. . . . . . "Lead time of basal water pressure before glacier acceleration, Langhovde Glacier, January 2022 (exploratory, one event)" . . . . "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- one base position and the base receiver's broadcast ephemeris in the kinematic processing;\n - bed-tilt onset labels withdrawn because the sensor was still settling." . . "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." . "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." . . . "Anne Fouilloux" . "2026-10-09T19:15:45.939Z"^^ . . . . . "Lead time of basal water pressure before glacier acceleration, Langhovde Glacier, January 2022 (exploratory, one event)" . . "RSA" . "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" . 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