Anchoring Intraseasonal Air–Sea Interactions: The Moored Moist Static Energy Budget in the Indian Ocean from Reanalysis

• DOI: 10.1175/jcli-d-22-0182.1
• Publication Date: 2022-10-11T06:18:52Z
• Authors: Adam V. Rydbeck; Jonathan A. Chris...; Maria K. Flatau; Matthew A. Janiga; Tommy G. Jensen; Carolyn A. Reynolds; James A. Ridout; Travis A. Smith; Hemantha Wijesekera
• Keywords: Madden–Julian oscillation; Forcing (mathematics); Diurnal cycle; Sink (geography)

Abstract Moist static energy (MSE) and ocean heat content (OHC) in the tropics are inextricably linked. The processes by which sources sinks of OHC modulate column integrated MSE Indian Ocean (IO) explored through a reformulation budget using atmosphere reanalysis data. In reframed budget, interfacial air–sea turbulent radiative fluxes replaced for information on upper dynamics, thus “mooring” tendency to subsurface ocean. On subseasonal time scales, forcing is largely responsible amplification anomalies across IO, with basin average growth rates 10% day −1 . Local depletion leading contributor anomalous 12% Along equator, amplified vertical advection. only weakly reduces propagation (−2% ), predominantly resulting from (10% ). IO acts as an reservoir that expended during periods enhanced intraseasonal convection recharged suppressed convection. Because source periods, it offsets negative produced horizontal advection atmosphere. opposite effect occurs where sink counters positive