Rolling 8-point (~24 h) Pearson correlation coefficient (r) between precipitable water vapor (pwatclm) and 2 m dewpoint temperature (dpt2m).

Description

The plot illustrates the temporal evolution of the rolling Pearson correlation coefficient (r) between precipitable water (PWAT, pwatclm) and 2-m dew point temperature (Td, dpt2m) using a window of 8 data points (~24 hours at 3-hourly resolution). Over the short observation period from 2025-12-07 00:00 to 2025-12-08 03:00 (n=10 points), the rolling r values are consistently high and positive, averaging 0.880 with minimal fluctuation (std=0.040), remaining well above the moderate correlation threshold of 0.5. Reference lines highlight r=0 (null correlation) and r=±0.5. The overall dataset correlation is strongly positive at r=0.920 (R²=0.846), indicating that PWAT robustly tracks variations in surface dew point temperature, reflecting coherent moisture dynamics in the atmospheric column and near-surface layer. This stability suggests reliable physical coupling without disruptions, valuable for model evaluation in meteorology or climatology.

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