DOBSON: a Pentium-based SMP Linux PC Beowulf for distributed-memory high resolution environment modelling

Wang, K. Y.; Shallcross, D. E.; Hall, S. M.; Lo, Yi-Chuan; Chou, Charles C.‐K.; Chen, D.

doi:10.1016/j.envsoft.2004.09.003

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…In doing so, we intend to test if the large‐scale processes alone can reproduce the pronounced April 2001 dust storm as revealed from the satellite and the ground‐level measurements. Owing to the large quantities of particles needed to be closely followed throughout the simulation period, the DOBSON cluster was used in this work [ Wang et al , 2005b].…”

Section: Methodsmentioning

confidence: 99%

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Long‐range transport of the April 2001 dust clouds over the subtropical East Asia and the North Pacific and its impacts on ground‐level air pollution: A Lagrangian simulation

Wang

2007

J. Geophys. Res.

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One of the most remarkable Asian dust storms occurred in April 2001, during the periods of the Aerosol Characterization Experiment (ACE)‐Asia and the Transport and Chemical Evolution Over the Pacific (TRACE‐P) field experiments. Our high‐resolution Lagrangian simulations and the detailed comparisons with the Total Ozone Mapping Spectrometer (TOMS)‐Aerosol Index (AI) data, the Geostationary Meteorological Satellite (GMS)‐5 derived dust distribution, and the ground‐level ambient air particulate matter measurements over Taiwan in the subtropical East Asia reveal several features which were not reported before. We found that (1) the trans‐Pacific long‐range transport was dominated by the dust emissions from the natural source over the Gobi desert and the anthropogenic source over east China before 6–7 April, while the southward long‐range transport to the subtropical East Asia were mainly contributed by the dust emissions from natural source over the Taklamakan and the Gobi, and the anthropogenic source over east China after 6–7 April; (2) the southward long‐range transport implies that the anthropogenic pollution is ahead of the cold front (where the precipitation washes out the particulate matter), while the dust is behind the cold front. (3) The dust emissions from the Gobi during 7–9 April, anthropogenic emissions from east China during 9–10 April, and dust emissions from the Taklamakan during 1–4 April appear to have the most significant impacts on the ground‐level particulate matter concentrations over Taiwan. The simulated particle emitted from desert regions before 6–7 April mainly confined to the Gobi and the Taklamakan regions until 6 April when they became highly mobile for the long‐range transport by the large‐scale cyclonic activity and its associated cold air outbreak. The southward transport characteristics simulated here are consistent with the aerosol characterization observed at Taiwan during this period. Our simulations reveal that the rapid trans‐Pacific transport processes occurred on 12 April contribute to the extensive areas of elevated AI values prevail over the North Pacific during this day.

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Section: Methodsmentioning

confidence: 99%

“…Owing to the large quantities of particles needed to be closely followed throughout the simulation period, the DOBSON cluster was used in this work [Wang et al, 2005b].…”

Section: Experiments Methodsmentioning

confidence: 99%

Long‐range transport of the April 2001 dust clouds over the subtropical East Asia and the North Pacific and its impacts on ground‐level air pollution: A Lagrangian simulation

Wang

2007

J. Geophys. Res.

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“…Fortunately, with the ceaseless boost of personal computers and communication network, as well as the development of message passing interface (MPI) and corresponding realized software, Beowulf PC-cluster parallel system is a practicable solution to meet the need for high performance computations for those who have no access to using the supercomputer [1][2][3]. A Beowulf PC-cluster parallel system consists of a set of PCs with loose coupling and distributed memory, in which communications among PCs are based on network and message passing interface [4,5].…”

Section: Introductionmentioning

confidence: 99%

The Construction and Test for a Small Beowulf Parallel Computing System

Luo

Xie

Ruan

2010

2010 Third International Symposium on Intelligent Information Technology and Security Informatics

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As a practical scheme carrying out the high performance computing tasks for small research groups and personal researchers, we propose a small Beowulf PC-cluster parallel system based on MPI and Windows by employing a set of PCs and 100M Ethernet. The experimental evaluations on the classical case of computing π show that the system has satisfactory speedup and parallel efficiency. Owing to the 100M Ethernet which has less bandwidth and more communication delay, the speedup and parallel efficiency will come down with increasing working nodes, and a more excellent high speed network should be build.

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“…(Savarese and Sterling 1999;Baker and Buyya 1999;Wang et al 2005). Parallel MM5 model was developed with the same source approach by Argonne National Laboratory (ANL) using a Runtime System Library (RSL) and a Fortran Loop and Index Converter (FLIC) (Michalakes 1997).…”

Section: Implementation Of Parallel Mm5 On High Performance Clustersmentioning

confidence: 99%

Operational mesoscale atmospheric dispersion prediction using a parallel computing cluster

et al. 2006

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An operational atmospheric dispersion prediction system is implemented on a cluster supercomputer for Online Emergency Response at the Kalpakkam nuclear site. This numerical system constitutes a parallel version of a nested grid meso-scale meteorological model MM5 coupled to a random walk particle dispersion model FLEXPART. The system provides 48-hour forecast of the local weather and radioactive plume dispersion due to hypothetical airborne releases in a range of 100 km around the site. The parallel code was implemented on different cluster configurations like distributed and shared memory systems. A 16-node dual Xeon distributed memory gigabit ethernet cluster has been found sufficient for operational applications. The runtime of a triple nested domain MM5 is about 4 h for a 24 h forecast. The system had been operated continuously for a few months and results were ported on the IMSc home page.Initial and periodic boundary condition data for MM5 are provided by NCMRWF, New Delhi. An alternative source is found to be NCEP, USA. These two sources provide the input data to the operational models at different spatial and temporal resolutions using different assimilation methods. A comparative study on the results of forecast is presented using these two data sources for present operational use. Improvement is noticed in rainfall forecasts that used NCEP data, probably because of its high spatial and temporal resolution.

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DOBSON: a Pentium-based SMP Linux PC Beowulf for distributed-memory high resolution environment modelling

Cited by 6 publications

References 4 publications

Long‐range transport of the April 2001 dust clouds over the subtropical East Asia and the North Pacific and its impacts on ground‐level air pollution: A Lagrangian simulation

Long‐range transport of the April 2001 dust clouds over the subtropical East Asia and the North Pacific and its impacts on ground‐level air pollution: A Lagrangian simulation

The Construction and Test for a Small Beowulf Parallel Computing System

Operational mesoscale atmospheric dispersion prediction using a parallel computing cluster

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