Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign
Abstract
This paper investigates the mechanisms of convective cloud organization by precipitation-driven cold pools over the warm tropical Indian Ocean during the 2011 Atmospheric Radiation Measurement (ARM) Madden-Julian Oscillation (MJO) Investigation Experiment / Dynamics of the MJO (AMIE/DYNAMO) field campaign. A high-resolution regional model simulation is performed using the Weather Research and Forecasting model during the transition from suppressed to active phases of the November 2011 MJO. The simulated cold pool lifetimes, spatial extent and thermodynamic properties agree well with the radar and ship-borne observations from the field campaign. The thermodynamic and dynamic structures of the outflow boundaries of isolated and intersecting cold pools in the simulation and the associated secondary cloud populations are examined. Intersecting cold pools last more than twice as long, are twice as large, 41% more intense (measured by buoyancy), and 62% deeper than isolated cold pools. Consequently, intersecting cold pools trigger 73% more convective clouds than isolated ones. This is possibly due to stronger outflows that enhance secondary updraft velocities by up to 45%. However, cold pool-triggered convective clouds grow into deep convection not because of the stronger secondary updrafts at cloud base, but rather due to closer spacing (aggregation) between clouds and larger cloud clustersmore »
- Authors:
-
- Pacific Northwest National Laboratory Richland Washington USA
- Department of Atmospheric Sciences University of Washington Seattle Washington USA
- College of Earth, Ocean, and Atmospheric Sciences, Oregon State University Corvallis Oregon USA
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1295970
- Alternate Identifier(s):
- OSTI ID: 1197088; OSTI ID: 1295971
- Report Number(s):
- PNNL-SA-105094
Journal ID: ISSN 1942-2466
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Published Article
- Journal Name:
- Journal of Advances in Modeling Earth Systems
- Additional Journal Information:
- Journal Name: Journal of Advances in Modeling Earth Systems Journal Volume: 7 Journal Issue: 2; Journal ID: ISSN 1942-2466
- Publisher:
- American Geophysical Union (AGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; convective cloud; AMIE/DYNAMO Field Campaign; cold pools; tropical warm ocean
Citation Formats
Feng, Zhe, Hagos, Samson, Rowe, Angela K., Burleyson, Casey D., Martini, Matus N., and de Szoeke, Simon P. Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign. United States: N. p., 2015.
Web. doi:10.1002/2014MS000384.
Feng, Zhe, Hagos, Samson, Rowe, Angela K., Burleyson, Casey D., Martini, Matus N., & de Szoeke, Simon P. Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign. United States. https://doi.org/10.1002/2014MS000384
Feng, Zhe, Hagos, Samson, Rowe, Angela K., Burleyson, Casey D., Martini, Matus N., and de Szoeke, Simon P. Fri .
"Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign". United States. https://doi.org/10.1002/2014MS000384.
@article{osti_1295970,
title = {Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign},
author = {Feng, Zhe and Hagos, Samson and Rowe, Angela K. and Burleyson, Casey D. and Martini, Matus N. and de Szoeke, Simon P.},
abstractNote = {This paper investigates the mechanisms of convective cloud organization by precipitation-driven cold pools over the warm tropical Indian Ocean during the 2011 Atmospheric Radiation Measurement (ARM) Madden-Julian Oscillation (MJO) Investigation Experiment / Dynamics of the MJO (AMIE/DYNAMO) field campaign. A high-resolution regional model simulation is performed using the Weather Research and Forecasting model during the transition from suppressed to active phases of the November 2011 MJO. The simulated cold pool lifetimes, spatial extent and thermodynamic properties agree well with the radar and ship-borne observations from the field campaign. The thermodynamic and dynamic structures of the outflow boundaries of isolated and intersecting cold pools in the simulation and the associated secondary cloud populations are examined. Intersecting cold pools last more than twice as long, are twice as large, 41% more intense (measured by buoyancy), and 62% deeper than isolated cold pools. Consequently, intersecting cold pools trigger 73% more convective clouds than isolated ones. This is possibly due to stronger outflows that enhance secondary updraft velocities by up to 45%. However, cold pool-triggered convective clouds grow into deep convection not because of the stronger secondary updrafts at cloud base, but rather due to closer spacing (aggregation) between clouds and larger cloud clusters that formed along the cold pool boundaries when they intersect. The close spacing of large clouds moistens the local environment and reduces entrainment drying, allowing the clouds to further develop into deep convection. Implications to the design of future convective parameterization with cold pool-modulated entrainment rates are discussed.},
doi = {10.1002/2014MS000384},
journal = {Journal of Advances in Modeling Earth Systems},
number = 2,
volume = 7,
place = {United States},
year = {Fri Apr 03 00:00:00 EDT 2015},
month = {Fri Apr 03 00:00:00 EDT 2015}
}
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