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MARS archiving

This document summarizes key discussions and decisions from the ELDAS Interim Data Coordination Meeting held on September 17-18, 2003. It includes new classifications for ELDAS data, emphasizes the handling of diverse experiment versions, and provides protocols for data storage and retrieval. Key points cover the handling of precipitation data, derived from various sources including gauge and radar, and outline the requirements for gridded observations. Furthermore, it discusses meteorological background fields and introduces production output fields from external centers adapted to ELDAS orography.

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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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