Commit 62a12e6b8edd3cf0a2cc526776378c09e140015e

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Ajout d'un fichier HOWTO expliquant comment formater les données en intrant, pré…

…paré par Elisabeth Schulz (Leibniz-Institute for Baltic Sea Research Warnemuende, Germany)
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GOTM_HOWTO_observations.txt 0 → 100644
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  1 +GOTM simulations can be forced by observational data, that is actually measured or artificially computed data. The options are described in the associated namelist file, obs.nml, as well as in section 6, Working with observed data in GOTM, of the documentation [GOTM scientific documentation, http://www.gotm.net/index.php?go=documentation].
  2 +
  3 +For most observational forcings, three _methods are implemented:
  4 +0: zero
  5 +1: constant, analytical or tidal
  6 +2: from file
  7 +
  8 +This HOWTO describes the format of the input files which need to be provided if _method = 2. Besides the data itself, the ASCII files have to contain the time stamps and, for profile data, the associated depth information.
  9 +
  10 +The time format is yyyy-mm-dd hh:dd:mm, i.e. with date and clock time separated by a space and the three date components as well as the three clock time components separated by single characters. The time stamps do not need to be equidistant, i.e. the time step, dt, of the observational data is allowed to vary.
  11 +
  12 +Files for non-profile data (0d) comprise a table of two or more space- or tab-separated columns. The first column contains the time stamps and the following columns contain the data.
  13 +Example:
  14 +1999-07-05 01:38:24 1.6411
  15 +1999-07-05 01:42:44 1.7143
  16 +1999-07-05 01:47:03 1.7847
  17 +<snip>
  18 +[GOTM devel test case liverpool_bay/zeta.dat]
  19 +
  20 +Files for profile data (1d) comprise time-based data sets, each of which consists of a single line, containing the time stamp and depth metadata, followed by a table of two- or more space- or tab-separated columns. The depth metadata consists of the number of entries in the vertical and an integer representing the direction of the entries, i.e. 1 for upward (from bottom to surface) and any other integer, commonly 2, for downward entries. It is allowed to vary from data set to data set, i.e. over time. The first colum of the table contains the depth (negative, zero at top) and the following columns contain the data. The depth does not need to be equidistant.
  21 +Example:
  22 +1976/04/06 00:00:00 50 1
  23 + -143.55 35.104939
  24 + -140.65 35.104012
  25 + -137.75 35.103081
  26 +<snip 45 lines>
  27 + -4.35 35.060390
  28 + -1.45 35.059460
  29 +1976/04/07 00:00:00 50 1
  30 + -143.55 35.104939
  31 +<snip>
  32 +[GOTM devel test case flex/sprof.dat]
  33 +
  34 +The following list summarises the type of data (0d: non-profile, 1d: profile), the number of data columns (exclusive of time for 0d or depth for 1d) and the respective variable(s) for each input file:
  35 +
  36 +s_prof_file
  37 + 1d; 1; salinity
  38 +t_prof_file
  39 + 1d; 1; temperature
  40 +ext_press_file
  41 + 0d; 3; ???
  42 + data interpreted as ext_press_mode:
  43 + 0: surface elevation gradient
  44 + 1: current meter measurement at a given height
  45 + 2: vertically averaged current speed
  46 +int_press_file
  47 + 1d; 4; dsdx, dsdy, dtdx, dtdy (horizontal salinity and temperature gradients)
  48 +extinct_file
  49 + 0d; 3; ??? (extinction coefficient?)
  50 + note: only if _method = 0
  51 +w_adv_file
  52 + 0d; 2; w_height, w_adv (depth, vertical advection velocity)
  53 +zeta_file
  54 + 0d; 1; sea surface elevation
  55 +wave_file
  56 + 0d; ?; ??? (wind waves' significant wave height, mean zero-crossing period, mean direction?)
  57 +vel_prof_file
  58 + 1d; 2; u, v (horizontal velocities)
  59 +e_prof_file
  60 + 1d; 1; dissipation rate
  61 +o2_prof_file
  62 + 1d; 1; oxygen
  63 + data in o2_units:
  64 + 0: saturation (%)
  65 + 1: mmol/m3
  66 + 2: ml/m3
  67 +bio_prof_file
  68 + 1d; 4; ???? (biogeochemical profile, NPZD?)
  69 +
  70 +
  71 +version 2011-06-17 by Elisabeth Schulz (IOW)
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