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in subjects: "Simulation 580000* -- Geosciences"

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Parameterization of convective clouds, mesoscale convective systems, and convective-generated cirrus

A level 2.5w deep convection updraft/downdraft parameterization scheme has been refined and tested against 3D simulations of sea-breeze generated convection over S. Florida. Cases for explicit simulation of MCSs in mid-latitudes and tropics have been encouraging. After a few refinements in those cases, fine resolution explicit simualtions of deep convection and mesoscale, stratiform clouds will be begun.

Date: March 3, 1992

Creator: Cotton, W.R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of an advanced finite-difference atmospheric general circulation model

We have proposed to provide and further develop an advanced finite-difference climate model for use in CHAMMP. The model includes advanced parameterizations of cumulus convection, boundary-layer processes, cloud formation, and land-surface vegetation, as well as parameterizations of radiative transfer and gravity wave drag. Postprocessing codes and a user's guide will also be provided. This research is being conducted in collaboration with Professors C.R. Mechoso and A. Arakawa at the Universit… more

Date: March 1992

Creator: Randall, D.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A cumulus parameterization scheme designed for nested grid meso-. beta. scale models

A generalized cumulus parameterization based upon higher order turbulence closure has been incorporated into one dimensional simulations. The scheme consists of a level 2.5w turbulence closure scheme mated with a convective adjustment scheme. The convective adjustment scheme includes a gradient term which can be interpreted as either a subsidence term when the scheme is used in large scale models or a mesoscale compensation term when the scheme is used in mesoscale models. The scheme also inclu… more

Date: October 1991

Creator: Weissbluth, M.J. & Cotton, W.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

An approach for parameterizing mesoscale precipitating systems

A cumulus parameterization laboratory has been described which uses a reference numerical model to fabricate, calibrate and verify a cumulus parameterization scheme suitable for use in mesoscale models. Key features of this scheme include resolution independence and the ability to provide hydrometeor source functions to the host model. Thus far, only convective scale drafts have been parameterized, limiting the use of the scheme to those models which can resolve the mesoscale circulations. As i… more

Date: 1991~

Creator: Weissbluth, M. J. & Cotton, W. R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Regional-scale simulations of the western United States climate

Mesoscale models can provide a sufficiently detailed regional climatology. From these pioneering studies, we were inspired to begin to develop regional climatologies with the Colorado State University Regional Atmospheric Modeling System (CSU-RAMS). Our major goal is to develop a better understanding of the hydrologic cycle in the mountainous, arid west. An advantage of using the RAMS code is that we can generate detailed descriptions of precipitation processes, which will hopefully translate i… more

Date: September 1, 1991

Creator: Bossert, J.E.; Kao, C.-Y.J. (Los Alamos National Lab., NM (United States)); Roads, J.O.; Chen, Shyh-C. & Ueyoshi, Kyozo (Scripps Institution of Oceanography, La Jolla, CA (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Massively parallel implementation of the Penn State/NCAR Mesoscale Model

Parallel computing promises significant improvements in both the raw speed and cost performance of mesoscale atmospheric models. On distributed-memory massively parallel computers available today, the performance of a mesoscale model will exceed that of conventional supercomputers; on the teraflops machines expected within the next five years, performance will increase by several orders of magnitude. As a result, scientists will be able to consider larger problems, more complex model processes,… more

Date: January 1, 1992

Creator: Foster, I. & Michalakes, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Modeling earthquake ground motion with an earthquake simulation program (EMPSYN) that utilizes empirical Green's functions

This report outlines a method of using empirical Green's functions in an earthquake simulation program EMPSYN that provides realistic seismograms from potential earthquakes. The theory for using empirical Green's functions is developed, implementation of the theory in EMPSYN is outlined, and an example is presented where EMPSYN is used to synthesize observed records from the 1971 San Fernando earthquake. To provide useful synthetic ground motion data from potential earthquakes, synthetic seismo… more

Date: January 1, 1992

Creator: Hutchings, L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Numerical models of 2-D and 3-D geophysical convection

A suite of computational models has been developed which simulate thermal/chemical convection over a wide range of Rayleigh numbers both in 2-D annular and 3-D Cartesian geometries, for small Reynolds number flow, and a variety of boundary conditions. These simulators are revealing the patterns of convection that may occur in the earth, from mantle scale down to more localized regions such as mid-ocean spreading centers, on down to the scale of magma chambers. Features such as surface plates, v… more

Date: January 1, 1990

Creator: Travis, B.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

KDYNA user's manual

This report is a complete user's manual for KDYNA, the Earth Sciences version of DYNA2D. Because most features of DYNA2D have been retained in KDYNA much of this manual is identical to the DYNA2D user's manual.

Date: September 28, 1990

Creator: Levatin, J. A. L.; Attia, A. V. & Hallquist, J. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department