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Is the Madden-Julian Oscillation a Moisture Mode?

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2023gl103002· OSTI ID:1992900
 [1];  [1]
  1. University of Wisconsin, Madison, WI (United States)
+ Show Author Affiliations
The governing thermodynamics of the Madden-Julian Oscillation (MJO) is examined using sounding and reanalysis data. On the basis of four objective criteria, results suggest that the MJO behaves like a moisture mode-a system whose thermodynamics is governed by moisture-only over the Indian Ocean. Over this basin, the MJO shows a slow convective adjustment timescale, its zonal scale is smaller, and it exhibits slow propagation, allowing moisture modes to exist. Elsewhere, the faster-propagating wavenumber 1-2 components are more prominent preventing weak temperature gradient (WTG) balance to be established. As a result, temperature and moisture play similar roles in the MJO's thermodynamics outside the Indian Ocean.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Archive
Sponsoring Organization:
National Oceanic and Atmospheric Administration (NOAA); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1992900
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 15 Vol. 50; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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