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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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'fieldsMAGMA': A MAGMA-accelerated extension to the 'fields' spatial statistics R package
This report introduces the 'fieldsMAGMA' R package, an extension to the 'fields' package for spatial data analysis that is available on github. fieldsMAGMA uses the Cholesky decomposition functionality of the MAGMA multi-GPU, multi-CPU computing library and eliminates some unnecessary distance and covariance calculations to create accelerated versions of spatial statistics methods in fields. We demonstrate the performance of fieldsMAGMA's accelerated functions when applied to simulated datasets and the CO2 dataset available in fields. We show that using the single precision Cholesky decomposition in particular has the potential for vast improvements in the Cholesky decomposition and in spatial likelihood computation time, yet the accuracy of the likelihood maximization is not significantly reduced. We gather some of our timing results on a 2014 MacBook Pro with a stock graphics processing unit (GPU), an NVIDIA GeForce GT 750M with 2048 MB GDDR5 RAM.
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.
6600/7600 Primer
This report covers the basic principles of topics ordinarily included in a beginning programming class in FORTRAN for the Control Data 6600/7600 computers. The text refers specifically to the NCAR computer system and to procedures used by the NCAR Computing Facility. This text supplements the series of documents collectively referred to as the NCAR manuals and provides further clarification on topics that often present problems to a beginner.
A Barometric Survey of National Hail Research Experiment Mesonet Station Heights
The mesoscale meteorological surface network established for the support of the National Hail Research Experiment (NHRE) 1973 field experiment has been barometrically surveyed. The purpose of this technical note is to provide not only reasonably accurate absolute geometric heights, but also appropriate pressure (height) increments for each station referenced to several datum stations for the use of those who may work with NHRE mesonetwork data.
A Carrier Balloon for Tropical Soundings
During July 1970 to January 1971, a series of tests was conducted to demonstrate the feasibility of obtaining wind data in the tropical troposphere and lower stratosphere by location of a sonde dropped from a carrier balloon. In addition to the results of these tests, a full system design to be tested in 1974 is also described. This system will use the geostationary synchronous meteorological satellite (SMS) as the data link and can be implemented in conjunction with the GARP Data Acquisition Test.
A Catalogue of Mass Ejections Observed by the Solar Maximum Mission Coronagraph
The purpose of this publication is to provide a 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 between 1984 and 1989.
A Comparison of Quasi-geostrophic and Primitive Equation Models for Stratospheric Sudden Warming Simulations
This report explains questions and builds upon previous findings on the comparison of quasi-geostrophic and primitive equation models for stratospheric sudden warming simulations.
A Comparison of Shape Preserving Interpolators
This report provides a survey of a number of the currently accepted methods of shape preserving interpolation that have appeared in literature. In addition, the report presents a review of the methods, and then compares the schemes qualitatively and quantitatively, in order to provide a sound basis for choosing one for a particular application.
A Composite, High-Resolution Solar Spectrum From 2080 to 3600 A
To satisfy a need for digitized information on the solar spectrum between 2000 and 3600 A, an attempt was made to combine the available measurements into a composite, high-resolution solar spectrum in absolute units. The final values, though not absolutely accurate, should be adequate for many geophysical studies involving the near and middle ultraviolet portion of the solar spectrum.
A Description of Software for Determination of Normal Modes of the NCAR Community Climate Model
This report describes the development of NCAR's Community Climate Model (CCM) software to determine the eigensolutions of a linearized version of the CCM. These eigensolutions may be used for diagnostic analysis, nonlinear normal-mode initialization for numerical weather prediction experiments, or other purposes. Although the software has been designed for the CCM and its initialization, it should be easily modified for use with other models.

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