Reduced African Easterly Wave Activity with Quadrupled CO2 in the Superparameterized CESM
Abstract
African easterly wave (AEW) activity is examined in quadrupled CO2 experiments with the superparameterized CESM (SP-CESM). The variance of 2–10-day filtered precipitation increases with warming over the West African monsoon region, suggesting increased AEW activity. The perturbation enstrophy budget is used to investigate the dynamic signature of AEW activity. The northern wave track becomes more active associated with enhanced baroclinicity, consistent with previous studies. The southern track exhibits a surprising reduction of wave activity associated with less frequent occurrence of weak waves and a slight increase in the occurrence of strong waves. These changes are connected to changes in the profile of vortex stretching and tilting that can be understood as interconnected consequences of increased static stability from the lapse rate response, weak temperature gradient balance, and the fixed anvil temperature hypothesis.
- Authors:
-
- North Carolina State Univ., Raleigh, NC (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1438780
- Report Number(s):
- LLNL-JRNL-730891
Journal ID: ISSN 0894-8755
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Climate
- Additional Journal Information:
- Journal Volume: 30; Journal Issue: 20; Journal ID: ISSN 0894-8755
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Africa; Climate change; Climate models; Coupled models
Citation Formats
Hannah, Walter M., and Aiyyer, Anantha. Reduced African Easterly Wave Activity with Quadrupled CO2 in the Superparameterized CESM. United States: N. p., 2017.
Web. doi:10.1175/JCLI-D-16-0822.1.
Hannah, Walter M., & Aiyyer, Anantha. Reduced African Easterly Wave Activity with Quadrupled CO2 in the Superparameterized CESM. United States. https://doi.org/10.1175/JCLI-D-16-0822.1
Hannah, Walter M., and Aiyyer, Anantha. Sun .
"Reduced African Easterly Wave Activity with Quadrupled CO2 in the Superparameterized CESM". United States. https://doi.org/10.1175/JCLI-D-16-0822.1. https://www.osti.gov/servlets/purl/1438780.
@article{osti_1438780,
title = {Reduced African Easterly Wave Activity with Quadrupled CO2 in the Superparameterized CESM},
author = {Hannah, Walter M. and Aiyyer, Anantha},
abstractNote = {African easterly wave (AEW) activity is examined in quadrupled CO2 experiments with the superparameterized CESM (SP-CESM). The variance of 2–10-day filtered precipitation increases with warming over the West African monsoon region, suggesting increased AEW activity. The perturbation enstrophy budget is used to investigate the dynamic signature of AEW activity. The northern wave track becomes more active associated with enhanced baroclinicity, consistent with previous studies. The southern track exhibits a surprising reduction of wave activity associated with less frequent occurrence of weak waves and a slight increase in the occurrence of strong waves. These changes are connected to changes in the profile of vortex stretching and tilting that can be understood as interconnected consequences of increased static stability from the lapse rate response, weak temperature gradient balance, and the fixed anvil temperature hypothesis.},
doi = {10.1175/JCLI-D-16-0822.1},
journal = {Journal of Climate},
number = 20,
volume = 30,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 2017},
month = {Sun Oct 01 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
African Easterly Wave Dynamics in Convection‐Permitting Simulations: Rotational Stratiform Instability as a Conceptual Model
journal, January 2020
- Russell, James O. H.; Aiyyer, Anantha; Dylan White, J.
- Journal of Advances in Modeling Earth Systems, Vol. 12, Issue 1