Sentences with phrase «um radiation»

The upper graph, showing down - looking readings at the top of the atmosphere shows that approximately 1/2 of the 15 um radiation is absorbed.

And any 15 um radiation from the even warmer ground is ALSO absorbed by the intermediate layers.

For instance, as mention above, there are well known excitation modes in CO2 with an energetic value equivalent to 15 um radiation.

Now, add a source at greater than 15C (like a warm earth surface) and ad long as the rate of incoming 15 um radiation is greater than the 15 um radiation rate you already measured from your hohlraum there will be disequilibrium and the temperature of the hohlraum (not just the CO2 but all of the gas) will increase until the hohlraum is again emitting the same amount of 15 um radiation as is coming in.

In your hohlraum thought experiment the enclosed volume likely would emit the same amount of 15 um radiation as it absorbed, though your setup wouldn't find that detail.

If an object (for example, an N2 molecule) is going to collide with a CO2 molecule and excite it with to an excited state that N2 molecule has to have translational energy equivalent to at least 15 um radiation and the impact must occur with exactly the right impact parameter for the reaction to occur.

Not exact matches

«Our preclinical data suggest that combining low doses of these inhibitors will enhance the clinical effects of both drugs as a potential treatment for patients with AML,» says the senior author, Feyruz V. Rassool, PhD, associate professor of radiation oncology at the University of Maryland School of Medicine (UM SOM) and a researcher at the University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center (UMGCCC).

Note how less radiation comes from the 13 - 17 um band; this is because it comes from higher up, around the tropopause where it is colder — note the coloured temperature curves.

graph 2 «99 % of sun's radiation fall between 0.2 — 5.6 um; 80 % — 0.4 — 1.5 um» and those wavelengths have an energy peaking at 10 ^ 9 times as much energy at the visible wavelengths compared to the peak energy of the infrared wavelengths emitted by the earth.

There's very little radiation of either solar or thermal origin around 2.6 um and around 4 um it's not near IR any more and almost totally of thermal origin.

Also, I could not find any correctly conducted experiments (tests & measurements) that would somehow prove to me that the warming properties of CO2 (by trapping earth's radiation between the wavelengths 14 - 15 um) are greater than its cooling properties (by deflecting sunlight at various wavelengths between 0 — 5 um).

So we can imagine that when some of earth's radiation hits on the CO2 at 14 - 15 um it will be send back to earth.

Both gases have spectra showing absorptions in the 0 - 5 um range meaning it also causes cooling by deflecting radiation from the sun.

These are two gases that would trap radiation from earthshine between 13 and 15 um, causing warming, bottum up.

Also, I think the actual heat caused by the sun's IR at 4 - 5 may be underestimated, e.g. the radiation of the sun between 4 and 5 um may only be 1 % but how many watts / m2 does it cause?

EVEN IF we attribute ALL that radiation between 8 - 14 um to N2 & O2, the much more common N2 & O2 molecules are emitting much less energy.

Looking up into the sky, it is clear that SOMETHING is emitting close to a BB radiation curve @ ~ 265 K (the atmospheric temperature near the surface), but only above ~ 14 um or below ~ 8 um (which happens to be where H2o & CO2 emit well).

In fact, the very image you reference at http://www.sundogpublishing.com/fig8-2.pdf shows that there is almost no radiation coming down at 8 - 12 um.

I don't know, but I suspect, that even the radiation between 8 - 14 um is not due primarily to N2 or O2, but rather to GHGs (possibly CO2 or H20, but potentially also O3, CH4...).

Multiple sources suggest that the energy from BB radiation at ~ 5700 K (eg from the sun) will be ~ 10 UV, ~ 40 % visible, ~ 45 % IR - A & IR - B (0.7 — 3 um), and ~ 5 % «thermal IR» (3 um and longer).