Rapport

Hey,

jeg er lige nu paa udveksling i USA, og har faktisk lige laert om det der i min physics class, lad mig give dig svaret paa ALBEDO..

Direkte fra bogen>>

The albedo is a measure of reflectivity of a surface or body. It is the ratio of electromagnetic radiation (EM radiation) reflected to the amount incident upon it. The fraction, usually expressed as a percentage from 0% to 100%, is an important concept in climatology and astronomy. This ratio depends on the frequency of the radiation considered: unqualified, it refers to an average across the spectrum of visible light. It also depends on the angle of incidence of the radiation: unqualified, normal incidence. Fresh snow albedos are high: up to 90%. The ocean surface has a low albedo. Earth has an average albedo of 37-39% whereas the albedo of the Moon is about 12%. In astronomy, the albedo of satellites and asteroids can be used to infer surface composition, most notably ice content. Enceladus, a moon of Saturn, has the highest known albedo of any body in the solar system, with 99% of EM radiation reflected.

Human activities have changed the albedo (via forest clearance and farming, for example) of various areas around the globe. However, quantification of this effect is difficult on the global scale: it is not clear whether the changes have tended to increase or decrease global warming.

The "classical" example of albedo effect is the snow-temperature feedback. If a snow covered area warms and the snow melts, the albedo decreases, more sunlight is absorbed, and the temperature tends to increase. The converse is true: if snow forms, a cooling cycle happens. The intensity of the albedo effect depends on the size of the change in albedo and the amount of insolation; for this reason it can be potentially very large in the tropics.

CO2, Nox og metangas..
Vand (H2O), kuldioxid (CO2), metan (CH4) og dinitrogenoxid (N2O, lattergas)

Kan det hjaelpe??

Tak for hjælpen :) Men du har vel ikke noget der forklarer stoffernes betydning?

Hmm...jeg ville da mene de to vigtigste luftarter i atmosfæren - i hvert fald dem der er mest af - er N2 og O2.

O2 betyder at vi kan trække vejret.

O3 er også meget vigtigt for det beskytter os i mod at få for meget uv-stråler af solen.

O3= ozon.

atmosfæren beskytter os også i mod meteorer.

jeg glemt lige at for tælle at Ozonlaget ligger i stratosfæren.

Atmosfæren opdeles i følgende "lag":

Troposfæren 0-7/17
Stratosfære 7/17-50
Mesosfære 50-80/85
Termosfære (herunder ionosfæren)80/85-640+
Exosfære ca. 700 - 5000
Magnetosfære 5000-60000+

Tallene efter navnet er i hvilken højde i kilometer laget ligger.
Grunden til at der er to tal nogen steder, er at der er højere til lagene ved ækvator end ved polerne. Laveste tal er ved polerne højeste ved ækvator og et eller andet sted i mellem de to tal for resten.

Håber det hjælper lidt.