2026-09-22T03:57:21Zhttps://api.mountainscholar.org/server/oai/request

oai:mountainscholar.org:10217/2443802026-05-08T11:05:34Zcom_10217_100532com_10217_100000com_10217_100333com_10217_100303col_10217_100538col_10217_100335

Cheng, Anning, author Randall, David A., advisor Johnson, Richard H., committee member Schubert, Wayne, committee member Strauss, Steven H., committee member 2026-05-07T18:07:44Z 2001 https://hdl.handle.net/10217/244380 https://doi.org/10.25675/3.026975 A parameterization of cumulus momentum transport is proposed. An important feature of the parameterization is the inclusion of the perturbation pressure-gradient force induced by interactions between the updraft and the environmental wind. The orientation, aspect ratio, phase speed and size of the organized convection are determined. These quantities depend on the vertical wind-shear and the stratification. GATE, ARM, EMEX, SCSMEX, and TOGA COARE data are used to test the theory. Results show that: 1) the predicted orientation, aspect ratio, and phase speed of organized convection agree well with the observations. 2) the vertical momentum transport is sensitive to the orientation of the cumulus clouds; 3) the momentum transport due to the perturbation pressure-gradient force tends to be upgradient and to cancel with the vertical momentum advection and detrainment effects. 4) the shear term produces positive convective kinetic energy (CKE), or negative CKE, depending on the vertical wind-shear and the velocity difference between the clouds and the environment; and 5) the CKE produced by shear accounts for about 1% of that by buoyancy, so its influence is very small in the cases studied here. doctoral dissertations English eng Colorado State University. Libraries 2000-2019 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. Per the terms of a contractual agreement, all use of this item is limited to the non-commercial use of Colorado State University and its authorized users. atmosphere environmental science A theory of the mesoscale organization of moist convection and the associated vertical momentum transport Text Doctor of Philosophy (Ph.D.) Doctoral Atmospheric Science Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access