Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation
Abstract
Marine shallow cumulus convection, often mixed with thin stratocumulus, is commonly aggregated into mesoscale patches. The mechanism and conditions supporting this aggregation are elucidated using 36 h large-eddy simulations (LES) on a 128 3 128 km doubly periodic domain, using climatological summertime forcings for a location southeast of Hawaii. Within 12 h, mesoscale patches of higher humidity, more vigorous cumulus convection, and thin detrained cloud at the trade inversion base develop spontaneously. Mesoscale 16 3 16 km subdomains are composited into quartiles of column total water path and their heat and moisture budgets analyzed. The weak temperature gradient approximation is used to explain how apparent heating perturbations drive simulated mesoscale circulations, which in turn induce relative moistening of the moistest subdomains, a form of gross moist instability. Self-aggregation is affected by precipitation and mesoscale feedbacks of radiative and surface fluxes but still occurs without them. In that minimal-physics setting, the humidity budget analysis suggests self-aggregation is more likely if horizontal-mean humidity is a concave function of the horizontal-mean virtual potential temperature, a condition favored by radiative cooling and cold advection within the boundary layer.
- Authors:
-
- Univ. of Washington, Seattle, WA (United States)
- Publication Date:
- Research Org.:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1511477
- Grant/Contract Number:
- SC0011602
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 8; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; cumulus convection; mesoscale organization; large‐eddy simulation; humidity feedback; mesoscale cellular convection; aggregation
Citation Formats
Bretherton, C. S., and Blossey, P. N. Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation. United States: N. p., 2017.
Web. doi:10.1002/2017ms000981.
Bretherton, C. S., & Blossey, P. N. Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation. United States. https://doi.org/10.1002/2017ms000981
Bretherton, C. S., and Blossey, P. N. Fri .
"Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation". United States. https://doi.org/10.1002/2017ms000981. https://www.osti.gov/servlets/purl/1511477.
@article{osti_1511477,
title = {Understanding Mesoscale Aggregation of Shallow Cumulus Convection Using Large-Eddy Simulation},
author = {Bretherton, C. S. and Blossey, P. N.},
abstractNote = {Marine shallow cumulus convection, often mixed with thin stratocumulus, is commonly aggregated into mesoscale patches. The mechanism and conditions supporting this aggregation are elucidated using 36 h large-eddy simulations (LES) on a 128 3 128 km doubly periodic domain, using climatological summertime forcings for a location southeast of Hawaii. Within 12 h, mesoscale patches of higher humidity, more vigorous cumulus convection, and thin detrained cloud at the trade inversion base develop spontaneously. Mesoscale 16 3 16 km subdomains are composited into quartiles of column total water path and their heat and moisture budgets analyzed. The weak temperature gradient approximation is used to explain how apparent heating perturbations drive simulated mesoscale circulations, which in turn induce relative moistening of the moistest subdomains, a form of gross moist instability. Self-aggregation is affected by precipitation and mesoscale feedbacks of radiative and surface fluxes but still occurs without them. In that minimal-physics setting, the humidity budget analysis suggests self-aggregation is more likely if horizontal-mean humidity is a concave function of the horizontal-mean virtual potential temperature, a condition favored by radiative cooling and cold advection within the boundary layer.},
doi = {10.1002/2017ms000981},
journal = {Journal of Advances in Modeling Earth Systems},
number = 8,
volume = 9,
place = {United States},
year = {Fri Oct 20 00:00:00 EDT 2017},
month = {Fri Oct 20 00:00:00 EDT 2017}
}
Web of Science
Works referenced in this record:
A Review of Mesoscale Cellular Convection
journal, October 1973
- Agee, E. M.; Chen, T. S.; Dowell, K. E.
- Bulletin of the American Meteorological Society, Vol. 54, Issue 10
What favors convective aggregation and why?: WHAT FAVORS CONVECTIVE AGGREGATION
journal, July 2015
- Muller, Caroline; Bony, Sandrine
- Geophysical Research Letters, Vol. 42, Issue 13
Large-eddy simulation of the transient and near-equilibrium behavior of precipitating shallow convection: LES OF PRECIPITATING SHALLOW CONVECTION
journal, December 2015
- Seifert, Axel; Heus, Thijs; Pincus, Robert
- Journal of Advances in Modeling Earth Systems, Vol. 7, Issue 4
Structure of the Mixed Layer and Inversion Layer Associated with Patterns of Mesoscale Cellular Convection During AMTEX 75
journal, December 1978
- Agee, Ernest M.; Lomax, Francis E.
- Journal of the Atmospheric Sciences, Vol. 35, Issue 12
A New Double-Moment Microphysics Parameterization for Application in Cloud and Climate Models. Part I: Description
journal, June 2005
- Morrison, H.; Curry, J. A.; Khvorostyanov, V. I.
- Journal of the Atmospheric Sciences, Vol. 62, Issue 6
Detailed Investigation of the Self-Aggregation of Convection in Cloud-Resolving Simulations
journal, August 2012
- Muller, Caroline J.; Held, Isaac M.
- Journal of the Atmospheric Sciences, Vol. 69, Issue 8
Moisture Transport, Lower-Tropospheric Stability, and Decoupling of Cloud-Topped Boundary Layers
journal, January 1997
- Bretherton, Christopher S.; Wyant, Matthew C.
- Journal of the Atmospheric Sciences, Vol. 54, Issue 1
Modeling Tropical Precipitation in a Single Column
journal, December 2000
- Sobel, Adam H.; Bretherton, Christopher S.
- Journal of Climate, Vol. 13, Issue 24
A Large Eddy Simulation Intercomparison Study of Shallow Cumulus Convection
journal, May 2003
- Siebesma, A. Pier; Bretherton, Christopher S.; Brown, Andrew
- Journal of the Atmospheric Sciences, Vol. 60, Issue 10
Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave
journal, July 1997
- Mlawer, Eli J.; Taubman, Steven J.; Brown, Patrick D.
- Journal of Geophysical Research: Atmospheres, Vol. 102, Issue D14
Aerosol Effects on Clouds, Precipitation, and the Organization of Shallow Cumulus Convection
journal, February 2008
- Xue, Huiwen; Feingold, Graham; Stevens, Bjorn
- Journal of the Atmospheric Sciences, Vol. 65, Issue 2
Three-dimensional numerical study of cell broadening during cold-air outbreaks
journal, December 1996
- Müller, Gerd; Chlond, Andreas
- Boundary-Layer Meteorology, Vol. 81, Issue 3-4
Cell Broadening Revisited: Results from High-Resolution Large-Eddy Simulations of Cold Air Outbreaks
journal, June 2005
- Schröter, M.; Raasch, S.; Jansen, H.
- Journal of the Atmospheric Sciences, Vol. 62, Issue 6
The distribution and variability of low-level cloud in the North Atlantic trades: Distribution and Variability of Low-level Cloud in the Trades
journal, February 2014
- Nuijens, L.; Serikov, I.; Hirsch, L.
- Quarterly Journal of the Royal Meteorological Society, Vol. 140, Issue 684
Objective Diagnostics and the Madden–Julian Oscillation. Part II: Application to Moist Static Energy and Moisture Budgets
journal, October 2015
- Wolding, Brandon O.; Maloney, Eric D.
- Journal of Climate, Vol. 28, Issue 19
Spatial Variability of Liquid Water Path in Marine Low Cloud: The Importance of Mesoscale Cellular Convection
journal, May 2006
- Wood, Robert; Hartmann, Dennis L.
- Journal of Climate, Vol. 19, Issue 9
A Composite Analysis of the Boundary Layer Accompanying a Tropical Squall Line
journal, February 1983
- Johnson, Richard H.; Nicholls, Melville E.
- Monthly Weather Review, Vol. 111, Issue 2
Mesoscale Fluctuations in Scalars Generated by Boundary Layer Convection
journal, March 1999
- Jonker, Harm J. J.; Duynkerke, Peter G.; Cuijpers, Joannes W. M.
- Journal of the Atmospheric Sciences, Vol. 56, Issue 5
Cloudiness and Marine Boundary Layer Dynamics in the ASTEX Lagrangian Experiments. Part II: Cloudiness, Drizzle, Surface Fluxes, and Entrainment
journal, August 1995
- Bretherton, Christopher S.; Austin, Philip; Siems, Steven T.
- Journal of the Atmospheric Sciences, Vol. 52, Issue 16
A New Cloud Physics Parameterization in a Large-Eddy Simulation Model of Marine Stratocumulus
journal, January 2000
- Khairoutdinov, Marat; Kogan, Yefim
- Monthly Weather Review, Vol. 128, Issue 1
Modeling Mesoscale Cellular Structures and Drizzle in Marine Stratocumulus. Part II: The Microphysics and Dynamics of the Boundary Region between Open and Closed Cells
journal, November 2009
- Wang, Hailong; Feingold, Graham
- Journal of the Atmospheric Sciences, Vol. 66, Issue 11
Radiative-convective instability: RADIATIVE-CONVECTIVE INSTABILITY
journal, February 2014
- Emanuel, Kerry; Wing, Allison A.; Vincent, Emmanuel M.
- Journal of Advances in Modeling Earth Systems, Vol. 6, Issue 1
Radiative-Convective Equilibrium with Explicit Two-Dimensional Moist Convection
journal, December 1993
- Held, Isaac M.; Hemler, Richard S.; Ramaswamy, V.
- Journal of the Atmospheric Sciences, Vol. 50, Issue 23
Observational Evidence for Relationships between the Degree of Aggregation of Deep Convection, Water Vapor, Surface Fluxes, and Radiation
journal, October 2012
- Tobin, Isabelle; Bony, Sandrine; Roca, Remy
- Journal of Climate, Vol. 25, Issue 20
The Mesoscale Stability of Entrainment into Cloud-Topped Mixed Layers
journal, January 1984
- Fielder, Brian H.
- Journal of the Atmospheric Sciences, Vol. 41, Issue 1
Eastward-Propagating Intraseasonal Oscillation Represented by Chikira–Sugiyama Cumulus Parameterization. Part II: Understanding Moisture Variation under Weak Temperature Gradient Balance
journal, February 2014
- Chikira, Minoru
- Journal of the Atmospheric Sciences, Vol. 71, Issue 2
Mesoscale organization, entrainment, and the properties of a closed-cell stratocumulus cloud: STRATOCUMULUS MESOSCALE ORGANIZATION
journal, September 2017
- Kazil, J.; Yamaguchi, T.; Feingold, G.
- Journal of Advances in Modeling Earth Systems, Vol. 9, Issue 5
Convective self-aggregation, cold pools, and domain size: AGGREGATION, COLD POOLS, AND DOMAIN SIZE
journal, March 2013
- Jeevanjee, Nadir; Romps, David M.
- Geophysical Research Letters, Vol. 40, Issue 5
Parametric representation of the cloud droplet spectra for LES warm bulk microphysical schemes
journal, January 2010
- Geoffroy, O.; Brenguier, J. -L.; Burnet, F.
- Atmospheric Chemistry and Physics, Vol. 10, Issue 10
Estimating the Gross Moist Stability of the Tropical Atmosphere*
journal, April 1998
- Yu, Jia-Yuh; Chou, Chia; Neelin, J. David
- Journal of the Atmospheric Sciences, Vol. 55, Issue 8
Marine low cloud sensitivity to an idealized climate change: The CGILS LES intercomparison: CGILS LES Intercomparison
journal, May 2013
- Blossey, Peter N.; Bretherton, Christopher S.; Zhang, Minghua
- Journal of Advances in Modeling Earth Systems, Vol. 5, Issue 2
Three Examples of Fair-Weather Mesoscale Boundary-Layer Convection in the Tropics
journal, October 1984
- LeMone, Margaret A.; Meitin, Rebecca J.
- Monthly Weather Review, Vol. 112, Issue 10
Large-Eddy Simulation: How Large is Large Enough?
journal, February 2004
- de Roode, Stephan R.; Duynkerke, Peter G.; Jonker, Harm J. J.
- Journal of the Atmospheric Sciences, Vol. 61, Issue 4
Aircraft Investigation of Mesoscale Cellular Convection During AMTEX 75
journal, May 1980
- Rothermel, Jeffry; Agee, Ernest M.
- Journal of the Atmospheric Sciences, Vol. 37, Issue 5
An Energy-Balance Analysis of Deep Convective Self-Aggregation above Uniform SST
journal, December 2005
- Bretherton, Christopher S.; Blossey, Peter N.; Khairoutdinov, Marat
- Journal of the Atmospheric Sciences, Vol. 62, Issue 12
Organization of Tropical Convection in Low Vertical Wind Shears: The Role of Water Vapor
journal, March 2001
- Tompkins, Adrian M.
- Journal of the Atmospheric Sciences, Vol. 58, Issue 6
Gravity Waves, Compensating Subsidence and Detrainment around Cumulus Clouds
journal, March 1989
- Bretherton, Christopher S.; Smolarkiewicz, Piotr K.
- Journal of the Atmospheric Sciences, Vol. 46, Issue 6
Marine boundary layer cloud regimes and POC formation in a CRM coupled to a bulk aerosol scheme
journal, January 2013
- Berner, A. H.; Bretherton, C. S.; Wood, R.
- Atmospheric Chemistry and Physics, Vol. 13, Issue 24
The role of precipitation and spatial organization in the response of trade-wind clouds to warming: WARMING RESPONSE OF SHALLOW CONVECTION
journal, June 2016
- Vogel, Raphaela; Nuijens, Louise; Stevens, Bjorn
- Journal of Advances in Modeling Earth Systems, Vol. 8, Issue 2
The Mechanics of Gross Moist Stability: GROSS MOIST STABILITY
journal, March 2009
- Raymond, David J.; Sessions, Sharon L.; Sobel, Adam H.
- Journal of Advances in Modeling Earth Systems, Vol. 1, Issue 3
Subtropical Low Cloud Response to a Warmer Climate in a Superparameterized Climate Model. Part II: Column Modeling with a Cloud Resolving Model: COLUMN MODELING OF SUBTROPICAL LOW CLOUD RESPONSE
journal, March 2009
- Blossey, Peter N.; Bretherton, Christopher S.; Wyant, Matthew C.
- Journal of Advances in Modeling Earth Systems, Vol. 1, Issue 3
Large-eddy simulation of organized precipitating trade wind cumulus clouds
journal, January 2013
- Seifert, A.; Heus, T.
- Atmospheric Chemistry and Physics, Vol. 13, Issue 11
Works referencing / citing this record:
Self-Aggregation of Deep Convection and its Implications for Climate
journal, January 2019
- Wing, Allison A.
- Current Climate Change Reports, Vol. 5, Issue 1
Cloud Ice Processes Enhance Spatial Scales of Organization in Arctic Stratocumulus
journal, December 2019
- Eirund, Gesa K.; Lohmann, Ulrike; Possner, Anna
- Geophysical Research Letters, Vol. 46, Issue 23
On Cold Pool Collisions in Tropical Boundary Layers
journal, January 2019
- Torri, Giuseppe; Kuang, Zhiming
- Geophysical Research Letters, Vol. 46, Issue 1
Understanding Negative Subtropical Shallow Cumulus Cloud Feedbacks in a Near‐Global Aquaplanet Model Using Limited Area Cloud‐Resolving Simulations
journal, June 2019
- Narenpitak, Pornampai; Bretherton, Christopher S.
- Journal of Advances in Modeling Earth Systems, Vol. 11, Issue 6
Understanding the Moisture Variance in Precipitating Shallow Cumulus Convection
journal, January 2020
- Anurose, T. J.; Bašták Ďurán, Ivan; Schmidli, Juerg
- Journal of Geophysical Research: Atmospheres, Vol. 125, Issue 1