WPARICET

ICET Tide programs MT80 and WPARICET

1. General information on tidal programs readme.pdf

This is an overview of the programs ETERNA34 (in particular the forward tidal program PREDICT), MT80, and Tsoft.

2. MT80 to compute tidal series for gravity, tilt, or strain

Files can be found in the directory mt80-wparicet and subdirectories

The program description MT80TWdes.doc is reproduced here:

“MT80TW” program is a standard routine to compute tidal effects for gravity, tilt or strain. It requires for input a file with the geographical coordinates of the station and, as an option, tidal parameters (amplitude factors and phase differences) to be applied on the astronomical tides. For gravity tides, realistic tidal parameters can be obtained using the program WPARICET.  

Several options can be used for downloading. A DOS-executable MT80TW program is available with the associated files including an example. For users who did not install the Fortran compiler on their computers, the DOSXMSF.EXE is also available. For users of Fortran compiler, it is possible to download also the source files of the MT80TW program. All the required input files can be downloaded with the source programs.

 To have more information about MT80TW : please consult the README.HTM file and run the program for the period 2000/01/01 to 2001/01/01 using the test file named 0200MTHT.DAT which can be obtained by downloading MT80TW.EXE.

A sample input file is 0200mtht.dat in directory mt80w_exe

Summary: Use MT80 when you already have the gravimetric factors (d,k) or (delta, kappa), for a set of wave groups, for a station. These factors can either be nominal (i.e. derived from elastic Love numbers) such as d = 1.16, k = 0.0, or may have been obtained from previous tidal analysis, or interpolated from globally computed parameters (see PARICET). In the latter , more realistic case, ocean tide loading is included within the gravimetric factors.

3. WPARICET interpolates tidal gravimetric factors from globally computed maps

Files can be found in the directory mt80-wparicet and subdirectories

The program description WPARICET.doc is reproduced here

“WPARICET” program was initially created by Hans-Georg Wenzel in 1994. It extracts tidal parameters for individual stations from world wide 0.5°x0.5° synthetic gravity tide parameter maps. We propose here two different approaches:

- Zhou J.C. (2007) used the CSR3 ocean tides model together with a purely elastic Earth model. Ocean load vectors have been computed using the Agnew (1996, 1997) software.

- The NAO99 model was used at ICET with the Melchior et al. (1980) software. The computed load vectors were associated to a non hydrostatic/inelastic Earth model (Dehant et al., 1999) to compute modeled tidal parameters.

It requires for input a file named wparex.dat on which the station coordinates have to be stored before the execution of program WPARICET. You have to enter the code, the name, the latitude, the longitude and the height of the station into the file wparex.dat. The program WPARICET interpolates by bilinear interpolation the synthetic gravity tide parameters at the given stations. The output files (mt80.out, predict.out and tsoft.out) can be used directly as input file for the MT80TW, PREDICT or Tsoft tidal prediction programs.

When downloading Wparex.zip, you download also the source file of the WPARICET program as well as the test input file wparex.dat and the corresponding output files. For a detailed description refer to readme.pdf.

A sample input file is wparex.dat in directory wparicet_exe

Summary: Use WPARICET when you wish to obtain predefined gravimetric factors for a particular station. The output is converted to the appropriate format for the programs ETERNA34, MT80, and TSOFT described in readme.pdf. You can run any of these programs to get the time series for the synthetic tides at the station.