Carbon dioxide, water vapour and energy fluxes of a recently burned boreal jack pine stand in north-western Québec, Canada
Why this work is in the frame
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Bibliographic record
Abstract
The circumpolar boreal forest is an extensive carbon (C) reservoir, storing an estimated 88 petagrams (Pg) of C in vegetation biomass with an additional 471 PgC residing within the soil itself. In the North American boreal, fire disturbance acts as the main stand-renewing agent along an approximate 100-year return interval. However, recent studies suggest that fire intensity and severity are increasing, driven by disproportionate climate warming of the northern latitudes. In this study, we examine carbon dioxide (CO2), water vapour and energy exchange in a 7-year old, post-burn, jack pine stand located in the eastern James Bay region of the North American boreal; an area currently under-represented in fire studies. Over 1.5 years, covering two growing seasons and the spring and fall transitions, we measured net CO2 and energy exchange at the ecosystem level using an eddy covariance tower, and supplemented this with chamber measurements of soil respiration. The objectives of this study were to determine the environmental controls on the variability of the mass and energy fluxes. Net ecosystem exchange of CO2 (NEE) over the stand was typically small (-2.3 to 1 gC m-2 d-1), with respect to other young boreal stands, at times flipping between net uptake and release on a day-to-day basis. Annual cumulative NEE was determined to between +7 and -6 gC m-2 y-1, classifying it as approximately carbon-neutral. Cumulative ecosystem respiration and gross ecosystem productivity were smaller on an annual basis compared to other recently disturbed stands. The low productivity was associated with a lower vegetation abundance and LAI at the site due to very dry soil conditions. The increase in latent heat exchange (and decrease in sensible heat exchange) between growing seasons was determined to be primarily moisture-driven, with evaporation the dominant pathway. Little change in summertime albedo between years suggested that deciduous plant growth was not significant at the site.
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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) | 0.001 | 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) | 0.000 | 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 it