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Operational mesoscale atmospheric dispersion prediction using a parallel computing cluster

Srinivas, CV and Venkatesan, R and Muralidharan, NV and Das, S and Dass, H and Kumar, PE (2006) Operational mesoscale atmospheric dispersion prediction using a parallel computing cluster. Journal of Earth System Science, 115 (3). pp. 315-332.

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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 4h for a 24h 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.

Item Type: Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Uncontrolled Keywords: airborne survey; atmospheric plume; fallout; mesoscale meteorology; numerical model; parallel computing; weather forecasting, Asia; Delhi; Eurasia; India; Kalpakkam; New Delhi; North America; South Asia; Tamil Nadu; United States
Subjects: Meteorology and Climatology
Depositing User: Administrator ePrints@MoES
Date Deposited: 17 Aug 2015 10:58
Last Modified: 17 Aug 2015 10:58

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