NCAR Technical Notes

The NCAR Technical Notes Collection comprises over 500 scientific and technical reports, issued by NCAR divisions and programs, and consists of data compilations, theoretical and numerical investigations, and experimental results.


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A Polarization Calibration Technique for the Advanced Stokes Polarimeter
A Polarization Calibration Technique for the Advanced Stokes Polarimeter
This document presents an efficient method for determination of the polarimeter response function of the Advanced Stokes Polarimeter (ASP). ASP has a linear polarizer which can be positioned in 450 increments, and a chromatic (approximately X/4) wave plate which can also be so positioned. The additional calibration configurations afforded by this combination allow determination of the retardance of the waveplate and the telescope output Stokes vector as part of the calibration procedure.
A Program Prospectus for a Cooperative High Plains Experiment on Convective Precipitation / Planned by the Bureau of Reclamation and the National Center for Atmospheric Research
A Program Prospectus for a Cooperative High Plains Experiment on Convective Precipitation / Planned by the Bureau of Reclamation and the National Center for Atmospheric Research
This program prospectus for a cooperative 1981 field season in Montana is the result of discussions between staff of the Bureau of Reclamation (HIPLEX) and NCAR (CSD), and of consultation with atmospheric scientists elsewhere. This represents only the initial step in thenecessary planning. The next steps in defining the program plan will be taken at a meeting attended by those scientists from universities and elsewhere who expect to take part in the cooperative experiment.
A Prototype Optical Flowmeter for the Measurement of Liquid Water Content
A Prototype Optical Flowmeter for the Measurement of Liquid Water Content
This report depicts the design and preliminary evaluation of an optical flowmeter for measurement of the liquid water content in warm clouds and rain showers. The sensing apparatus is a subminiature silicon photodiode which functions as a reflective scanner in measuring the water flow rate from a rotating bowl or centrifuge. The device is meant to be used on aircraft and requires relatively small power and simple laboratory calibration.
A Revised and Expanded Catalogue of Mass Ejections Observed by the Solar Maximum Mission Coronagraph
A Revised and Expanded Catalogue of Mass Ejections Observed by the Solar Maximum Mission Coronagraph
This is a revised and expanded catalogue of coronal mass ejections identified in data from the High Altitude Observatory's coronagraph aboard NASA's Solar Maximum Mission spacecraft. The list includes events observed during 1980 and the period 1984 through 1989. Additions include morphological descriptions of each event and apparent speed measurements, whenever possible.
A Selected Climatology of the Southern Hemisphere: Computer Methods and Data Availability
A Selected Climatology of the Southern Hemisphere: Computer Methods and Data Availability
In this write-up we discuss computer methods and announce the availability of a tape with magnetic grid point information for a more complete set of basic and derived data than that presented in the atlas. We also describe a set of microfilm having approximately 10,000 frames of basic charts, seasonal changes, cross sections, grid point values, etc. We finally announce the availability of a computer produced motion picture concerning the climatology of the Southern Hemisphere.
A Spectral Vegetation Radiometer for Airborne Boundary-layer Research
A Spectral Vegetation Radiometer for Airborne Boundary-layer Research
This document presents a comprehensive description of the Spectral Vegetation Radiometer (SVR) used on NCAR aircraft to derive information about the vegetation cover. Specifically provided is background information of the vegetation index, discussion of applications and descriptions of problems involved in analyzing the vegetation index. Furthermore, the reader obtains an inside view of the instrument design and how the calibration should be performed.
A Study of Synoptic and Mesoscale Interaction Over the GATE Ship Network: 4-5-6 September 1974
A Study of Synoptic and Mesoscale Interaction Over the GATE Ship Network: 4-5-6 September 1974
During the period 4-5-6 September 1974, several small-scale systems developed within the A-B ship array. One of these, on 5 September, was investigated by research aircraft on a Basic Cloud-Cluster Mission. This report presents the four-dimensional wind flow patterns given by synoptic streamline fields for 4-6 September 1974 and mesoscale patterns for 5 September. The patterns are related to the cloud and radar echo fields. This report is concerned exclusively with the wind field and its relation to the main cloud clusters indicated by satellite and radar. Every effort has been made to obtain available observations from the many sources operating during GATE and to integrate them in threedimensional space and time. It is intended both as a progress report and as a support document to facilitate the advanced researches of the authors. In brief, some of the aspects of scale interaction will be approached through budget studies of mass, moisture, and energy. The first part of this report, "Synoptic Analysis," prepared by Gordon Dean under NSF Grant ATM 76-14211, treats the synoptic-scale flow fields for the entire study period. The second part, "Mesoscale Analysis," prepared by Clark Smith, deals with the flow patterns centered on the 5 September mesoscale system when a multi-aircraft mission was flown in the B-C ship array.
A Survey of Difference Methods for Non-Steady Fluid Dynamics
A Survey of Difference Methods for Non-Steady Fluid Dynamics
Several finite-difference approximations to the hyperbolic equations of fluid dynamics are described, and their qualities assessed. They include the schemes normally used and, for comparison, an unstable and a completely stable implicit scheme. Accuracy and stability are discussed. The Lax-Wendroff scheme, for a system of conservation laws, is discussed for problems in one and in two space variables.
A Survey of Hawaii for Balloon Launch Sites
A Survey of Hawaii for Balloon Launch Sites
A group under Dr. Luis Alvarez at the Space Sciences Laboratory, University of California, is preparing a balloon-borne particle physics experiment, designed for recovery at sea. Winter flights in westerly winds require a launch site with water to the east, preferably near California. At the request of Dr. Alvarez' group, NCAR carried out a survey of potential launch sites in the Hawaiian Islands from 23 April through 5 May 1967. This report contains the details of this survey.
A Three-demiensional Variational (3DVAR) Data Assimilation System for Use With MM5
A Three-demiensional Variational (3DVAR) Data Assimilation System for Use With MM5
This report describes the three-dimensional variational (3DVAR) data assimilation system designed and built in the MMM Division of NCAR for use with the MM5 modeling system. This, and additional, documentation can be found online at the MM5 3DVAR web-site: http://www.mmm.ucar.edu/3dvar The 3DVAR system described here was also adopted in June 2001 as the starting point for 3DVAR development for the Weather Research Forecast (WRF) model. This version of the technical documentation focuses on the use of 3DVAR within the MM5 modeling environment.

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