Future projection of the African easterly waves in a high-resolution atmospheric general circulation model

Jerry Raj*, Hamza Kunhu Bangalath, Georgiy Stenchikov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Simulating the features of the African Easterly Waves (AEWs), such as their westward propagation off the east Atlantic coast, is challenging for coarse-resolution climate models. In this study, we use High-Resolution Atmospheric Model (HiRAM) to simulate AEWs and analyze their future projections by the end of the twenty first century. The simulations are performed globally at a horizontal resolution of ∼ 25 km. The model uses shallow convective parameterization for moist convection and stratiform cloudiness. Future projections are conducted using representative concentration pathway 8.5. The AEWs are separated with respect to their periods as 3–5- and 6–9-day period AEWs, and bandpass filtering is used to filter the waves from the mean flow. HiRAM simulates structure and propagation of the waves well; however, it tends to overestimate the associated precipitation. In the future, the AEW precipitation and intensity of the circulation will considerably increase. The northward extent of the AEW track also shows a significant increase in the future. Enhanced baroclinic overturning and eddy available potential energy generated due to diabatic heating is also observed in the future.

Original languageEnglish (US)
Pages (from-to)3081-3102
Number of pages22
JournalClimate Dynamics
Issue number7-8
StatePublished - Oct 2023

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).


  • African easterly waves
  • Future projection
  • High resolution GCM

ASJC Scopus subject areas

  • Atmospheric Science


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