and helium, and some rock � Not much is known of the composition of the planet � It is said to have a solid core
Uranus � Has a very unsual magnetic field which does not originate from its center � Has 9 vertical rings which range from 26 840 to 103 000 km in range � Has 27 known satellites � Mean temperature is -197°C
Neptune
Neptune � 8 th and furthest planet from the Sun � Atmosphere mainly composed of Hydrogen and Helium with a sheet of frozen water, ammonia and methane � Has a density of 1. 638 g/m. L � Has a solid rock core
Neptune � Neptune has a small ring system going from around 40 -60, 000 km from the surface of the Earth � Neptune � The has 13 known moons mean temperature of Neptune is -201°C
Atmospheric Circulation � Atmospheric circulation is the global-scale movement of the layer of air surrounding the Earth � The � This hot air rises and the cooler air drops is due to convection. � Without this movement, the temperature difference between the equator and the poles would be much greater
Coriolis Effect � The Coriolis effect change of the trajectory of air currents due to the rotation of the Earth � Without this effect, the wind would travel directly from the equator to the poles in a straight line
Coriolis Effect
Prevaling Winds � These are the winds which occur on the Earth. � They are due to a combination of all other factors � There are 3 pairs of cells with the jet stream between them.
Prevaling Winds
Prevaling Winds
Prevaling Winds
Strongest Earthquakes in History � � � � � May 22, 1960 Valdivia, Chile 1960 Valdivia earthquake 9. 5 March 27, 1964 Prince William Sound, Alaska, USA 1964 Alaska earthquake 9. 2 December 26, 2004 Indian Ocean, Sumatra, Indonesia 2004 Indian Ocean earthquake 9. 1– 9. 3 November 4, 1952 Kamchatka, Russia (then USSR) 1952 Kamchatka earthquakes 9. 0 March 11, 2011 Pacific Ocean, Tōhoku region, Japan 2011 Tōhoku earthquake 9. 0 November 25, 1833 Sumatra, Indonesia 1833 Sumatra earthquake 8. 8– 9. 2 (est. ) January 31, 1906 Ecuador – Colombia 1906 Ecuador-Colombia earthquake 8. 8 February 27, 2010 Maule, Chile 2010 Chile earthquake 8. 8 January 26, 1700 Pacific Ocean, USA and Canada 1700 Cascadia earthquake 8. 7– 9. 2 (est. ) July 8, 1730 Valparaiso, Chile 1730 Valparaiso earthquake 8. 7– 9. 0 (est. )
Air Masses � An air mass is a large expanse of the atmosphere with relatively uniform temperature and humidity � When two air masses collide, they do not simply combine � The cooler air mass slides below the warmer and the warmer air mass rises
Air Masses � Where warm and cold air masses collide is referred to as a front � Cold fronts occur when a mass of cold air meets a warm air mass � As the warm air rises it cools quickly and condenses into clouds � This produces puffy clouds called cumulus
Air Masses �A warm front is when a warm air mass meets a mass of cold air � In this case, the warm air rises more slowly forming light clouds called nimbostratus � On weather maps, cold fronts are represented by blue arrows and warm fronts are represented by red arrows
Cold Front
Warm Front
Anticyclones and Depressions � While most air masses move horizontally over the surface of the Earth, there is some vertical movement
Anticyclone � An area of atmospheric circulation surrounding a high pressure center � Clockwise for Northern hemisphere and counter-clockwise in the Southern hemisphere
Depression � An area of atmospheric circulation surrounding a low pressure center � Counter-clockwise for Northern hemisphere and clockwise in the Southern hemisphere
Depression � Strong depressions sometimes form over warm waters of tropical oceans �A huge spiral forms which can stretch up to 800 km across in diameter � Winds � These can blow up to 360 km/h storms can be called cyclones, hurricanes or typhoons depending on the region
Hurricanes � Hurricanes center have a characteristic eye in the ◦ Typically they are between 30 -65 km wide ◦ Can be as little as 3 km up to 670 km � The eye is generally calm and without clouds walls of the eye, the eyewall, are generally the tallest, strongest and most rainy parts of the hurricane
Hurricanes
Hurricanes
The Greenhouse Effect � What are greenhouse gases? ◦ Mainly water vapour (H 2 O), Carbon Dioxide (CO 2), Methana (CH 4) and Nitrous Oxide (N 2 O) ◦ They are present in the atmosphere and they act as a type of insulation to retain the heat around the Earth. � Without this effect, the Earth’s average temperature would be -18°C
How it works. . . � 1 - Most of the Sun’s rays reach the Earth’s surface and is absorbed by the ground � 2 - The heated ground sends infrared rays back into the atmosphere. A portion of the infrared rays pass through the atmosphere and are lost into space. � 3 - Greenhouse gases trap some of the rays and send them back to the Earth, further heating its surface
Greenhouse Effect
Intensification of the Greenhouse Effect � Over the last century, the levels of CO 2 have increased due to combustion of fossil fuels � Human activities have increased the production of CO 2 by billions of tonnes which is having a big effect on the environment � This is leading to climate change on the Earth
Intensification of the Greenhouse Effect � Methane, CH 4, has a 21 time greater effect on the greenhouse effect than CO 2, for the same volume � CH 4 comes from the digestion in farm animals, and decomposition of garbage and waste � N 2 O comes from the strong use of nitrogen rich fertilizers on farms
Climate Change � Climate change is defined as the abnormal modification of climatic conditions on Earth cause by human activity � From 1850 to 2005, the mean temperature on Earth has increased by 0. 76°C � Scientists believe that an increase of 2°C is the critical point at which serious climate disturbances would be inevitable � These include more droughts, heat waves, floods, and a rise in sea levels
Energy Resources � Wind Energy is the energy that can be drawn from the wind � Wind turbines are huge machines which turn with the wind and produce electricity � Wind is a renewable resource so wind turbines are considered to be environmentally friendly � Wind turbines do have a few negatives though
Bad wind turbines � People say that wind turbines ruin the natural beauty of the landscapes � Wind is not a reliable source of power since the winds are not predictable � Wind energy cannot be stored. Once the wind is gone, so is the electricity
Effect of the Sun and the Moon on the Earth � The Sun and the Moon are the two bodies in our solar system which most affect us � The Sun is vitally important because its energy provides us with light and heat � The Moon exerts gravitational forces upon the Earth which explains the tides.
The Sun
The Sun � The Sun is composed 75 percent of Hydrogen and 25 percent Helium � The temperature of the core reaches up to 15 million °C due to nuclear Fission ◦ Hydrogen being made into Helium � Light only takes 8 minutes to reach the Earth from the Sun ◦ The Earth is 150, 000 km away from the Sun
Solar Radiation � Solar radiation contains all of the waves in the electromagnetic spectrum � Only visible light, some infrared, and a small amount of UV light reach the surface of the Earth � Due to the curvature of the Earth, the equator receives much more heat than the polar regions
Solar Energy � The Earth receives enough energy in one hour from the sun to satisfy the world’s energy requirements for a year. ◦ Solar energy is the energy that comes from the Sun in the form of radiation through the atmosphere � Harnessing � There this energy is a huge challenge are a few ways that we can harness the power of the Sun
Using Solar Energy � Passive Heating Systems ◦ By positioning the house to take advantage of the Sun. � Photovoltaic Cells ◦ When the material that makes up the cells is hit by light, electrons are set into motion. This causes a current which can be used to power small appliances or an entire house � Solar Collectors ◦ These are sheets of glass which has copper pipes below it to absorb to heat up water or air for homes or water for a pool
The Moon
The Moon � The moon has been revolving around the Earth for billions of years � Its average diameter is 3476 km, which is roughly a quarter of the Earth � The theory behind the origin of the Moon is that the Earth was struck by a meteor the size of Mars. This caused part of the Earth to explode � The pieces reunited to form the Moon
The Moon � The Moon not only rotates around the Earth, but also rotates on its own axis. � These two movements are synchronised to that both rotations take the same amount of time (27. 3 days)
The Tides � Water masses on the side closest to the Moon are attracted to it � As a result, they will swell, forming a slight bulge in the Moon’s direction � Also, the waters on the opposite side of the moon get pulled towards the moon as well.
Tides
Tides
Tidal Energy � Tidal energy is the energy obtained from the ebb and flow of the tides � Works � When � The similarly to hydroelectric dam the tide come in, it fills a huge basin water remains there until the tide goes out again
Tidal Energy � The gate opens, releasing the basin of water to flow through the turbines � The turbine is set into motion, generating electricity � There are numerous advantages
Advantages � Produces � Entirely no greenhouse emissions renewable � Perfectly reliable since meteorologists can predict the ebb and flow of tides
Disadvantages � Building plants is complex and costly because they have to stand up to harsh conditions � There are few suitable sites in the world for building this type of power plant � There must be a tidal range of at least 5 meters
Tidal Energy
Tidal Energy
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