Role of convective mixing and evaporative cooling in shallow convection: Convective Mixing and Evaporative Cooling
Abstract
Large-eddy simulations of shallow convection are used to evaluate the role of convective mixing and evaporative cooling in the vertical transport of mass, heat, and moisture in nonprecipitating shallow convection. Evaporative cooling is found to increase mass flux and the magnitude of heat and moisture fluxes, comparing twin large-eddy simulations with either suppressed or active evaporative cooling. Nonetheless, subsiding shells transport mass downward even when evaporative cooling is suppressed, emphasizing that evaporative cooling is not the primary cause of existence of subsiding shells and accompanied buoyancy reversal. Instead, vertical convective mixing is found to be the primary reason of buoyancy reversal. Evaporative cooling yet accelerates downdrafts (updrafts) in the shell (cloudy) regions as well as increases the cloud cover in the lower cloud layer. The cloudy regions are more humid, and the liquid water potential temperature is lower compared to the evaporative-cooling-suppressed experiment. The primary effect of evaporative cooling is thus to increase the updraft core anomalies, thus enhancing vertical turbulent fluxes.
- Authors:
-
[1];
[2];
[1]
- Columbia Univ., New York, NY (United States)
- Cleveland State Univ., OH (United States)
- Publication Date:
- Research Org.:
- Columbia Univ., New York, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1533005
- Grant/Contract Number:
- SC0011094; SC0014203
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 10; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences
Citation Formats
Park, Seung-Bu, Heus, Thijs, and Gentine, Pierre. Role of convective mixing and evaporative cooling in shallow convection: Convective Mixing and Evaporative Cooling. United States: N. p., 2017.
Web. doi:10.1002/2017jd026466.
Park, Seung-Bu, Heus, Thijs, & Gentine, Pierre. Role of convective mixing and evaporative cooling in shallow convection: Convective Mixing and Evaporative Cooling. United States. https://doi.org/10.1002/2017jd026466
Park, Seung-Bu, Heus, Thijs, and Gentine, Pierre. Fri .
"Role of convective mixing and evaporative cooling in shallow convection: Convective Mixing and Evaporative Cooling". United States. https://doi.org/10.1002/2017jd026466. https://www.osti.gov/servlets/purl/1533005.
@article{osti_1533005,
title = {Role of convective mixing and evaporative cooling in shallow convection: Convective Mixing and Evaporative Cooling},
author = {Park, Seung-Bu and Heus, Thijs and Gentine, Pierre},
abstractNote = {Large-eddy simulations of shallow convection are used to evaluate the role of convective mixing and evaporative cooling in the vertical transport of mass, heat, and moisture in nonprecipitating shallow convection. Evaporative cooling is found to increase mass flux and the magnitude of heat and moisture fluxes, comparing twin large-eddy simulations with either suppressed or active evaporative cooling. Nonetheless, subsiding shells transport mass downward even when evaporative cooling is suppressed, emphasizing that evaporative cooling is not the primary cause of existence of subsiding shells and accompanied buoyancy reversal. Instead, vertical convective mixing is found to be the primary reason of buoyancy reversal. Evaporative cooling yet accelerates downdrafts (updrafts) in the shell (cloudy) regions as well as increases the cloud cover in the lower cloud layer. The cloudy regions are more humid, and the liquid water potential temperature is lower compared to the evaporative-cooling-suppressed experiment. The primary effect of evaporative cooling is thus to increase the updraft core anomalies, thus enhancing vertical turbulent fluxes.},
doi = {10.1002/2017jd026466},
journal = {Journal of Geophysical Research: Atmospheres},
number = 10,
volume = 122,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2017},
month = {Fri May 05 00:00:00 EDT 2017}
}
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Works referencing / citing this record:
Subsiding shells and the distribution of up- and downdraughts in warm cumulus clouds over land
journal, January 2019
- Mallaun, Christian; Giez, Andreas; Mayr, Georg J.
- Atmospheric Chemistry and Physics, Vol. 19, Issue 15