Application of a Monte Carlo solar radiative transfer modelin the McICA framework
Bibliographic record
Abstract
Large‐scale atmospheric models (LSAMs) that utilize the Monte Carlo Independent Column Approximation (McICA) have, thus far, paired McICA only with two‐stream approximations (TSAs) of the radiative transfer equation. In this study, the short‐wave TSA is exchanged for a Monte Carlo (MC) photon transport model. More than 44 000 domains of cloud properties retrieved from A‐Train satellite data, each measuring 256 km in length, were used to assess the noise characteristics of TSA‐ and MC‐based McICA models. It appears as though application of an MC algorithm in McICA will be both beneficial and tractable for LSAMs. This is because known levels of acceptable radiative noise produced by TSA‐based McICAs can be achieved with small numbers of MC photons. The greatest concern with the TSA McICA has been noise associated with heating rates for cloudy layers. But with as few as 500–1000 photons per simulation, the MC McICA reduces cloudy layer heating rate errors by typically ∼20%. Furthermore, since MC models can utilize detailed descriptions of cloud particle scattering phase functions and TSAs use only corresponding asymmetry parameters, TSA‐based McICAs, on average, overestimate all‐sky top‐of‐atmosphere reflected flux density at small solar zenith angles θ0 by ∼3 W m−2 and underestimate it at large θ0 by ∼1 W m−2; vice versa for surface net flux density. Systematic biases such as these are important when attempting to balance an LSAM's energy budgets and when making detailed estimates of radiative forcings due to anthropogenic activities.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".