Changes between Version 18 and Version 19 of UM/MesoscaleModelling


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Timestamp:
16/07/19 09:37:54 (6 months ago)
Author:
willie
Comment:

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  • UM/MesoscaleModelling

    v18 v19  
    1616= Getting Initial Data = 
    1717 
    18 Start dumps for the UM, lateral boundary condition (LBC) files and ensemble data can be obtained from the Met Office archive system (MASS).  This is accessed using the MOOSE client - see [https://collab.metoffice.gov.uk/twiki/bin/viewfile/Static/MASS/monsoon_user_guide.html MOOSE User Guide].  This covers the latest five years. Start dumps from earlier periods can be constructed as GRIB files from ECMWF data. 
     18Start dumps for the UM, lateral boundary condition (LBC) files and ensemble data can be obtained from the Met Office Managed Archive Storage System (MASS).  This is accessed using the MOOSE client - see [https://collab.metoffice.gov.uk/twiki/bin/viewfile/Static/MASS/monsoon_user_guide.html MOOSE User Guide].  The data period ranges from 1 January 2006 to the current time. Start dumps from earlier periods can be constructed as GRIB files from ECMWF data. 
    1919 
    2020To get the data, create a help desk ticket providing the following information, 
     
    2727 
    2828== Getting data from the Met Office == 
    29 The start dumps are now stored in MASS, which can be accessed via MONSooN or JASMIN using the MOOSE interface. 
     29The start dumps are now stored in MASS, which can be accessed via MONSooN or JASMIN using the MOOSE interface. Instructions for setting up external access to MASS from JASMIN are available on the [http://collab.metoffice.gov.uk/twiki/bin/view/Support/ExMASSUserSetUpGuide Collaboration Twiki].  Access via Monsoon is discussed next. 
    3030 
    31 Instructions for setting up external access to MASS from JASMIN are available on the [http://collab.metoffice.gov.uk/twiki/bin/view/Support/ExMASSUserSetUpGuide Collaboration Twiki]. 
    32  
    33 The structure of the MASS repository has changed over the years due to changes in storage formats and file naming conventions. The script [attachment: get_dump], which should be run on Monsoon, does a good job of getting a start dump.  It takes a single argument which is a date: 
     31Login to Monsoon (xcs) and use the script [attachment: get_dump].  It takes a single argument which is the date of the required start dump, 
    3432 
    3533{{{ 
     
    3735}}} 
    3836 
    39 The script deals with dates from the earliest time 2006/01/01 0Z and is know to work up to 2019/06/26. 
     37The structure of the MASS repository has changed over the years due to changes in storage formats and file naming conventions. The script deals with dates from the earliest time 2006/01/01 0Z and is know to work up to 2019/06/26. 
    4038 
     39Not every date is available as the Met Office had a policy of thinning out the oldest part of the database.  In that case get a start dump prior to the time you want and run the UM forecast model to catch up. 
    4140 
    42 Generally, we prefer to get the output from the global runs - these have "qwqg" in the title; otherwise we get the global update - these have "qwqu" in the file name. 
    4341 
    4442For further information on using MOOSE on MONSooN and JASMIN see: [http://collab.metoffice.gov.uk/twiki/bin/view/Support/MooseOnMonsoon Getting started with MOOSE on MONSooN and JASMIN]. 
     
    4745=== UKV start dumps === 
    4846 
    49 The UKV start dumps use a non-regular, or variable, grid. The UKV start dumps are in MASS with path names like, 
     47The UKV start dumps use a non-regular, or variable, grid. The UKV start dumps are stored in MASS with path names like, 
    5048 
    5149 * `moose:/opfc/atm/ukv/rerun/201108.file/20110810_qwqv03.T+1` 
     
    5755=== UKV forecasts and analyses === 
    5856 
    59 The UKV forecasts and analyses are in the MASS with path names like, 
     57The UKV forecasts and analyses are stored in the MASS with path names like, 
    6058 
    6159`moose:/opfc/atm/ukv/prodm/YYYY.pp/prodm_op_ukv_YYYYMMDD_AA_NNN.pp` for the multilevel fields and 
     
    8482== Getting data from ECMWF == 
    8583The standard data provided is from ECMWF's operational data. It is a deterministic forecast from the atmospheric model, version 1, analysis. 
    86 Data prior to a certain date is in GRIB1 format, after that it is GRIB2.  The GRIB start dumps are created by concatenating the following fields: 
     84 
     85The GRIB start dumps are created by concatenating the following fields: 
    8786 
    8887 * skin temperature, 
     
    103102with spaces between the date components. 
    104103 
    105 In contrast, a typical UM dump contains fifty to 150 fields, so a GRIB start dump needs to be reconfigured by a UM model with a suitable scientific set up. 
     104If your UM model is currently using a Met Office start dump and you need to use a GRIB start dump, you will need to modify your UM model set up.  You will need to tell it you are using a GRIB file and also modify the reconfiguration to supply the fields that are missing in the GRIB start dump. 
    106105 
    107106