Preprints
https://doi.org/10.5194/egusphere-2024-3150
https://doi.org/10.5194/egusphere-2024-3150
21 Oct 2024
 | 21 Oct 2024

Weather systems associated with synoptic variability in the moist margin

Corey Michael Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen

Abstract. The moist margin is a sharp gradient of humidity that separates the moist deep tropics from the drier subtropics, and its movement is known to have an important effect on rainfall variability. In this work, we investigate how weather systems are related to synoptic variability in the moist margin. The weather systems considered include convectively coupled equatorial waves and the Madden-Julian Oscillation (MJO), monsoon low-pressure systems (LPS), and extratropical interactions with the moist margin characterised by upper-level potential vorticity (PV). We use an object-based approach in which first, objects are defined to describe the variability of the moist margin, and then are related to weather objects representing the above weather systems. Overall, the results indicate that these weather systems are associated with a large proportion of variability in the moist margin. The MJO and equatorial Rossby wave have a significant modulating effect on the moist margin. In comparison, monsoon LPS are infrequent but strongly influence the moist margin when they occur. Interactions with the extratropics occur for around one quarter of moist margin perturbations, and display a clear wave-like signal, often with anticyclonic PV anomalies near the perturbed margin and cyclonic PV anomalies remotely. Overall, objects associated with weather systems are larger, longer-lived, and precipitate more, highlighting the important role of weather systems.

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Journal article(s) based on this preprint

07 Apr 2025
Weather systems associated with synoptic variability in the moist margin
Corey Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen
Weather Clim. Dynam., 6, 369–385, https://doi.org/10.5194/wcd-6-369-2025,https://doi.org/10.5194/wcd-6-369-2025, 2025
Short summary
Corey Michael Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Corey Robinson on behalf of the Authors (14 Jan 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (26 Jan 2025) by Dariusz Baranowski
RR by Anonymous Referee #2 (07 Feb 2025)
RR by Andries Jan De Vries (09 Feb 2025)
ED: Publish as is (10 Feb 2025) by Dariusz Baranowski
AR by Corey Robinson on behalf of the Authors (10 Feb 2025)

Post-review adjustments

AA: Author's adjustment | EA: Editor approval
AA by Corey Robinson on behalf of the Authors (04 Apr 2025)   Author's adjustment   Manuscript
EA: Adjustments approved (07 Apr 2025) by Dariusz Baranowski

Journal article(s) based on this preprint

07 Apr 2025
Weather systems associated with synoptic variability in the moist margin
Corey Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen
Weather Clim. Dynam., 6, 369–385, https://doi.org/10.5194/wcd-6-369-2025,https://doi.org/10.5194/wcd-6-369-2025, 2025
Short summary
Corey Michael Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen
Corey Michael Robinson, Sugata Narsey, Christian Jakob, and Hanh Nguyen

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Short summary
Rainfall in the tropics is strongly related to the amount of moisture in the atmosphere. In this work, we examine a measure of moisture called the ‘moist margin’, which describes a transition between rainy and clear regions of the tropics. We show that movement of the moist margin is often related to a variety of weather systems. Cases where tropical moisture moves far poleward are often related to low-pressure systems or large-scale waves in the extratropics.
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