Temperature Inversion

Can anyone explain briefly about Temperature inversion?

Hai Kumar,

A temperature inversion is a thin layer of the atmosphere where the normal decrease in temperature with height switches to the temperature increasing with height. An inversion acts like a lid, keeping normal convective overturning of the atmosphere from penetrating through the inversion.

This can cause several weather-related effects. One is the trapping of pollutants below the inversion, allowing them to build up. If the sky is very hazy, or is sunsets are very red, there is likely an inversion somewhere in the lower atmosphere. This happens more frequently in high pressure zones, where the gradual sinking of air in the high pressure dome typically causes an inversion to form at the base of a sinking layer of air.

Another effect that an inversion has is to make clouds just below the inversion to spread out and take on a flattened appearance. For instance, marine stratocumulus clouds over cold ocean waters; or the tops of thunderstorms when they reach the base of the stratosphere, which also forms a temperature inversion.

Regards !
Sudan

And related to ASIC design?

Good answer Sudan. That was my exact thought but as this is the digital IC forum I decided it means something else. I do analog design not digital but my guess would be that delay increases with temperature but you reach a temperature where the reverse starts to happen. Only a guess - hopefully someone can post the right answer!

Keith

Hi Kumar
We know that delay increases with increase in temp. because of increase in scattering....But from 45nm node and below,delay decreases upto a cerain point with increase in temp.