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Wieder einige interessante fakten frisch von der NOAA, NASA und ESA (kann ich leider nicht direkt verlinken da passwortgeschuetzt), die erwaermung des Mars hatte ich ja bereits angesprochen, aber Mars ist natuerlich nicht der einzige.
Das ganze zeigt einmal mehr, dass lediglich die ausgangsenergie der sonne entscheidend ist fuer einen wandel des klimas, nicht aber CO2.
Bitteschoen und viel spass beim lesen, wenn ihr schwierigkeiten beim uebersetzen habt koennt ihr ja gern nachfragen.
Jupiter:
A new storm and a new red spot on Jupiter hints at a rather quickly processing climate change. The mean temperatures have increased by as much as 10K at different places of the globe. At least close to the new spot and to the equator, these changes in temperature already show a severe change in Jupiter's climate and weather system.
Neptune:
The climate of Neptune - more precisely its reflectivity - has been constantly changing.. Lockwood and Hamel argue in Geophysical Research Letters, vol. 34 (2007) that the trends on Neptune reveal suggestive correlations of brightness of Neptune with the temperature trends on Earth, indicating their common solar origin. A mean global temperature increase of up to 2K indicates an even faster warming process than recorded on earth.
Triton:
Triton is Neptune's largest Moon. Global warming was first detected on Triton between 1989 and 1998, the temperature increased by approximately 5K.
Pluto:
Even though being the most remote planet in our solar system, there is evidence of global warming on Pluto. In addition, Pluto's atmospheric pressure has tripled within the last 14 years, and the associated increase of temperature is estimated to be around 3.5K, despite the motion of Pluto away from the Sun on its very eccentric ecliptic orbit.
Mars:
Of course, the process of global warming on Mars is a well-known story. Between 1975 and 2000, Mars' mean global temperature showed an increase of 0.65K, almost identical to what we record on our own planet Earth. This increase has already triggered an increased melting of the Martian polar icecaps. On a side note, 95% of Mars' atmosphere consists of carbon dioxide, compared to 0.038% in our atmosphere. If carbon dioxide really had such an immense role in climate as suggested by many environmentalists, the temperature increase on Mars should actually be in the reign of 17-20K.
Venus:
This planet doesn't belong to this list of planets where recent warming has been demonstrated to an extent over 0.5K. Nevertheless, it is interesting to talk about the "greenhouse effect" there. And compare it to what environmentalists have suggested is happening on earth.
Venus' distance from the Sun is about 70% of the distance Sun-Earth. Because of the second power, this means that it is subject to twice the amount of solar radiation. Because of the fourth power in the Stefan-Boltzmann law, it means that you expect about 20% higher temperatures in comparison with Earth on the Kelvin scale which would mean, if Venus were a black body, that the temperature would still be well below 100 Celsius. However, temperatures on Venus average at about 470 Celsius.
Venus is clearly not a black body and the greenhouse effect is important for reaching this temperature because of the following reasons: Venus' atmospheric density is 90 times higher than the terrestrial atmosphere, with a surface pressure of 9000kPa, and consists of 96% carbon dioxide! The Earth only has 380 parts per million of CO2, and if you divided it by 90 to get the corresponding fraction of the Venus atmosphere, you get about 4 parts per million. Hence, there is more than 100,000 times less CO2 density here than on Venus! Employing a linear relationship between the CO2 concentration and temperature boost, you would see that the expected increase of the Earth temperature due to CO2 is 400 Celsius divided by more than 100,000 which gives a few millikelvins in total difference - a totally negligible amount!
Dieser Beitrag wurde von Leshrac bearbeitet: 17. Juli 2007 - 21:40
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