Tuesday, January 29, 2013

Albedo refers to the percentage of solar radiation that is reflected from a surface. The energy not reflected is absorbed. Explain how paving a grass (high albedo) parking area with asphalt (low albedo) can contribute to climate change.

46 comments:

  1. Kelsie Kessick 2nd mod
    Paving a grass parking area with asphalt can make the climate possibly warmer. Since the asphalt attracts more heat instead of repelling the heat. The more asphalt parking areas, the warmer the climate will be.

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  2. Bridget Gray from 2nd mod says:
    The paving of grass can cause an affect on climate change because the grass reflects most light where as the concrete (paving) parking lot just absorbs it and remits it later on when it is cooler. This can lead to many things like the warming of the area and it also affects the urban heat island effect by warming up the area around it. therefore the suburban area's are not as hot and the cities are hotter and they are contributing more to global warming. This makes the climate change by warming it up and it is harder to cool the city once it is hotter than it is when it is cooler to heat up the city. The city therefore is heated up by a simple paving of grass no matter how big or small the parking lot is.

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  3. Paving a grass parking are with an asphalt parking area would make the area absorb more solar radiation. This making the area hotter than if it was kept as an grass parking area.The reasoning for this is because grass may have a high albedo of 15-25 percent, but it reflects most of that heat back out and asphalt has a low albedo of 5-10 percent all of that heat is trapped there. -Sean Back 2nd mod

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  4. Stephanie Wood 2nd mod
    Paving a grass area with asphalt would make the area attract more heat because asphalt has a lower albedo than grass. As a result of this, the Earth and the atmosphere can become much warmer which would effect the climate adversely.

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  5. If a grass area were to be paved with asphalt, less sunlight will be reflected back into space. Asphalt absorbs the sunlight and re-emits it as long waved infrared radiation. This radiation often gets trapped in the atmosphere and heats the earth's surface, leading to climate change.
    Kayla Payton 2nd mod

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  6. Sydney Swann-Burnett 2nd Period
    Because of the low absorption of grass the albedo is stronger, but when it comes to the dark colored asphault, much of the infrared radiation is held in it. The heat that is trapped is then later released but then is caught by the greenhouse gases trapping it inside the atmosphere. The large amount of heat being retained by teh asphault plus the fact it is beng blocked from being emitted back into the atmosphere causes what we know as Global Warming, or the heating of the atmosphere that causes such drastic changes as the melting of the ice caps and a decrease in cold weather environments.

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  7. Joyce Morris 2nd mod:

    If you pave an area of grass with pavement, it will most likely become warmer. This being because of the fact that grass does not attract and absorb as much heat as asphalt.

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  8. By paving over the grass parking lot with a concrete parking lot you have taken away the high albedo reflecting the suns rays and radiation that comes from the grass. Because grass has a higher albedo than concrete it can reflect more heat back out instead of holding it in i.e.(concrete). This will lead to higher temoperatures in the area causing all around hotter temperatures.

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  9. Paving the grass parking lot would turn the high albedo factor into a lower albedo. The new surface would be absorbing more of the suns rays rather than reflecting them. This means that the tempurature is going to increase with the new parking lot.

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  11. Lauren Brumfield/3rd Mod:
    Considering grass has a high albedo, covering that with dark asphalt will lower the albedo rate. This will change the allotted area from a cool area to a hot area due to the holding of heat in the asphalt. This contributes more to the greenhouse effect because of heat being trapped in the atmosphere (at a lower level). If the parking lot is located in a city (which is highly unlikely), it can contribute to the heat island effect, adding more heat into one area.

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  12. Alex Davis
    3rd mod
    Grass has a high albedo and a low absorption rate, which reflects most of the sun's radiation back out into the atmosphere. By covering up the grass with a material that absorbs, such as asphalt, will ultimatly heat he earth because the long waves remitted are trapped byt the greenhouse gases. By heating the earth the glacers will melt and everything will go wrong eventually resulting in the decline of the human race.

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  13. When an area of lower albedo and higher absorbtion absorbs solor radiation, it reemitts it later in the day. This causes these areas to be warmer, almost constantly, and can contribute to the heat of an area to create dangerously high temperatures. These surfaces also affect climate, and climate change, because of the additional warmth the low albedo surface provides. If paving over high albedo surface (and therefore replacing it with a low albedo surface), the area will become warmer and more significant to climate change in those ways.
    Caressa Mainland, 3rd mod student

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  14. Paving the grass parking lot would cause the albedo stronger. SInce grass is a relects back the radiation of the sun an dark color asphalt would trap the radiation from the sun within itself. After awhile the engery is release however it soon transfers in greenhouse gases. Trapping the engery in our atmosphere. Causing the warming of the air and the climate around us.By paving the grass parking lot and standing in the middle of it a person would notice the temperature was higher and hotter as when in a grass field it would be more humid this is the cause of the engery being move and some tranfered.

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  15. Paving a grassy area with asphalt has nothing but negative effects on the earth's atmosphere. Sure, you have a parking space, but asphalt has low albedo and a high rate of absorption, meaning it will trap the heat from the sun's energy rather than reflect it away from the earth's surface. This trapped heat is later reemited later in the day, causing a pocket of heat around the asphalt, also known as urban heat island effect. However, grass has a very low rate of absorption, and does not trap heat the way asphalt typically would. Grass would have the exact opposite effect of asphalt: the grass would keep the surrounding area cool, thus failing to contribute to the rising temperatures of earth's surface.

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  16. If you would pave a grassy area then it would seriously affect the climate change. Because a grassy area is so different from a asphalt because asp dethault has a higher albeado and it will cover up the heat in it's little cover from the suns energy instead of letting it go away from the earth's surface. then the held up heat will be let g o later that day. which would go to the aspphault and have the urban heat island effect. but the grass is not as high and that and will be almost the opposite and eventually after all the things are processed then the grassy area will have a cooler climate then the asphault.

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  17. Chris Brent
    4th mod
    Paving over a grass lot can affect the climate by causing heat island effects, because the albedo is so much different. It affects the green house gasses which affects the heat island effect which makes everything hotter. So the way to fix this is to stop paving so many grass lots and start planting more trees so that maybe we can reverse the affects.

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  18. This would not be a good thing to do for the Earth . Grass has high albedo. Asphalt has low albedo and if placed over the grass it would make the surface more warmer. Also, the asphalt asborbes more heat than grass. This will make the Earth more heated because the radiation will be trapped in greenhouse gases. Indidcatung that the temperatures of the Earth surface would go up.

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  19. paving a grass area will cause more damaging effcts than a grassy area. An asphalt area absorbs more heat than a grassy area. the grass has a low rate of absorbtion unlike an asphalt area it absorption rate is much higher. the grass keeps the area cooler than a asphalt area.

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  20. this is a bad idea because the grass contains water and will keep things cooler because it takes longer for the grass to heat up because of the water, the black top is going to be 100 percent dry in the dead heat of summer there is no water to keep it cool. the black top will heat up a lot faster and get a lot hotter because the color is darker.

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  21. Paving the grass area with a concrete parking area is going to make the area absorb more radiation. The dark surfaced parking lot is going to absorb the suns radiation because it has a low albedo. Because of its low albedo it gets really hot during the day and at night it is still going to be letting off heat to the area. This is an example of the urban heat island effect.

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  22. Tyler Lusk - 4th Mod
    When paving a lot that was previously grass, you are replacing something with a high albedo (Grass) with something with a low albedo (Asphalt) you are affecting climate change. Because the apshalt has a lower albedo it absorbs more energy resulting in a much hotter surface than the grass would be. This affects the Urban Heat Island Affect by making the surrounding area hotter, Greenhouse gasses are what keep the reflected light in earths atmosphere and keep the rays from entering space.

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  23. I feel that the climate would wouldget hotter becouse the air is so dry from the absorbed heat of the blacktop, that it will suck moisture out of the air to cool iitself.Albedo is the reflected amount of sunlight, with a black rooftop it absorbs alot

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  24. Katie Norman 3rd mod

    Because surfaces with lower albedo absorb more light than high-albedo surfaces, they also reemit more light in the form of infrared radiation. This particular form of energy can be trapped in the atmosphere by greenhouse gases. Therefore, surfaces which absorb more heat and emit more heat (like asphalt) contribute to the greenhouse effect and heat both the immediate area (as in an urban heat island) and the planet as a whole.

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  25. If a grassy area were to be paved with asphalt, the high Albedo will decrease because asphalt absorbs heat and hotter temperatures would occur in the area. so with this new parking lot the surrounding areas will become more hot and unbearable. Erik Back -5th mod

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  26. By changing a grass area parking space with asphalt you would be greatly increasing the amount of solar energy being absorbed in the area. Asphalt has a much higher albedo than grass. Since there would be a higher amount of energy being absorbed with the asphalt, there will be a higher amount of energy/heat being re-emitted into the surrounding area by the asphalt that was formally not being emitted by the grass. This would cause the area to be a much hotter place to be around then usual.

    Elijah McSweeney-2nd Mod

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  27. The grass parking area has a high albedo and reflects solar radiation better than an asphalt surface would. If it were to be replaced with a darker surface such as asphalt, solar radiation would be absorbed and heat will be released. Overall, the parking area will be hotter.

    -Gianna Pellegrini 3rd Mod

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  28. paving a grass area will cause more damaging effcts than a grassy area. Asphalt has low albedo and if placed over the grass it would make the surface more warmer.

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  29. Replacing a grass parking lot with aspahlt would make the albedo a lot higher because aspahlt absorbs a lot more solar energy than grass would. Aspahlt is darker and stays hotter for a longer amount of time. In general, the parking area would stay a lot hotter and for a longer amount of time.

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  30. Paving a once grassy area over with asphalt will have an effect on climate change for two major reasons. The first reason is because grass contains water which allows for absorbed heat to be cooled before it is re-emitted. The second reason is that asphalt is a surface with a higher albedo than grass, therefore it not only gets hotter than a grass surface would, but it then reflects that heat back into the atmosphere.

    Kennede Lewis
    - 4th Mod.

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  31. This comment has been removed by the author.

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  32. When you take out the grass which has a higher albedo the ability for the grass to reflect the sun light back into the atmosphere is gone. You now replace the grass with the asphalt which will absorb the suns energy and re-emit the energy as long wave radiation and increase the temperature of the entire area. This increases the urban heat island effect in that area.

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  33. Paving a grass parking lot (high albedo) with asphalt (low albedo) can contribute to climate change because the asphalt reflects more solar energy. Paving the grass with asphalt will raise the temperature due to the dark color of it. The sun will hit the asphalt and keep it warmer than the grass.

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  34. By paving a grass parking place with asphalt will make the solar energy rises. Paving grass over asphalt will rise the temperature.

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  35. Grass has a higher albedo than pavement. this means that grass reflects more of the solar energy than the pavement. By paving a grassy field, this means that more solar energy will be absorbed into the allotted area and by making the air warmer around the parking lot and changing the temperature of the area.

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  36. If you pave a grassy area it will cause it to absorb more solar energy, because grass has a higher albedo then pavement. If more energy is absorbed then it will cause the temperature around the paved area to rise.

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  37. The Grass has a Higher albedo than the pavement because it reflects some of the solar energy than the pavement would.If their was grassy areas around the pavement the temperature would not be so high, but if you did not the pavement would be much hotter due to low albedo.

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  38. Paving over a grassy area with asphalt can contribute to climate change due the fact that asphalt has a low albedo and absorbs most of the sunlight that hits it. After the light is absorbed, it is reflected back at a longer wavelength and becomes trapped in the atmosphere. While in the atmosphere, greenhouse gases catch the light, now long-wave radiation and it stays on Earth for longer periods of time. Therefore, the planet’s temperature increases and climate change can occur.

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  39. Paving over the grass parking lot with a concrete parking lot you have taken away the high albedo reflecting the suns rays and radiation that comes from the grass. Because grass has a higher albedo than concrete it can reflect more heat back out instead of holding it in. This will lead to higher temoperatures in the area causing all around hot temperatures.

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  40. Paving over grass would be a bad idea because it would contribute to the heat island effect.Therefore causeing the surface to get hotter then it would be with grass. Grass has high albedo and this causes wave lengths from the sun to be reflected back into the atmosphere. By paving over the grass we lose this and that is why it gets hotter.

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  41. Grass has a high albedo, and asphalt has a low albedo. Thus being, paving a grassy field would result in more solar energy being absorbed into the surronding area, which would contribute to climate change by making the temperature rise, which would then make the area warmer.

    -Karima Neghmouche, 2nd mod.

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  42. When you pave a place that once was grass, you get read of the good the grass did. If you put concrete where grass once was you end up with the concrete sucking up more heat, than the grass would have, and then slowly let it out all day and night. This is a problem because the heat the concrete lets off throughout the day gets trapped in our atmosphere by the green house effect.

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  43. Urban heat islands are caused by the heat absorption and reflectance from solar
    energy with dark surfaces, which can cause the temperature in urban areas to be significantly
    warmer in the summer months. This excess heat increases the peak energy demand, as people
    rely on air conditioning to cope, which contributes to elevated levels of greenhouse gas
    emissions and air pollution. It's obviously, a given that asphalt is indeed, black, and absorbs a lot of heat. Just imagine walking on a parking lot during a hot day in summer. You can even see the heat waves come off the asphalt. So by paving over a natural high albedo, with black tar, that will eventually turn into asphalt, of course the temperature will be raised a couple degrees, than what it would be without.

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  44. By paving a grass parking place with asphalt will possibly make the solar energy rises.Paving grass over asphalt will rise the temperature.due to the fact grass has a higher albedo .

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  45. Grass has higher albedo than asphalt, so if you pave a grassy feild more solar energy would be absorbed. Also, the asphalt asborbes more heat than grass. This will make the Earth more heated because the radiation will be trapped in greenhouse gases. Indidcatung that the temperatures of the Earth surface would go up.
    Hannah kirby 5th mod

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