2,630 Works

Asynchronous Communication in Spectral Element and Discontinuous Galerkin Methods for Atmospheric Dynamics

Benjamin Jamroz & Robert Klöfkorn
The scalability of computational applications on current and next generation supercomputers is increasingly limited by the cost of inter-process communication. We implement non-blocking asynchronous communication in the High-Order Methods Modeling Environment for the time-integration of the hydrostatic fluid equations using both the Spectral Element and Discontinuous Galerkin methods. This allows the overlap of computation with communication effectively hiding some of the costs of communication. A novel detail about our approach is that it provides some...

NCEP Climate Forecast System Reanalysis (CFSR) Selected Hourly Time-Series Products, January 1979 to December 2010

Suranjana Saha, Shrinivas Moorthi, Hua-Lu Pan, Xingren Wu, Jie Wang, Sudhir Nadiga, Patrick Tripp, Robert Kistler, John Woollen, David Behringer, Haixia Liu, Diane Stokes, Robert Grumbine, George Gayno, Jun Wang, Yu-Tai Hou, Hui-Ya Chuang, Hann-Ming H. Juang, Joe Sela, Mark Iredell, Russ Treadon, Daryl Kleist, Paul Van Delst, Dennis Keyser, John Derber … & Mitch Goldberg
The National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) was initially completed over the 31-year period from 1979 to 2009 and has been extended to March 2011. NCEP has created selected time series products at hourly temporal resolution by combining either 1) the analysis and one- through five-hour forecasts, or 2) the one- through six-hour forecasts, for each initialization time. Please note that NCEP only created time series for parameter/level combinations that...

NCEP Climate Forecast System Reanalysis (CFSR) 6-hourly Products, January 1979 to December 2010

Suranjana Saha, Shrinivas Moorthi, Hua-Lu Pan, Xingren Wu, Jie Wang, Sudhir Nadiga, Patrick Tripp, Robert Kistler, John Woollen, David Behringer, Haixia Liu, Diane Stokes, Robert Grumbine, George Gayno, Jun Wang, Yu-Tai Hou, Hui-Ya Chuang, Hann-Ming H. Juang, Joe Sela, Mark Iredell, Russ Treadon, Daryl Kleist, Paul Van Delst, Dennis Keyser, John Derber … & Mitch Goldberg
The National Centers for Environmental Prediction (NCEP) Climate Forecast System Reanalysis (CFSR) was initially completed over the 31-year period from 1979 to 2009 and has been extended to March 2011. CFSR was initialized 4 times per day (0000, 0600, 1200, and 1800 UTC), and the 6-hourly atmospheric, oceanic and land surface analyzed products are available at 0.3, 0.5, 1.0, 1.9, and 2.5 degree horizontal resolutions, along with forecast hours 1 through 6. However, not all...

Community Demographic Model International Migration (CDM-IM) Dataset : Generating Age and Gender Profiles of International Migration Flows

Raphael J Nawrotzki & Leiwen Jiang
The demographic features of a growing number of international migrants increasingly impacts socioeconomic development in various countries of the world. However, information on international migrant’s demographic characteristics is sparse. To develop the multiregional population/urbanization projections module of the NCAR Community Demographic Model (CDM) requires information on the age and gender composition of international migration streams. This paper reports on the methods used to generate the CDM International Migration dataset, which contains information on the age...

ERA-40 Global Upper Air Radiosonde Observation Feedback Record Reports

ERA-40 Global Upper Air Radiosonde Observation Feedback Record Reports include 6 hourly upper air radiosonde observation (RAOB) feedback record reports from RAOBs used in the ECMWF 45-year reanalysis (ERA-40) covering the period from September 1957 to August 2002. RAOBs, from multiple data sources, were assimilated into an ECMWF model and produced ERA-40. Select variables found in the reports include temperature, pressure, height, relative humidity, specific humidity, zonal wind, and meridional wind speed components. Data may...

International Comprehensive Ocean-Atmosphere Data Set (ICOADS) Release 2.5, Monthly Summaries

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This dataset is superseded by ICOADS Release 3, Monthly Summary [https://rda.ucar.edu/datasets/ds548.1] The International Comprehensive Ocean-Atmosphere Data Set (ICOADS) is a global ocean marine meteorological and surface ocean dataset. It is formed by merging many national and international data sources that contain measurements and visual observations from ships (merchant, navy, research), moored and drifting buoys, coastal stations, and other marine platforms. The coverage is global and sampling density varies depending on date and geographic position relative...

North American Regional Climate Change Assessment Program dataset

Linda Mearns, Seth McGinnis, Raymond Arritt, Sebastien Biner, Phillip Duffy, William Gutowski, Isaac Held, Richard Jones, Ruby Leung, Ana Nunes, Mark Snyder, Daniel Caya, James Correia, David Flory, Daryl Herzmann, Rene Laprise, Wilfran Moufouma-Okia, Gene Takle, Haiyan Teng, Josh Thompson, Simon Tucker, Bruce Wyman, Anila Anitha, Lawrence Buja, Christopher Macintosh … & Casey Zoellick
The North American Regional Climate Change Assessment Program (NARCCAP) dataset contains simulation output from six regional climate models: CRCM, ECPC-RSM, HadRM3, MM5, RegCM3, and WRF. More than forty 2-D and 3-D output variables are stored to support impacts analysis, model evaluation, and further dynamical downscaling. All models are run at 50-km spatial resolution, with data stored at 3-hourly intervals. The simulation domain covers most of North America, including the conterminous United States, most of Canada,...

Generalized additive modelling of daily precipitation extremes and their climatic drivers

Mari Jones, Stephen Blenkinsop, Hayler Fowler, David Stephenson & Christopher Kilsby
Detection of changes in climate responses is essential to facilitate appropriate adaptation actions to be taken by decision makers, particularly where changes in the arrival rate and intensity of extreme daily precipitation event may lead to high impact flooding. Long established hydrological practice may no longer be appropriate if these changes are significant over the engineering design life. While extreme daily precipitation events are known to be seasonally over-dispersed, the dependent relationship between events is...

CORE.2 Global Air-Sea Flux Dataset

Stephen G. Yeager & William G. Large
This dataset contains the complete set of global air-sea heat and water flux components computed from version 2 of CORE (Common Ocean Reference Experiment) atmospheric state fields starting from 1949. The air-sea fluxes are derived from bulk formulae applied to atmospheric state fields from multiple sources together with a merged Hadley-OI SST product at monthly resolution. The primary atmospheric input data are based on NCEP reanalyses at 6-hourly resolution. In addition, satellite-based radiation, precipitation, and...

Meeting Review: Airborne Aerosol Inlet Workshop 27-28 February and 1 March 1991

Darrel Baumgardner, Barry Huebert & Chuck Wilson
The report, published as a result of the Airborne Aerosol Inlet Workshop, acts as a document that will alert the scientific community to the possible problems in interpreting data taken with airborne inlets and will inspire others to develop new technologies that will minimize these problems.

The Delta-Eddington Approximation for a Vertically Inhomogeneous Atmosphere

Warren Wiscombe
The delta-Eddington approximation of Joseph, Wiscombe, and Weinman (1976) is extended to an atmosphere divided up by internal levels into homogeneous layers. Flux continuity is enforced at each level, leading, as the mathematical essence of the problem, to a penta-diagonal system of linear equations for certain unknown constants. Fluxes (up, direct down, diffuse down, and net) are then predicted at each level. Unphysical results of the model are examined in detail. Potential numerical instabilities in...

International Workshop on the Airborne Measurement of Wind, Turbulence, and Position 26-28 July 1989 Oberpfaffenhofen

Hans Fimpel, Darrel Baumgardner & Anne Jochum
This report summarizes the sessions of the International Workshop on the Airboune Measurement of Wind, Turbulence and Position. It includes oral presentations as well as working sessions which provide conclusions and recommendations.

The White Light Solar Corona an Atlas of K-coronameter Synoptic Charts December 1981 - January 1983

K Rock, R Fisher, C Garcia, P Seagraves & E Yasukawa
This report contains data obtained during the synoptic observing project of the High Altitude Observatory's Coronal Dynamics Program that began on 5 August 1980 from the Mark-II1 K-coronameter located at the Mauna Loa Solar Observatory, Hawaii. This data which is published yearly in volumes of The White Light Solar Corona; An Atlas Of K Coronameter Synoptic Charts (Table 1). The reader will notice a segment of overlapped data at both the beginning and the end...

Taiwan Area Mesoscale Experiment: A Guide to Precipitation Patterns During the 1987 Field Phase

Stanley Trier
This document summarizes radar reflectivity patterns in the Doppler radar coverage area during the field phase of the experiment. Its purpose is (1)to provide a condensed sample data set for scientists to aid in the selection of Doppler radar data to be used for scientific analysis, and (2) to provide investigators who are not necessarily interested in using Doppler radar data with a general summary of precipitation patterns during the experiment.

A Catalogue of Mass Ejections Observed by the Solar Maximum Mission Coronagraph

O St. Cyr & J Burkepile
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.

The White Light Solar Corona an Atlas of 1984 K-coronameter Synoptic Charts December 1983-January 1985

R Fisher, C Garcia, E Lundin, P Seagraves, D Sime & K Rock

An Overview of the Scientific Computing Division

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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.

National Hail Research Experiment Data Catalog (1972-1976)

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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.

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.

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