Westward‐Propagating Moisture Mode Over the Tropical Western Hemisphere

نویسندگان

چکیده

A westward-propagating Rossby-like wave signal is found to explain a large fraction of the intraseasonal variance in cloud brightness over Western Hemisphere. series diagnostic criteria suggest that this moisture mode: its anomalies dominate distribution moist static energy (MSE) and are phase with precipitation anomalies; thermodynamic equation obeys weak temperature gradient approximation. The propagates westward due zonal advection by mean flow maintained radiative heating meridional advection. These properties compare favorably propagating Rossby mode an equatorial beta-plane model prognostic moisture, gradient, wind. results underscore importance water vapor dynamics slowly evolving tropical systems, limitations dry shallow theory rely on “reduced equivalent depth” represent dynamics.

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ژورنال

عنوان ژورنال: Geophysical Research Letters

سال: 2022

ISSN: ['1944-8007', '0094-8276']

DOI: https://doi.org/10.1029/2022gl097799