Development, Analysis and Evaluation of the LIFE Prototype Instrument
Bibliographic record
Abstract
There exists in the upper troposphere/lower stratosphere (UTLS) region of the atmosphere an identified observational gap in measurements, leading to large uncertainties in climate models. This region is crucial to understanding the climate of our planet due to the strong effect of dynamic, chemical and radiative processes within. In recent decades, infrared Fourier Transform Spectrometry has been identified as, and demonstrated to be, a prime candidate for remote sensing techniques with the necessary spectral, spatial and temporal resolution to combat the present scarcity of these critical observations through instruments such as MIPAS and GLORIA. The Limb Imaging Fourier Transform Spectrometer Experiment (LIFE) aims to build upon the legacy of these instruments with a design comprised of commercially available components and with greatly reduced complexity and cooling requirements, with minimal impact to measurement quality. This prototype instrument primarily targets the important greenhouse gases H$_2$O, O$_3$, CH$_4$ and N$_2$O and seeks to obtain vertical trace gas profiles for each by taking infrared measurements in the 700 to 1400 cm$^{-1}$ wavenumber range from a balloon-based platform. The design, characterization and calibration of the original instrument is the subject of a publication included in this work that details the instrument concept and operation, design principles and initial results from a 2019 demonstration flight from Timmins, Ontario. Additional aspects of the instrument design such as practical considerations, optical alignment challenges, and supporting technologies and hardware are discussed as well. Analysis of the measurements taken during the demonstration flight indicate a completion of primary scientific goals through the determination of vertical trace gas profiles for each of the target species and HNO$_3$ additionally, which was the subject of a second publication. Though comparison of the LIFE vertical trace gas profiles with credible trace gas profiles from the ACE and MLS instruments confirmed the results, a number of weaknesses and areas of improvement for successor instruments are detailed, which will allow further closing of the observational gap and ultimately contribute to a better understanding of the UTLS and the climate of the Earth.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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".