[ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/provenance", "@graph": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/assertion", "http://www.w3.org/ns/prov#wasAttributedTo": [ { "@id": "https://orcid.org/0000-0002-1784-2920" } ] } ] }, { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/assertion", "@graph": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/langhovde-basal-lead-time-2022", "@type": [ "https://w3id.org/sciencelive/o/terms/FORRT-Replication-Study", "https://w3id.org/sciencelive/o/terms/Replication-Study" ], "http://www.w3.org/2000/01/rdf-schema#label": [ { "@value": "Lead time of basal water pressure before glacier acceleration, Langhovde Glacier, January 2022 (exploratory, one event)" } ], "http://www.w3.org/2004/02/skos/core#related": [ { "@id": "http://www.wikidata.org/entity/Q179435" }, { "@id": "http://www.wikidata.org/entity/Q3962812" }, { "@id": "http://www.wikidata.org/entity/Q6486120" } ], "https://w3id.org/sciencelive/o/terms/hasDeviationDescription": [ { "@value": "There is no original methodology to reproduce: the question, and the three-model held-out test, were proposed by [name to be added with the researcher's agreement], who had not run it.\nDeviations from that proposed test:\n- one event only, so no held-out prediction across events (descriptive onset timing, lead–lag and a one-event hold-out instead);\n- speed and uplift come from GNSS positions smoothed with the processing of the earlier reproduction, extended with past-only (causal) and robust variants;\n- post hoc amendments, each dated and recorded:\n - the same smoother for all series;\n - a robust causal fit, after single-epoch GNSS outliers dominated the causal speed;\n - one base position and the base receiver's broadcast ephemeris in the kinematic processing;\n - bed-tilt onset labels withdrawn because the sensor was still settling." } ], "https://w3id.org/sciencelive/o/terms/hasDiscipline": [ { "@id": "http://www.wikidata.org/entity/Q52120" } ], "https://w3id.org/sciencelive/o/terms/hasMethodologyDescription": [ { "@value": "Exploratory analysis of one event, pre-registered step by step before each computation, with dated amendments.\nData:\n- the Sugiyama et al. (2026) deposit (Mendeley Data, doi:10.17632/8wvtxg53ry.1): 15 min GNSS positions, 1 min borehole pressure (BH2201), 10 min weather;\n- raw field data at the NIPR Arctic Data archive System (CC BY 4.0): 1 s GNSS from five receivers (A20220506-004), on-glacier air pressure (A20220506-001), and a 100 Hz accelerometer in borehole BH2201 (A20220506-002).\nThe deposit is parsed with the code of the earlier reproduction (doi:10.5281/zenodo.23257925).\nProcessing:\n- The raw GNSS is processed kinematically with RTKLIB 2.5.1 against a reference receiver on rock: forward filter only, so that no future data are used; GPS L1+L2; integer ambiguities fixed; checked against the published 15 min positions.\n- Basal pressure is corrected with the measured air pressure.\n- Every series is smoothed three ways: centred, causal (past data only) and robust causal Gaussian local-linear regression, at several bandwidths. Speed comes from the smoothed positions; acceleration from the speed.\nAnalysis:\n- Onsets are defined by declared rules (threshold exceedance at 2, 3 and 5 standard deviations of a pre-event day, persisting for 1 h; and a hinge change-point fit).\n- Leads are computed for every rule, bandwidth and reference window. A pre-registered majority rule with a 1 h tolerance labels each pair: basal leads, simultaneous, basal lags or indeterminate.\n- The detection delay of each causal speed estimator is measured on synthetic onsets with the observed noise and subtracted.\n- Further steps: lagged cross-correlation; lagged regressions for the three nested models, with rolling-origin and event hold-out evaluation; tests of the sub-daily speed variability (sidereal filtering for GNSS multipath, a tidal regression fitted before the event, a common-mode comparison with two further GNSS receivers); and bed-tilt series from the borehole accelerometer." } ], "https://w3id.org/sciencelive/o/terms/hasScopeDescription": [ { "@value": "Whether basal water pressure (and bed uplift) changes before the acceleration of grounded ice, tested on the one meltwater- and rain-driven speed-up at Langhovde Glacier, East Antarctica, that was observed with basal pressure, GNSS and weather together: 2–6 January 2022 (summer 2021/22).\n- In scope: the order and separation in time of the onsets of rain and melt, basal water pressure, bed uplift, bed tilt, and the speed and acceleration of a grounded and a floating GNSS station; the lead–lag structure between these series; and a descriptive version of the proposed comparison of three nested models (speed history; plus weather and melt; plus basal pressure and uplift).\n- Out of scope: the proposed held-out prediction across events. It needs several events with basal pressure, and this record has one, so it could not be run. Also out of scope: other glaciers or seasons, and the physical mechanism linking pressure and sliding." } ], "https://w3id.org/sciencelive/o/terms/targetsClaim": [ { "@id": "https://w3id.org/sciencelive/np/RAabNA0LyeNQVSDx1eVXRdbVXGd2qktH_w_aRxKBM7J3M" } ] } ] }, { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/pubinfo", "@graph": [ { "@id": "https://orcid.org/0000-0002-1784-2920", "http://xmlns.com/foaf/0.1/name": [ { "@value": "Anne Fouilloux" } ] }, { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA", "http://purl.org/dc/terms/created": [ { "@value": "2026-10-09T19:15:45.939Z", "@type": "http://www.w3.org/2001/XMLSchema#dateTime" } ], "http://purl.org/dc/terms/creator": [ { "@id": "https://orcid.org/0000-0002-1784-2920" } ], "http://purl.org/dc/terms/license": [ { "@id": "https://creativecommons.org/licenses/by/4.0/" } ], "http://purl.org/nanopub/x/introduces": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/langhovde-basal-lead-time-2022" } ], "http://purl.org/nanopub/x/wasCreatedAt": [ { "@id": "https://platform.sciencelive4all.org" } ], "http://www.w3.org/2000/01/rdf-schema#label": [ { "@value": "Lead time of basal water pressure before glacier acceleration, Langhovde Glacier, January 2022 (exploratory, one event)" } ], "https://w3id.org/np/o/ntemplate/wasCreatedFromTemplate": [ { "@id": "https://w3id.org/np/RAuLEjPp-4dTvPwMkfHggTto1CgjIftiGRAgHlyeEonjQ" } ] }, { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/sig", "http://purl.org/nanopub/x/hasAlgorithm": [ { "@value": "RSA" } ], "http://purl.org/nanopub/x/hasPublicKey": [ { "@value": "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" } ], "http://purl.org/nanopub/x/hasSignature": [ { "@value": "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" } ], "http://purl.org/nanopub/x/hasSignatureTarget": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA" } ], "http://purl.org/nanopub/x/signedBy": [ { "@id": "https://orcid.org/0000-0002-1784-2920" } ] } ] }, { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/Head", "@graph": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA", "http://www.nanopub.org/nschema#hasAssertion": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/assertion" } ], "http://www.nanopub.org/nschema#hasProvenance": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/provenance" } ], "http://www.nanopub.org/nschema#hasPublicationInfo": [ { "@id": "https://w3id.org/sciencelive/np/RAhiuIPJkGVJbzqG-It4rfLACd6yoRlHrUzkUBk1WWBZA/pubinfo" } ], "@type": [ "http://www.nanopub.org/nschema#Nanopublication" ] } ] } ]