This notebook series implements the Dew-Point Anchor Hypothesis (DPAH) using a Markovian state-space approach. Conventional climate models rely on top-down radiative forcing with surface temperature as the primary diagnostic. In contrast, DPAH treats the dew-point lifting condensation level (LCL) as an independent physical anchor. From this boundary, the tropospheric column is integrated downward using hydrostatic equilibrium and adiabatic processes.
\nRun401 establishes a clean, modular, vectorized Python skeleton (DPAHMarkovModel class) with:
\nThe stationary distribution converges rapidly to a physically realistic warm-moist attractor in the tropical ascent regime and a stable subtropical descent regime. Film suppression (0–10 %) has minimal impact on stationary temperature, demonstrating the strong negative feedback of the dew-point thermostat.
\nKey Results – Run401 v6 (film-suppression sweep)
\n| Regime | \nFilm Suppression | \nPeak T (K) | \nMean Stationary T (K) | \nNotes | \n
|---|---|---|---|---|
| Ascent | \n0.0 | \n297.5 | \n299.38 | \nSharp warm-moist ITCZ peak; P ≈ 1010 hPa, D ≈ 295 K, ELR ≈ 6–7 K/km | \n
| Ascent | \n0.05 | \n300.0 | \n300.91 | \nThermostat remains robust | \n
| Ascent | \n0.10 | \n300.0 | \n300.91 | \nStrong dew-point stabilisation confirmed | \n
| Descent | \n0.0 | \n305.0 | \n302.41 | \nRealistic subtropical high-pressure regime | \n
| Descent | \n0.05 | \n305.0 | \n303.47 | \nStable | \n
| Descent | \n0.10 | \n305.0 | \n303.47 | \nStable | \n
Pure physics diagnostic: Mean preferred_T ≈ 302.93 K (Ascent, film=0) – the Markov chain now faithfully follows the DPAH column integrator.
\nZenodo Deposit Notes
\nDew-Point Anchor Hypothesis (DPAH) Community
\nThe Dew-Point Anchor Hypothesis rests on a fundamental reversal of the conventional modelling hierarchy in climate and planetary science.
\nThe prevailing radiative paradigm begins with a vacuum surface as the a priori — a hypothetical airless body whose effective temperature (Teff) is calculated from absorbed solar radiation alone. An atmosphere is then added as a secondary modifying layer. This vacuum-first approach defines the logical structure, independent variables, and direction of reasoning used in mainstream models.
\nIn direct contrast, the Dew-Point Anchor Hypothesis begins with the atmosphere itself as the a priori reality — a physically complete, massive, and thermodynamically active system that exists from the outset. Within this atmosphere-first framework, the primary boundary condition is the observable phase-equilibrium altitude where a condensable volatile reaches saturation: the Lifting Condensation Level (LCL) for water vapour on Earth, or its frost-point or cloud-base equivalent on other planets. This anchor height (not the dew-point temperature itself) is fixed by Clausius–Clapeyron physics and is directly measurable.
\nFrom this LCL thermodynamic anchor, surface temperature, surface pressure, and the vertical thermal profile emerge as dependent variables, determined downward via the adiabatic lapse rate under hydrostatic equilibrium. Radiative processes operate within this anchored structure rather than defining the baseline itself.
\nBy treating the atmosphere as the foundational reality rather than an add-on to a fictional vacuum state, DPAH eliminates the circular reasoning inherent in Teff-based models and restores physical primacy to thermodynamics, mass, composition, and phase behaviour.
\nThis foundational distinction — atmosphere-first versus vacuum-surface-first — is the central commitment of the DPAH community.
\nOur mission is to develop, test, and refine this inverse, observation-driven modelling framework through open, transparent, and citable research. We welcome contributions that explore the implications of this conceptual shift for Earth’s climate, planetary atmospheres, and geoscientific modelling.
\nAll records in this community are versioned, openly accessible under CC BY 4.0, and permanently archived on Zenodo.
", "description": "Dew-Point Anchor Hypothesis community explores the Lifting Condensation Level as the primary thermodynamic boundary in tropospheric modelling: Surface temperature and pressure are codependent variables anchored by Clausius\u2013Clapeyron phase equilibrium", "page": "This community is dedicated to the Dew-Point Anchor Hypothesis (DPAH) and its natural extension, the Frost-Point Anchor Hypothesis (FPAH) — a unified, complementary framework for understanding planetary atmospheres.
\nThe central idea is that, in any atmosphere with a condensable volatile, the altitude of the Lifting Condensation Level (LCL) — or its equivalent frost-point / sublimation level on other planets — acts as the primary, observable thermodynamic anchor. Once fixed by fundamental physics (vapor-pressure equilibrium), this level determines the vertical thermal structure. Surface temperature and surface pressure then emerge as dependent variables governed by the adiabatic lapse rate and hydrostatic equilibrium under top-of-atmosphere energy balance (Atmospheric Thermal Effect — ATE).
\nKey Extensions and Applications:
\nTitan as a Hybrid Case: Titan’s methane cycle provides a compelling hybrid example. Methane precipitation occurs primarily in the liquid phase near the surface (DPAH-style), forming rivers, lakes, and seas of liquid hydrocarbons. At higher, colder altitudes or in polar winter conditions, frost/sublimation processes (FPAH) become relevant for methane and other hydrocarbons. This makes Titan an excellent testbed for the broader Phase-Change Anchor Framework.
\nTogether, DPAH and FPAH form a coherent framework that spans warm and cold environments across the solar system — from Earth thunderstorms and cirrus clouds to Venus, Mars, Titan, and Pluto.
\nThe community welcomes deposits of papers, technical notes, datasets, model outputs (including Python toolbox scripts), and discussion materials related to this hypothesis. It aims to foster open, evidence-based scientific debate across geoscience, atmospheric physics, climate modelling, and planetary science.
\nAll contributions are welcome, provided they are civil, properly referenced, and advance understanding of the role of condensation and phase-change physics in atmospheric structure.
", "title": "Dew-Point Anchor Hypothesis", "type": { "id": "topic" } }, "revision_id": 11, "slug": "dpah", "updated": "2026-06-12T21:52:25.394700+00:00" } ], "ids": [ "52fd08d6-2e2e-4e1f-a720-96804533404a" ] }, "id": "19961844", "pids": { "doi": { "client": "datacite", "identifier": "10.5281/zenodo.19961844", "provider": "datacite" } } }, "pids": { "doi": { "client": "datacite", "identifier": "10.5281/zenodo.19961845", "provider": "datacite" }, "oai": { "identifier": "oai:zenodo.org:19961845", "provider": "oai" } }, "revision_id": 8, "stats": { "all_versions": { "data_volume": 421130171.0, "downloads": 309, "unique_downloads": 300, "unique_views": 156, "views": 161 }, "this_version": { "data_volume": 421130171.0, "downloads": 309, "unique_downloads": 300, "unique_views": 156, "views": 161 } }, "status": "published", "swh": {}, "updated": "2026-05-15T15:04:47.226919+00:00", "versions": { "index": 1, "is_latest": true } }