Maintenance of Moisture Anomalies Across Synoptic and Intraseasonal Timescales Over the Indo‐Pacific Warm Pool

Moisture variability plays a fundamental role in regulating tropical precipitation; however, the mechanisms that sustain moisture anomalies across different timescales remain unclear. This study examines how moisture anomalies are regulated over the Indo‐Pacific warm pool using the column‐integrated moist static energy (CMSE) budget. Spectral analysis is performed to reanalysis and satellite‐derived precipitation data for two frequency bands: synoptic (2–10‐day) and intraseasonal (20–60‐day). Results show that significant coherence between precipitation and CMSE occurs mainly at intraseasonal timescales along the equatorial warm pool (5°S–5°N, 80°E−150°E), whereas synoptic‐scale coupling is substantially weaker. Decomposition of the CMSE budget reveals that, at both timescales, horizontal and vertical advection act to damp moisture anomalies to a similar extent, while radiative heating and surface heat fluxes provide compensating sources that modulate regional variations. The net moisture tendency is nearly neutral because the opposing diabatic and advective processes effectively cancel each other, partly as a result of the spectral analysis methodology. Nonetheless, radiative heating and vertical advection exhibit spatial patterns that closely resemble the coherence between precipitation and CMSE and are associated with top‐heavy vertical velocity profiles. Further analysis indicates that strong upper‐tropospheric stability is a key factor in maintaining this top‐heaviness of the vertical velocity, while background wind fields modulate the meridional patterns of moisture mode emergence. These results suggest that the apparent moisture‐mode characteristics of intraseasonal disturbances arise primarily from environmental controls and their interactions with radiative and surface processes.