Loeb et al: Trend in EEI During the CERES Period

]]>As shown in presentation sheet 8

]]>From a presentation by Loeb et al. CERES-Libera Science Team Meeting, May 13, 2021 (Virtual Meeting)

The cloud longwave cooling has grown from 0,15 W/m2 in earlier work to 0,25 W/m2. With a bit longer timeserie (03/2000-02/2021)? ]]>

I have been working on maths problems for many years with a special interest [fixation] on Fermat’s theorem.

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That is no two positive integers to a power of 3 or greater can ever form a third integer to that same power.

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The answer, which would fit in the margins of a book as Fermat proposed is as follows

“The sum of two cubes is 2 identical cubes plus a gap

When the sum is a cube and the gap is a cube the first cube has to be two identical cubes

Yet two identical cubes can never be a cube.

Therefore the first cube can never be a cube if the gap and sum are cubes.

Only a non cube can add to a cube to make a cube

This proof applies to all powers 3 or greater.”

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I hope you do not mind me tucking it into your blog.

If it proves reasonable with no flaws please let me know.

You would expect nitrogen to not have any absorption in the IR because it is symmetric so the stretch vibrational mode does not change the dipole moment. However, there is what’s called collision induced absorption where the dipole moment is changed by collision with other molecules, resulting in a continuum absorption spectrum in the far IR. For radiation to and from the surface, this region of the spectrum is, IIRC, dominated by water vapor so it’s not important for energy transfer in the Earth’s atmosphere. It can be significant in paths that do not intersect the lower atmosphere, however. That could also apply to the Martian atmosphere. CIA is not strong, so I don’t know if there’s enough nitrogen in the Martian atmosphere for CIA to be significant. CIA is, of course, strongly dependent on atmospheric pressure.

Oxygen, OTOH, besides also having a collision induced continuum spectrum, also has a non-zero magnetic dipole moment. So it has absorption bands all across the spectrum. There aren’t, however, strong bands in the thermal IR so, as I remember, it does not significantly contribute to radiation transfer to and from the surface in the thermal IR.

]]>radiation going up and down?

The answer is of interrest relative to a Martian atmosphere of mostly CO2.. ]]>

On linearity of OLR.

Daniel D. B. Koll and Timothy W. Cronin: “Earth’s outgoing longwave radiation linear due to H2O greenhouse effect.

]]>“The authors do not seem to be aware about the “profound implications” you are talking about, and the global tone of the article is more a bored “yet another confirmation about something everyone already know”.”

You may be right in this, Ort. Perhaps Loeb and others don`t see some huge implications of this great sunshine global warming of the last 40 years. The big question is if this is is a stable feature and the outcome of known physical laws, or if it is part of some unknown natural variations. And it give the greenhouse gases another role in the big picture. Scientists have to come with a new explanation on the effect of CO2 on clouds.

Longwave radiation seems to be a predictable mechanism. There is a change in water vapor with surface warning that make the radiation a linear function of temperature. CO2 has a minor effect on this.

Shortwave cloud feedback is the wild card of climate science.

]]>From Loeb et al 2021: “This trend is primarily due to an increase in absorbed solar radiation associated with decreased reflection by clouds and sea-ice and a decrease in outgoing longwave radiation (OLR) due to increases in trace gases and water vapor”.

Are you sure you interpret correctly the paper?(genuine question, I do not have the skills to judge by myself)

The authors do not seem to be aware about the “profound implications” you are talking about, and the global tone of the article is more a bored “yet another confirmation about something everyone already know”.