Experimental investigation of the dynamics near the winter northern polar mesopause.
Bibliographic record
Abstract
An investigation of the dynamics near the winter northern polar mesopause has been carried out at the Early Polar Cap Observatory at Resolute Bay, Canada (74.9&deg;N, 94.9&deg;W). Tidal and planetary wave characteristics were studied using experimental and theoretical tools. The daily, monthly, and annual variations of the tidal field were studied using the 1995/1996 and 1996/1997 data. Ground-based measurements were obtained using a Fabry-Perot Interferometer with a Circle-to-Line Interferometric Optical system (FPI/CLIO) and an E-Region Wind Interferometer (ERWIN). The FPI/CLIO observed the Doppler winds of the OH emission near 86 km. The ERWIN provided simultaneous OH (86 km) and O<super>1</super>S (97 km) wind measurements. Monthly data were compared to the Global Scale Wave Model (GSWM) and the Forbes/Vial Solar Semidiurnal Tidal Model predictions. Additionally, a Global Empirical Vector Spherical Harmonics (VSH) Model was used to investigate the seasonal upper mesosphere and lower thermosphere tides. Classical tidal theory predicts that the winter polar region is relatively undisturbed by tides---oscillations of integral sub-harmonics of one day. Contrary to this theory, the semidiurnal (12 h) oscillation has been detected at Resolute. Analysis of this oscillation at 86 and 97 km, indicates that it is persistent and characteristic of a semidiurnal propagating tide. The research presented constitutes the first long-term study (&sim;3 months of data over 2 years) of the dynamical structure of the winter northern polar mesopause using optical instruments. Significant and new contributions include that the semidiurnal tide has been found to be highly variable in amplitude and phase from day to day. Planetary waves with periods near 5, 8, and 16 d are shown to modulate the semidiurnal amplitudes and background winds. In addition, non-linear interactions between planetary waves and the semidiurnal tide are detected near the polar mesopause. Spectral analysis reveal a variety of waves---tidal waves, planetary waves, and secondary waves as a result of non-linear wave interactions---which are geophysical and not attributed to spectral leakage.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".