Systematic occurrence cycle of typical RH-profiles during the MJO: evidence for ubiquitous pre-moistening

Abraham, Carsten, Goldblatt, Colin and Matthews, Adrian J. ORCID: (2023) Systematic occurrence cycle of typical RH-profiles during the MJO: evidence for ubiquitous pre-moistening. Geophysical Research Letters, 50 (20). ISSN 0094-8276

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We describe how typical relative humidity (RH) profiles change systematically through the phases of the Madden–Julian Oscillation (MJO). We use 18 years of classified RH-profiles from the Atmospheric Infrared Sounder, clustered without prior knowledge of large-scale dynamics or occurrence-region. Occurrence probability (OP) anomalies of RH-profiles classes exhibit classical MJO patterns: Large positive OP anomalies of the RH-profile class with most moisture in the free troposphere are co-located with the largest positive precipitation anomalies. About 10 days prior to this deep convective core large OP anomalies of a RH-profile class occur consistent with lower atmospheric moistening, supporting a ubiquitous role of pre-moistening in MJO propagation. Since each RH-profile class is associated with distinct dynamics (most of which are subgrid-scale to climate models) our results can serve as process-based diagnostics to investigate parameterization shortcomings of climate models preventing them to simulate the MJO accurately.

Item Type: Article
Additional Information: Research Funding: Flood Hazard Identification and Mapping Program; Canadian Space Agency; 16SUASOMTR; Natural Sciences and Engineering Research Council of Canada. Grant Number: RGPIN-2018-05929; Research Tools and Equipment. Grant Number: RTI-2020-00277; Natural Environment Research Council. Grant Number: NE/R016704/1
Uncontrolled Keywords: mjo,satellite observations,water vapor distribution,geophysics,earth and planetary sciences(all),sdg 13 - climate action ,/dk/atira/pure/subjectarea/asjc/1900/1908
Faculty \ School: Faculty of Science > School of Natural Sciences
Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 26 Sep 2023 09:30
Last Modified: 24 Oct 2023 01:41
DOI: 10.1029/2023GL104991


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