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Title: Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy

Abstract

Abstract The moisture‐entrainment‐convection (MEC) feedback posits that a moist environment favors deep convection, which further moistens the atmosphere through its associated circulation and detrainment. The MEC feedback has been proposed to be crucial to spontaneous convective aggregation. Here we test this hypothesis by performing minimal cloud‐resolving simulations, without the buoyancy effect due to water vapor, evaporation of rain, or radiative and surface‐flux feedbacks. Convection can self‐aggregate in this minimal simulation, in which the MEC feedback is active. We then switch off this feedback by relaxing moisture to its horizontal mean over a time scale of 3 hr. Convection still self‐aggregates in this mechanism‐denial experiment, suggesting that the MEC feedback is not essential to self‐aggregation. We further show that convective heating coincides with positive temperature anomalies, generating available potential energy. Therefore, we propose that this convective heating‐overturning circulation feedback can lead to spontaneous development of large‐scale circulations.

Authors:
ORCiD logo [1]
  1. University of California Davis CA USA, Lawrence Berkeley National Laboratory Berkeley CA USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1567901
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Name: Geophysical Research Letters Journal Volume: 46 Journal Issue: 17-18; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

Citation Formats

Yang, Da. Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy. United States: N. p., 2019. Web. doi:10.1029/2019GL083805.
Yang, Da. Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy. United States. https://doi.org/10.1029/2019GL083805
Yang, Da. Mon . "Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy". United States. https://doi.org/10.1029/2019GL083805.
@article{osti_1567901,
title = {Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy},
author = {Yang, Da},
abstractNote = {Abstract The moisture‐entrainment‐convection (MEC) feedback posits that a moist environment favors deep convection, which further moistens the atmosphere through its associated circulation and detrainment. The MEC feedback has been proposed to be crucial to spontaneous convective aggregation. Here we test this hypothesis by performing minimal cloud‐resolving simulations, without the buoyancy effect due to water vapor, evaporation of rain, or radiative and surface‐flux feedbacks. Convection can self‐aggregate in this minimal simulation, in which the MEC feedback is active. We then switch off this feedback by relaxing moisture to its horizontal mean over a time scale of 3 hr. Convection still self‐aggregates in this mechanism‐denial experiment, suggesting that the MEC feedback is not essential to self‐aggregation. We further show that convective heating coincides with positive temperature anomalies, generating available potential energy. Therefore, we propose that this convective heating‐overturning circulation feedback can lead to spontaneous development of large‐scale circulations.},
doi = {10.1029/2019GL083805},
journal = {Geophysical Research Letters},
number = 17-18,
volume = 46,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1029/2019GL083805

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Cited by: 14 works
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