Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation
Abstract
Organized rainstorms and their associated overturning circulations can self-emerge over an ocean surface with uniform temperature in cloud-resolving simulations. This phenomenon is referred to as convective self-aggregation. Convective self-aggregation is argued to be an important building block for tropical weather systems and may help regulate tropical atmospheric humidity and thereby tropical climate stability. Here the author presents a boundary layer theory for the horizontal scale λ of 2D (x, z) convective self-aggregation by considering both the momentum and energy constraints for steady circulations. This theory suggests that λ scales with the product of the boundary layer height h and the square root of the amplitude of density variation between aggregated moist and dry regions in the boundary layer, and that this density variation mainly arises from the moisture variation due to the virtual effect of water vapor. Furthermore, this theory predicts the following: 1) the order of magnitude of λ is ~2000 km, 2) the aspect ratio of the boundary layer λ/h increases with surface warming, and 3) λ decreases when the virtual effect of water vapor is disabled. These predictions are confirmed using a sui te of cloud-resolving simulations spanning a wide range of climates.
- Authors:
-
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of California, Davis, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Univ. of California, Berkeley, CA (United States)
- OSTI Identifier:
- 1433115
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Atmospheric Sciences
- Additional Journal Information:
- Journal Volume: 75; Journal Issue: 2; Related Information: © 2018 American Meteorological Society.; Journal ID: ISSN 0022-4928
- Publisher:
- American Meteorological Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Atmosphere; Buoyancy; Convection; Boundary layer; Climate change; Cloud resolving models
Citation Formats
Yang, Da. Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation. United States: N. p., 2018.
Web. doi:10.1175/JAS-D-17-0150.1.
Yang, Da. Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation. United States. https://doi.org/10.1175/JAS-D-17-0150.1
Yang, Da. Wed .
"Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation". United States. https://doi.org/10.1175/JAS-D-17-0150.1. https://www.osti.gov/servlets/purl/1433115.
@article{osti_1433115,
title = {Boundary Layer Height and Buoyancy Determine the Horizontal Scale of Convective Self-Aggregation},
author = {Yang, Da},
abstractNote = {Organized rainstorms and their associated overturning circulations can self-emerge over an ocean surface with uniform temperature in cloud-resolving simulations. This phenomenon is referred to as convective self-aggregation. Convective self-aggregation is argued to be an important building block for tropical weather systems and may help regulate tropical atmospheric humidity and thereby tropical climate stability. Here the author presents a boundary layer theory for the horizontal scale λ of 2D (x, z) convective self-aggregation by considering both the momentum and energy constraints for steady circulations. This theory suggests that λ scales with the product of the boundary layer height h and the square root of the amplitude of density variation between aggregated moist and dry regions in the boundary layer, and that this density variation mainly arises from the moisture variation due to the virtual effect of water vapor. Furthermore, this theory predicts the following: 1) the order of magnitude of λ is ~2000 km, 2) the aspect ratio of the boundary layer λ/h increases with surface warming, and 3) λ decreases when the virtual effect of water vapor is disabled. These predictions are confirmed using a sui te of cloud-resolving simulations spanning a wide range of climates.},
doi = {10.1175/JAS-D-17-0150.1},
journal = {Journal of the Atmospheric Sciences},
number = 2,
volume = 75,
place = {United States},
year = {Wed Jan 24 00:00:00 EST 2018},
month = {Wed Jan 24 00:00:00 EST 2018}
}
Figures / Tables:
Works referenced in this record:
Resolved Snowball Earth Clouds
journal, June 2014
- Abbot, Dorian S.
- Journal of Climate, Vol. 27, Issue 12
Global-scale convective aggregation: Implications for the Madden-Julian Oscillation: GLOBAL-SCALE CONVECTIVE AGGREGATION
journal, October 2015
- Arnold, Nathan P.; Randall, David A.
- Journal of Advances in Modeling Earth Systems, Vol. 7, Issue 4
MJO Intensification with Warming in the Superparameterized CESM
journal, April 2015
- Arnold, Nathan P.; Branson, Mark; Kuang, Zhiming
- Journal of Climate, Vol. 28, Issue 7
Moisture-radiative cooling instability: MOISTURE-RADIATIVE COOLING INSTABILITY
journal, October 2016
- Beucler, Tom; Cronin, Timothy W.
- Journal of Advances in Modeling Earth Systems, Vol. 8, Issue 4
Convective Self-Aggregation and Tropical Cyclogenesis under the Hypohydrostatic Rescaling
journal, January 2016
- Boos, William R.; Fedorov, Alexey; Muir, Les
- Journal of the Atmospheric Sciences, Vol. 73, Issue 2
Convective self-aggregation feedbacks in near-global cloud-resolving simulations of an aquaplanet: AGGREGATION FEEDBACKS IN NEAR-GLOBAL CRM
journal, November 2015
- Bretherton, Christopher S.; Khairoutdinov, Marat F.
- Journal of Advances in Modeling Earth Systems, Vol. 7, Issue 4
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
The Formulation and Atmospheric Simulation of the Community Atmosphere Model Version 3 (CAM3)
journal, June 2006
- Collins, William D.; Rasch, Philip J.; Boville, Byron A.
- Journal of Climate, Vol. 19, Issue 11
A coarsening model for self-organization of tropical convection: SELF-ORGANIZATION OF CONVECTION
journal, August 2013
- Craig, G. C.; Mack, J. M.
- Journal of Geophysical Research: Atmospheres, Vol. 118, Issue 16
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
Some simple solutions for heat-induced tropical circulation
journal, July 1980
- Gill, A. E.
- Quarterly Journal of the Royal Meteorological Society, Vol. 106, Issue 449
Moisture–convection feedback in the tropics
journal, October 2004
- Grabowski, W. W.; Moncrieff, M. W.
- Quarterly Journal of the Royal Meteorological Society, Vol. 130, Issue 604
Robust Responses of the Hydrological Cycle to Global Warming
journal, November 2006
- Held, Isaac M.; Soden, Brian J.
- Journal of Climate, Vol. 19, Issue 21
Horizontally Homogeneous Rotating Radiative–Convective Equilibria at GCM Resolution
journal, June 2008
- Held, Isaac M.; Zhao, Ming
- Journal of the Atmospheric Sciences, Vol. 65, Issue 6
Coupled radiative convective equilibrium simulations with explicit and parameterized convection: COUPLED RCE SIMULATIONS
journal, September 2016
- Hohenegger, Cathy; Stevens, Bjorn
- Journal of Advances in Modeling Earth Systems, Vol. 8, Issue 3
The sensitivity of convective aggregation to diabatic processes in idealized radiative‐convective equilibrium simulations
journal, January 2016
- Holloway, C. E.; Woolnough, S. J.
- Journal of Advances in Modeling Earth Systems, Vol. 8, Issue 1
Weakly Forced Mock Walker Cells
journal, September 2012
- Kuang, Zhiming
- Journal of the Atmospheric Sciences, Vol. 69, Issue 9
On the Role of Sea Surface Temperature Gradients in Forcing Low-Level Winds and Convergence in the Tropics
journal, September 1987
- Lindzen, Richard S.; Nigam, Sumant
- Journal of the Atmospheric Sciences, Vol. 44, Issue 17
On CO<SUB>2</SUB> climate sensitivity and model dependence of results
journal, January 1987
- Mitchell, Jfb; Wilson, Ca; Cunnington, Wm
- Quarterly Journal of the Royal Meteorological Society, Vol. 113, Issue 475
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
What favors convective aggregation and why?: WHAT FAVORS CONVECTIVE AGGREGATION
journal, July 2015
- Muller, Caroline; Bony, Sandrine
- Geophysical Research Letters, Vol. 42, Issue 13
On the Intepretation of the Gill Model
journal, August 1989
- Neelin, J. David
- Journal of the Atmospheric Sciences, Vol. 46, Issue 15
Response of the Superparameterized Madden–Julian Oscillation to Extreme Climate and Basic-State Variation Challenges a Moisture Mode View
journal, July 2016
- Pritchard, Michael S.; Yang, Da
- Journal of Climate, Vol. 29, Issue 13
The General Circulation of the Atmosphere
journal, May 2006
- Schneider, Tapio
- Annual Review of Earth and Planetary Sciences, Vol. 34, Issue 1
The Weak Temperature Gradient Approximation and Balanced Tropical Moisture Waves*
journal, December 2001
- Sobel, Adam H.; Nilsson, Johan; Polvani, Lorenzo M.
- Journal of the Atmospheric Sciences, Vol. 58, Issue 23
Radiative Constraints on the Hydrological Cycle in an Idealized Radiative–Convective Equilibrium Model
journal, January 2009
- Takahashi, Ken
- Journal of the Atmospheric Sciences, Vol. 66, Issue 1
Large-eddy simulation of subtropical cloud-topped boundary layers: 2. Cloud response to climate change: LES OF LOW CLOUDS UNDER CLIMATE CHANGE
journal, January 2017
- Tan, Zhihong; Schneider, Tapio; Teixeira, João
- Journal of Advances in Modeling Earth Systems, Vol. 9, Issue 1
Physical mechanisms controlling self-aggregation of convection in idealized numerical modeling simulations: SELF-AGGREGATION MECHANISMS
journal, February 2014
- Wing, Allison A.; Emanuel, Kerry A.
- Journal of Advances in Modeling Earth Systems, Vol. 6, Issue 1
Self-aggregation of convection in long channel geometry: Self-Aggregation in Channel Geometry
journal, September 2015
- Wing, Allison A.; Cronin, Timothy W.
- Quarterly Journal of the Royal Meteorological Society, Vol. 142, Issue 694
Triggered Convection, Gravity Waves, and the MJO: A Shallow-Water Model
journal, August 2013
- Yang, Da; Ingersoll, Andrew P.
- Journal of the Atmospheric Sciences, Vol. 70, Issue 8
A theory of the MJO horizontal scale: Yang and Ingersoll: The MJO Horizontal Scale
journal, February 2014
- Yang, Da; Ingersoll, Andrew P.
- Geophysical Research Letters, Vol. 41, Issue 3
Works referencing / citing this record:
A budget for the size of convective self‐aggregation
journal, February 2019
- Beucler, Tom; Cronin, Timothy
- Quarterly Journal of the Royal Meteorological Society, Vol. 145, Issue 720
Midwinter Arctic leads form and dissipate low clouds
journal, January 2020
- Li, Xia; Krueger, Steven K.; Strong, Courtenay
- Nature Communications, Vol. 11, Issue 1
Observational Relationship Between Entrainment Rate and Environmental Relative Humidity and Implications for Convection Parameterization
journal, December 2018
- Lu, Chunsong; Sun, Cheng; Liu, Yangang
- Geophysical Research Letters, Vol. 45, Issue 24
Self-Aggregation of Deep Convection and its Implications for Climate
journal, January 2019
- Wing, Allison A.
- Current Climate Change Reports, Vol. 5, Issue 1
The Multiscale Impacts of Organized Convection in Global 2-D Cloud-Resolving Models
journal, August 2018
- Brenowitz, N. D.; Majda, A. J.; Yang, Q.
- Journal of Advances in Modeling Earth Systems, Vol. 10, Issue 8
Convective Heating Leads to Self‐Aggregation by Generating Available Potential Energy
journal, September 2019
- Yang, Da
- Geophysical Research Letters, Vol. 46, Issue 17-18
Figures / Tables found in this record: