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Special project routine back trajectories: interim report

Berrisford, Paul (1996) Special project routine back trajectories: interim report. Project Report. British Atmospheric Data Centre (BADC). (Unpublished)

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The aim of the project is to provide a database of routine back trajectories. During the whole of 1995 252 5 day back trajectories were computed on a daily basis from a time of 12z. The arrival points were chosen to be on three regular latitude/longitude grids centred over the U.K., the mid-Atlantic storm track region and the eastern U.S.A. and were all located at 900hPa. The trajectories are computed for clusters of arrival points in order to estimate how sensitive the results are to small changes in the arrival position. This knowledge is useful for determining how accurate the results are likely to be. The computations were performed using the ECMWF trajectory package and the 6 hourly spectral T106 uninitialised operational analyses of the three components of the wind and ln(surface pressure). This data is interpolated to a 1.5x1.5 degree regular latitude/longitude grid. The package uses a simple mid-point type of algorithm with linear interpolations in both time and space and a timestep of 15 minutes. The output gzipped ASCII files contain information giving latitude, longitude and pressure at each timestep. The dataset is available both at the ECMWF (in ecfile directory /rgp/traj) and at the BADC at RAL.

Item Type: Monograph (Project Report)
Subjects: Chemistry
Atmospheric Sciences
Depositing User: Ms Belinda Robinson
Date Deposited: 26 Aug 2008 09:21
Last Modified: 17 Oct 2008 11:43
URI: http://cedadocs.ceda.ac.uk/id/eprint/50

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