https://w3id.org/sciencelive/np/RAF0VQ4XaJBPc-9BUMoYnPnAxLA7z-UgBNidJVX2kR0Ck
.trig | .trig.txt | .jelly | .jelly.txt | .jsonld | .jsonld.txt | .nq | .nq.txt | .xml | .xml.txt
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sub:assertion {
sub:langhovde-meltwater-acceleration-study a <https://w3id.org/sciencelive/o/terms/FORRT-Replication-Study>,
<https://w3id.org/sciencelive/o/terms/Reproduction-Replication-Study>;
<http://www.w3.org/2000/01/rdf-schema#label> "Reproduction and partial replication of Sugiyama et al. (2026): meltwater, basal pressure and ice speed at Langhovde Glacier";
<http://www.w3.org/2004/02/skos/core#related> <http://www.wikidata.org/entity/Q360925>,
<http://www.wikidata.org/entity/Q3962812>, <http://www.wikidata.org/entity/Q571430>,
<http://www.wikidata.org/entity/Q6486120>;
<https://w3id.org/sciencelive/o/terms/hasDeviationDescription> """- Smoothing: the Methods state a Gaussian filter with a 1 h bandwidth, but the deposited code and published figures use 12 h, as identified from fig3.eps. 12 h is primary; 1, 3 and 6 h are reported.
- Atmospheric-pressure correction: the paper uses hourly air pressure from the on-glacier station, which is embargoed. The code's constant offsets are primary, with JMA Syowa hourly pressure as a sensitivity case.
- Tide: the deposit's tide file is in Syowa local time (UTC+3), and the authors shift it by 2.5 h. That shift is kept for the reproduction; the lag analysis uses UTC.
- Data gaps are detected from timestamps instead of hard-coded row numbers. This gives identical segments.
- Speed is differenced with the authors' schemes at 12 h (forward at GNSS2, centred at GNSS1) and centred at other bandwidths.
- The paper does not define \"background speed\"; four baselines are declared instead.
- Event windows come from the paper's text. The windows shaded in the authors' code are reported alongside.
- Correlations for the grounded boreholes, which the authors show only as a scatter plot, are computed.
- Rain frequency, air pressure and climate context use independent public records instead of the authors' extracts.""";
<https://w3id.org/sciencelive/o/terms/hasDiscipline> <http://www.wikidata.org/entity/Q52120>;
<https://w3id.org/sciencelive/o/terms/hasMethodologyDescription> """Reproduction (authors' data):
- Input: the Mendeley deposit (doi:10.17632/8wvtxg53ry.1), downloaded and checked against the repository's published SHA-256 checksums, and analysed with new Python code. The authors' MATLAB scripts serve only as a reference for file formats, constants and conversions.
- Pre-registration: a tolerance and decision rule for each sub-claim were committed in ANALYSIS_PLAN.md before analysis. Later changes are dated amendments, and every result is labelled pre-registered or post hoc.
- Pressure: borehole pressures are converted to water level and to a fraction of flotation as in the authors' code; the paper's Eq. 1 is reported alongside.
- GNSS: positions are projected to UTM zone 37S and smoothed with a Gaussian-kernel local linear regression. This reconstructs the authors' missing local_regression function, identified by matching the deposited fig3.eps. Horizontal speed is differenced from the smoothed positions. Data gaps are detected from the timestamps and optionally bridged with a not-a-knot cubic spline, as in the authors' supplementary figure.
- Speed-up: computed against four declared background-speed baselines (local, campaign median, campaign trend, 7-day running median), at smoothing bandwidths of 1, 3, 6 and 12 h, and compared with speed fluctuations outside the events.
- Tide: the authors' BH2203 correlation is repeated, then extended to the grounded boreholes with a 25 h high-pass filter and a lag scan. The clock of the tide file is checked against the IOC record of the same gauge.
Replication (independent data, each test pre-registered before its data were downloaded):
- Japan Meteorological Agency (JMA) Syowa daily weather summaries for rain frequency, 1990–2026, cross-checked against the same station's SYNOP reports in NOAA's Integrated Surface Database (WMO present-weather codes);
- JMA hourly station pressure for the borehole correction;
- JMA daily temperatures, and ERA5 2 m temperature from ECMWF's cloud-optimised archive, for the positive degree-day context;
- passive-microwave melt flags (SSM/I 25 km, AMSR 10 km) and Sentinel-2 NDWI for surface melt;
- an atmospheric-river catalogue (Favier 2025) for the January event;
- ITS_LIVE image-pair velocities, to test whether the speed-up can be detected independently.
The whole pipeline runs with pixi and Snakemake from a fresh checkout, and the GNSS processing is guarded by unit and regression tests.""";
<https://w3id.org/sciencelive/o/terms/hasScopeDescription> """The claim that surface meltwater reaching the bed accelerated grounded ice at Langhovde Glacier, East Antarctica, in summer 2021/22, tested through the observations it rests on:
- basal water pressure relative to the flotation level, and its rise during the January 2022 rain and melt event;
- the size of the speed-up at a grounded and a floating GNSS station during the December 2021 and January 2022 events;
- uplift of the grounded station and its absence on floating ice;
- the timing of the pressure and speed peaks;
- the tidal connection between the bed and the sub-shelf cavity, and the head difference to a borehole below the grounding line;
- the context that summer 2021/22 was unexceptional, with rare rain and no trend in temperature, positive degree-days or rain frequency.
The causal mechanism is assessed only through these observations. Out of scope, because no data were deposited: freshwater at the bed (CTD), borehole video, drone imagery, sub-shelf fauna, and changes in ocean forcing or buttressing.""";
<https://w3id.org/sciencelive/o/terms/targetsClaim> <https://w3id.org/sciencelive/np/RAm8LPD-uPRICSRaczUWa-k8dgyotonp8IdlG8kfAcFo0> .
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<https://orcid.org/0000-0002-1784-2920> <http://xmlns.com/foaf/0.1/name> "Anne Fouilloux" .
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dc:creator <https://orcid.org/0000-0002-1784-2920>;
dc:license <https://creativecommons.org/licenses/by/4.0/>;
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