Stratospheric Cooling And Surface Retention

This document isolates one practical question: if the approximately ninety-year Gleissberg modulation is real, and if solar variability couples most strongly to the stratosphere through ultraviolet and electromagnetic modulation, then what is the expected direction of stratospheric temperature change during a low-amplitude Gleissberg phase and what does that imply for the temperatures experienced by humans near the surface?

Two commitments must be held at the same time. First, the Gleissberg modulation is cyclical and bounded; it must never be framed as a one-directional decline. Second, it is still measurable, and therefore it is legitimate to ask whether a lower-amplitude phase biases certain atmospheric layers slightly cooler or warmer, even if the effect is small.

Current mainstream atmospheric science repeatedly notes that solar variability has its largest direct radiative influence at ultraviolet wavelengths, which are largely absorbed in the stratosphere through ozone-related processes. The immediate coupling therefore appears in the stratosphere first, not at the surface.

On the solar side, long-record reconstructions used by mainstream agencies describe a Gleissberg-scale maximum in the mid-twentieth century and a decline in average activity thereafter, with recent decades described as a Gleissberg minimum. This is not a collapse; it is a bounded modulation of consecutive cycles.

If solar ultraviolet variability is reduced during a lower-amplitude Gleissberg phase, the simplest first-order expectation within the conventional framework is a small tendency toward cooler stratospheric temperatures, because less ultraviolet energy is deposited in the ozone-affected layers. This does not require any thermodynamic engine logic.

It is a boundary-coupling statement: reduced solar ultraviolet deposition produces reduced stratospheric heating.

However, the observed stratosphere does not respond only to solar modulation. Over the satellite era, multiple independent datasets show a long-term cooling trend in much of the stratosphere. Published analyses attribute this to a combination of radiative effects from increased greenhouse gases and changes in ozone, with large short-lived perturbations driven by volcanic injections and related chemistry. A recent example is the Hunga Tonga–Hunga Haʻapai eruption, which peer-reviewed work reports cooled global-average stratospheric temperatures by roughly 0.5-1.0 K during 2022-2023.

So the question, “Are we experiencing lower stratospheric temperatures now”, requires two answers at once. In the long view (multi-decadal), the stratosphere has generally cooled across the satellite era. In the short view (year to year), the stratosphere can fluctuate and even register slight increases in a given year. For example, the State of the Climate in 2024 report notes that global-mean temperatures in the lower, middle and upper stratosphere increased slightly in 2024. These are not contradictions. They describe a cooling background with superimposed variability.

Now to the mechanism you pointed to: inversion and retention. A cooler stratosphere can strengthen stratification near the tropopause, increasing the stability of the layer boundary that separates the troposphere (where humans live) from the stratosphere (where ultraviolet deposition and ozone processes dominate). When that boundary becomes more stable, vertical exchange can be reduced. In plain terms, a cooler top can act like a stronger lid.

That does not mean a cooler stratosphere automatically produces a warmer surface everywhere or at all times. It means the system can redistribute and retain heat differently. Under certain circulation states, strengthened stratification can bias the surface toward greater heat retention, even while the stratosphere cools. This is not a claim of thermodynamic forcing by the Sun. It is the description of a layered atmospheric response to electromagnetic modulation.

Within the bounded electromagnetic body framework, this layered behavior is expected. The Sun’s electromagnetic modulation couples most directly to the upper layers first. The atmosphere, functioning as a structured theater, then translates that modulation through gradients, refraction and stratified exchange. The key is that the response remains bounded and reversible, consistent with a non-consumptive solar identity.

Working timeline statements, expressed conservatively, can therefore be made without overreach. The mid-twentieth-century Gleissberg maximum is followed by decades of lower average solar activity, meaning the solar ultraviolet contribution to stratospheric heating is plausibly slightly reduced relative to that maximum. Over roughly the last fifty to seventy years, that would bias the stratosphere toward slightly cooler conditions than the mid-century peak, while leaving the door open for local and episodic exceptions driven by volcanic injections, dynamics and composition changes.

The conclusion is a layered one. The Gleissberg modulation can influence the stratosphere measurably but weakly; it does not impose a one-directional climate. The stratosphere can cool while the surface warms, because stratification and circulation govern how energy is retained and redistributed. The solar body remains coherent and bounded. The drift is bidirectional. The boundaries are maintained.

Produced by The Lilborn Equation Team:

Michael Lilborn-Williams

Daniel Thomas Rouse

Thomas Jackson Barnard

Audrey Williams