Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign Public Deposited

http://ir.library.oregonstate.edu/concern/articles/5m60qt66q

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by John Wiley & Sons, Ltd. on behalf of American Geophysical Union. The published article can be found at:  http://sites.agu.org/

The DYNAMO field campaign data used in this paper is available at NCAR's Earth Observing Laboratory's DYNAMO Data Catalogue  https://www.eol.ucar.edu/field_projects/dynamo. The data set names are: R/V Roger Revelle Flux, Near-Surface Meteorology, and Navigation Data and S-PolKa Radar, fully corrected, merged, final moments data in cfRadial format.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • 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 with buoyancy), and 62% deeper than isolated cold pools. Consequently, intersecting cold pools trigger 73% more convection than do isolated ones. This is 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 form along the cold pool boundaries when they intersect. The close spacing of large clouds moistens the local environment and reduces entrainment drying, increasing the probability that the clouds further develop into deep convection. Implications for the design of future convective parameterization with cold pool-modulated entrainment rates are discussed.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Feng, Z., Hagos, S., Rowe, A. K., Burleyson, C. D., Martini, M. N., & de Szoeke, S. P. (2015). Mechanisms of convective cloud organization by cold pools over tropical warm ocean during the AMIE/DYNAMO field campaign. Journal of Advances in Modeling Earth Systems, 7(2), 357-381. doi:10.1002/2014MS000384
Series
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-10-06T15:06:04Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) deSzoekeSimonCEOASMechanismsConvectiveCloud.pdf: 2777906 bytes, checksum: e787b4d1da48c5a4484117facd68ce2e (MD5)
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-10-06T15:05:30Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) deSzoekeSimonCEOASMechanismsConvectiveCloud.pdf: 2777906 bytes, checksum: e787b4d1da48c5a4484117facd68ce2e (MD5)
  • description.provenance : Made available in DSpace on 2015-10-06T15:06:04Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) deSzoekeSimonCEOASMechanismsConvectiveCloud.pdf: 2777906 bytes, checksum: e787b4d1da48c5a4484117facd68ce2e (MD5) Previous issue date: 2015-06

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items