1,163 Works

Library routines (*SY2)

Jeanne Adams & Paul Rotar

On the application of the eddy viscosity concept in the Inertial sub-range of turbulence

D Lilly
It is shown that an eddy diffusion hypothesis suggested by Smagorinsky for use in numerical solutions of turbulent flow problems is consistent with the existence of an inertial subrange at the smallest resolvable scale of the numerical model. The arbitrary constant, assumed by Smagorinsky to be of order unity, is shown to be a unique function of the constant of the Kolmogoroff energy spectrum function. An alternative hypothesis, involving an explicit turbulent intensity, is introduced...

The influence of compensating downward motion on the developmenty of cumulus clouds

Tomio Asai & Akira Kasahara
An attempt is made to assess the effects of the compensating downward motion associated with the updraft upon the development of a cumulus cloud. The model consists of two circular concentric air columns: the inside column (core) corresponds to the updraft region (cloud area) and the outside concentric annular column corresponds to the downward motion region (cloudless area). The combined cell is surrounded by the atmosphere at rest. The governing equations of both the updraft...

The numerical solution of partial differential equations

John Gary

The dynamical influence of topography on the large-scale motion of the atmosphere

Akira Kasahara
In an attempt to understand the dynamical influence of the earth's topography upon the large-scale motion of the atmosphere, the system of "shallow water" equations on the rotating earth is integrated numerically. The model consists of an incompressible, homogeneous, hydrostatic and inviscid fluid. The "beta-plane" approximation is used to simplify the model. The fluid is confined in a channel bounded by two parallel "walls" extended to the west and east directions. Periodic boundary conditions are...

The radiative cooling calculation for application to general circulation experiments

Takashi Sasamori
The Atmospheric Radiation Tables (ART) of Elsasser and Culbertson were used to calculate the atmospheric radiation, and the results are compared with those of other methods. The cooling rate calculated from ART agrees well with cooling rates calculated by more accurate methods; but the downward flux of water vapor bands computed from ART was found to be too small. This discrepancy may be attributed to the assumption of the temperature correction for the absorption coefficients...

NCAR global general circulation model of the atmosphere

Akira Kasahara & Warren Washington
This paper describes a model of the general circulation of the earth's atmosphere which has been developed and experimented with, since 1964, at the National Center for Atmospheric Research (NCAR), Boulder, Colorado. A distinguishing feature of the NCAR model is that the vertical coordinate is height rather than pressure, though hydrostatic equilibrium is maintained in the system. In fact, the dynamical framework of the model is very similar to the one proposed by L. F,...

Selected bibliography on wind waves and air-water interaction

R Drake, E Plate & G Hidy

Experiments on the generation of small water waves by wind

G Hidy, E Plate & P Change
The generation and growth of small water waves by a turbulent wind has been investigated in a laboratory channel. The evolution of these oscillations with fetch was traced from their inception with amplitudes in the micron range under conditions of steady air flow. The experiments revealed that the waves are generated at all air velocities in small bursts consisting of groups of waves of nearly constant frequency. After traveling for some distance downstream, these wavelets...

Comparison between wind waves at sea and in the laboratory

G Hess, G Hidy & E Plate
Correlations between laboratory and geophysical data are presented for certain statistical properties of wind waves. The parameters chosen include (a) Relations between mean wave height, and the height of the highest one-third or one-tenth waves, as given by a Rayleigh probability distribution, and (b) Amplitude spectra for waves, as given by Phillips' equilibrium theory. The correlation between laboratory results and geophysical data is very satisfactory over a wide range of wave size.

PROC02A: Enhancements to the PROC02 Version of the CCM Modular Processor

Richard Wolski
The report represents the significant number of revisions to the original "CCM Modular Processor User Guide", released in October, 1987. This report should be viewed as a supplement to the original "CCM Modular Processor Users' Guide (Version PROC02)". This supplement contains two indices: the first includes PROC02A entries only; the second is the result of merging the first index with the PROC02 Users' Guide index.

Omega Wind-error Estimation

Michael Olson, Ranjit Passi & Aubrey Schumann
This is a report on Omega wind error estimation. To make this a single source document on Omega windfinding and its errors, the authors have included derivation of basic equations for linear mean-square estimation and some relevant work on this subject. A discussion of strategies for the Global Weather Experiment (GWE) and the Monsoon Experiment (MONEX) is included with a broad assessment of the impact of bias errors on wind accuracy.

1980* Field Season Wkshp Report / Nov. 28, 29, & 30, 1978 High Country Inn, Winter Park, CO

This workshop produced the seven panel reports included here, which discuss various aspects of the work of CSD in considerable detail. Its main purpose is to gather sufficient data on both the microphysics and dynamics of convective clouds and storms to reveal how their interactions lead to the formation of precipitation, especially hail.

Meeting Review: Workshop on Airborne Instrumentation 19-21 October 1988

William Cooper & Darrel Baumgardner
Approximately 40-50 scientists met in October, 1988 to review needs for airborne instruments and to plan for development of some of the needed instrumentation. This report contains position papers, assessments of current instrumentation that came from the respective groups, and the consensus regarding needs for new instrumentation. A number of specific needs were identified where development projects are feasible, and where there was significant interest both on the part of the community at large and...

Field Observations of the Kinematics of Hailstones

Richard Matson & Arlen Huggins
This report studies the kinematic behavior of naturally falling hailstones using stroboscopic photography in a mobile van. The experiment is described and the results concerning hailstone shape and dimensions, velocity, and rotation rate are presented. The results of the experiment may have implications in hailfall instrumentation, doppler radar studies and hailstone growth models. They are most important to programs currently studying hailfall.

National Hail Research Experiment Data Catalog (1972-1976)

This document constitutes a portion of the final report to the National Science Foundation (NSF) on the National Hail Research Experiment (NHRE). The purpose of the material contained in this document is to summarize the research objectives, describe the observational systems and networks, present summaries of selected daily research activities showing how these correlate in time and space, discuss the quality and availability of observed data, and to summarize the instrument development programs sponsored by...

The White Light Solar Corona: An Atlas of 1988 K-coronameter Synoptic Charts Dec.1987 - Jan.1989

D Sime, C Garcia, E Yasukawa & E Lundin
The material presented in this report is in a format designed to provide convenient access to investigators intending to make correlative studies or an intercomparison of standard synoptic data sets, specifically, specification of the time-dependent structure of the solar corona. The data presented, observations made during 1988, show the continued evolution of the corona towards the anticipated maximum of the present cycle.

Eddyless Channel Flows and Their Stability

Stephen Jackson & James McWilliams
Numerical solutions are presented for steady flow in a zonal channel subjected to a meridionally varying zonal wind stress at the upper surface. The model used is adiabatic, hydrostatic, quasigeostrophic, and baroclinic with quadratic drag force at the lower boundary, vertical momentum diffusion in the interior, and a weak scale-selective horizontal momentum diffusion law. The solution technique is that of quasilinearization for the resulting non-linear, two-point boundary value problem. The steady solutions are also analyzed...

Scientific Research With High-altitude Balloons : A Brief Review of Recent Investigations

D Muller, D Kniffen, G Fazio, L Heidt, W Lewin, M Pelling & S White
The following report summarizes recent results of balloon-borne observations separately for the various disciplines: infrared astronomy, ultraviolet astronomy, X-ray astronomy, gamma-ray astronomy, cosmic rays, and atmospheric sciences. Bibliographies of the relevant publications are given for each discipline at the end of the corresponding section. Undoubtedly, the reader will find the great variety of significant research quite impressive. Nevertheless, we cannot hope to cover the field of scientific ballooning completely in this report. We may have...

The Energetics of Stochastic Continuum Equations for Fluid Systems

Rex Fleming
The purpose of this report is to introduce stochastic continuum equations for fluid systems that express this uncertainty dynamically. These equations, written in analytical form, describe continuous field quantities which dynamically predict the future and its believability. Their solution is achieved by closing the moment equations at some level and by closing the higher order derivatives at some order and are perfectly suited for the new emerging parallel computer architecture. The advantages of improved predictions,...

NCAR Software Catalog

Russell Rew, Dick Valent, Harsh Passi & Ginger Caldwell
An extensive collection of library software is available for use on the Scientific Computing Division (SCD) computers at NCAR, and is cataloged in this document. The NCAR Software Catalog is intended to assist users of the SCD computers in locating software appropriate to their problems, and to collect in one place all the information about library access, documentation, and support for each of the software libraries available at NCAR. This Catalog is not a substitute...

A Comparison of Quasi-geostrophic and Primitive Equation Models for Stratospheric Sudden Warming Simulations

Roger Daley & Grant Branstator
This report explains questions and builds upon previous findings on the comparison of quasi-geostrophic and primitive equation models for stratospheric sudden warming simulations.

Description of the NCAR Community Climate Model (CCM3)

J Kiehl, James Hack, Gordon Bonan, Byron Boville, Bruce Briegleb, David Williamson & Philip Rasch
This report presents the details of the governing equations, physical parameterizations, and numerical algorithms defining the version of the NCAR Community Climate Model designated CCM3. The material provides an overview of the major model components, and the way in which they interact as the numerical integration proceeds. Details on the coding implementation, along with in-depth information on running the CCM3 code, are given in a separate technical report entitled "User's Guide to NCAR CCM3" (Acker...

Mesoscale Adjoint Modeling System: Version 1

Ronald Errico, Kevin Raeder & Tomislava Vukicevic
This technical note serves several purposes. In Part I, the development of adjoints is described in general terms for spatially and temporally discrete models. In Part II, the nonlinear, tangent linear, and adjoint equations are described. The software is described in Part III. A user's guide containing essential instructions for running and interpreting the software appears in Part IV. Some of the execution characteristics of the software and its testing methodologies are described in Part...

An Overview of the Scientific Computing Division

This document is an expanded revision of An Overview of NCAR's Computing Environment (NCAR/TN-177+IA). It contains a new chapter describing the various departments within SCD and the major components of the SCD computing systems, as well as three appendices containing technical information for the interested reader. The other chapters have been updated to include the latest information on subjects of interest to visitors and users of SCD's computing equipment.

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