Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Windows Vista -- Ignore unavailable to you. Want to Upgrade?

To: John F. Dowd who wrote (1693)	2/1/2007 12:52:30 PM
From: sammy™ -_-	Read Replies (1) \| Respond to of 1939

I'm not a meteorology major, with a lot of background in atmospheric science, but above the troposphere is what is known as the stratosphere, which is stable and remains constant and keeps the lower levels in check... The Tropopause © 2002 Eugene S. Takle The tropopause is the boundary between troposphere (which is based at the earth's surface and has temperature that decreases with height) and the stratosphere (which is a stable region of very low levels of vertical mixing above the troposphere). The tropopause is higher than the global average in warm regions (e.g., tropics) and lower in cold regions (e.g., polar regions). If the atmosphere is warming due to climate change, then we might expect the height of the tropopause to increase. Santer et al (2003) have reviewed data on tropopause heights and find that, indeed, it has increased over the period 1979-1999 by about 200 m. They use a global climate model to simulate this process and examine the impact of changes in greenhouse gases and ozone. Ozone absorbs UV radiation in the stratosphere, which provides heat to balance the heat loss due to infrared radiation. Reduced ozone levels means reduced heating and hence rise of the tropopause. Increased concentration greenhouse gases in the troposphere leads to increased absorption of infrared radiation throughout this region and also contributes to a rise in the tropopause. According to the global climate model used by Santer el al, (2003) these two factors can explain 80% of the rise in the tropopause height over the 20-year period they examined. More discussion on this research is supplied by Hoskins (2003). meteor.iastate.edu ww2010.atmos.uiuc.edu ................... Barbaro DOW