Non-linear moisture-precipitation coupling and quantified precursors of extreme events over the Tibetan Plateau using decade-long hourly GNSS data

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Abstract
Highlights● TP PWV shows a rapid southeast-to-northwest decrease with summer peaks.● Diurnal PWV-precipitation coupling exhibits distinct phase lags across the TP.● Extreme precipitation triggering requires specific regionalized PWV thresholds.● PWV peaks serve as 1–2 hour lead-time precursors for extreme precipitation.