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Title: 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:
 [1];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (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. https://doi.org/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 = {2017},
month = {10}
}

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