Bibliographic record
Abstract
One Free-Response Question (FRQ) on the Advanced Placement (AP) Environmental Science exam this spring addressed ozone (see On the web). Those knowledgeable about atmospheric chemistry might ask: or tropospheric? Well, the FRQ asked about both! Why is that tough? Most high school students, even those in advanced science classes, struggle to correctly distinguish between stratospheric ozone and tropospheric ozone. So, let's review. Strat ospheric ozone (aka good ozone) Part of our atmosphere's stratospheric layer contains a naturally high concentration of ozone ([O.sub.3]) molecules. These molecules are in a dynamic equilibrium with oxygen ([O.sub.2]) molecules--constantly decomposing and forming upon exposure to ultraviolet (UV) radiation. molecules absorb some UV radiation, reducing our exposure at the Earth's surface, where it can cause sunburns, skin cancer, and cataracts. Stratospheric ozone also mitigates UV radiation's inhibition of photosynthesis and plant growth (see On the web). The depletion of this good ozone layer by emissions of ozone-depleting substances (ODSs), such as chlorofluorocarbons, is of global concern. In 1987, the Montreal Protocol was passed to reduce ozone depletion. According to the 2010 assessment of the United Nations Environment Programme (UNEP), the protocol successfully controlled the global production and consumption of ODSs over the last two decades. Nevertheless, ozone depletion will continue for many more decades because several key ODSs last a long time in the atmosphere after emissions end (see On the web). Tropospheric ozone (aka bad ozone) In the troposphere--the lowest part of Earth's atmosphere--ozone forms as a secondary air pollutant. Fossil fuel combustion, among other activities, leads to ozone formation through a complex series of photochemical reactions. The United States Environmental Protection Agency (EPA) provides extensive information on ground-level ozone (see On the web). Bad tropospheric ozone causes throat irritation and worsens respiratory problems in humans and leaf damage and reduced growth in plants. Urban areas experience this ozone as a major component of photochemical smog. Classroom activitiies To further understand stratospheric ozone, send your students on the Ozone Hole Tour created by the Centre for Atmospheric Science at Cambridge University (see On the web). …
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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 | 0.003 | 0.024 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.005 | 0.006 |
| Open science | 0.001 | 0.003 |
| Research integrity | 0.004 | 0.005 |
| Insufficient payload (model declined to judge) | 0.086 | 0.021 |
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".