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MARS archiving

MARS archiving. Pedro Viterbo and Gisela Seuffert European Centre for Medium Range Weather Forecasts. ELDAS Interim Data Co-ordination Meeting 17./18.09.2003. GRIB for MARS archive. General remarks: New Class for ELDAS: Number 8 , Mars mnemonic ‘el’

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MARS archiving

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  1. MARS archiving Pedro Viterbo and Gisela Seuffert European Centre for Medium Range Weather Forecasts ELDAS Interim Data Co-ordination Meeting 17./18.09.2003

  2. GRIB for MARS archive • General remarks: • New Class for ELDAS: Number 8, Mars mnemonic ‘el’ • Different experiment versions identified by EXPVER  final version (EXPVER=1) • Different productions of the same variable (e.g. soil moisture, precipitation) identified by ‘’STREAM’’ • Forcing fields produced outside ECMWF: • TYPE=34 (‘’gridded observations’’) • Data should be saved from N S and W E • Parameter numbers: table 128 • Grid 0.2 x 0.2 (or multiplies of it), ELDAS orography • Data producer should: • provide sample routines to read the data • provide data grib coded (bunches of monthly data, minimum) via ftp  fine tuning of grib code can be performed before putting the data into MARS

  3. Precipitation in Mars • Streams (parameter number= 228): • Daily fields (06UTC- 06UTC) derived from gauge data • Daily fields (06UTC- 06UTC) derived from gauge + radar data • Daily precipitation errors ( filled with 24h forecasts) (TYPE=13) • 3-hourly disaggregated fields (based on forecast) • SW+LW radiation: • Bit-mapped • Parameter number: SW:169, LW:175 • 3-hourly

  4. Other forcing fields • Heating rates: • Strange fields for MARS: • Suggestion to store 4 fields: • T • flag • Initial time UTC (HHMM) • Final time UTC (HHMM) • Meteorological background field from ECMWF: • 2T, 2Q/RH, 10U/V, advection , … • 2m-T interpolated and adjusted via lapse-rate to ELDAS orography • 2m-RH no adjustment • Based on 6-hourly t511/60 level data: • 1 Oct 1999 00 UTC – 7 Aug 2000 18 UTC: 12-36 hour forecast starting from ERA40 159/60 level initial conditions • Spherical harmonics data projected to reduced gaussian grid and then interpolated to 0.2 deg • Based on ECMWF orography

  5. Production output fields • Production output fields from outside ECMWF: • Data source identifier: originating centre • Sub-centre identifier: 98 (ECMWF) • ECMWF output adapted to ELDAS orography • 0.2 x 0.2 grid

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