Atmospheric Temperature and Pressure Measurements from the ACE-MAESTRO Space Instrument
Bibliographic record
Abstract
A method is developed and tested for determining atmospheric pressure and temperature from space using spectral absorption by the A and B bands of molecular oxygen as measured by the MAESTRO (Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) space instrument in solar occultation mode. MAESTRO is the UV-visible-near-infrared dual grating spectrometer component of the Atmospheric Chemistry Experiment (ACE) scientific payload, and was launched in August 2003 on the SciSat satellite to investigate atmospheric processes affecting the stratospheric ozone distribution. On-orbit measurements of pressure and temperature are desirable for accurate retrievals of other atmospheric constituents from the instrument, and as independent data products. The constant mixing ratio of molecular oxygen is exploited in these retrievals to derive atmospheric density profiles from oxygen absorption, and the density profiles are then converted to pressure and temperature using hydrostatic balance and the ideal gas taw. A highly accurate fast forward model is developed using a fast-line-by-line approach for modelling the high spectral resolution oxygen absorption lines, and a correlated-k technique is used to calculate analytic weighting functions for the retrieval of density. A global fitting algorithm is developed to simultaneously fit all spectra from one occultation. Retrieval characterization shows a small amount of information is added by the inclusion of the weaker B band to a retrieval using the strong A band absorption, and tests with real data show the B band retrievals alone are less sensitive to instrument characterization uncertainties and perform better than A band retrievals at altitudes below 30 km. The new algorithm is applied to 230 occultation observations collected in the Arctic winter, Arctic spring, and tropical regions, and during the Eureka 2004 and 2005 ACE validation campaigns in the high Arctic. Comparisons with profiles from the ACE-FTS (Fourier Transform Spectrometer), also on SciSat, coincident radiosondes, and meteorological analyses yield promising results, with biases between MAESTRO's and other profiles generally within 2-5%, in pressure and less than 5 K in temperature, and Ri1IS differences between 2-10% in pressure and 5-10 K in temperature.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 teacher head, 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".