AODTM-5: Arctic Ocean Tidal Forward Model

Laurence Padman, ESR

Map of M2 sea surface height amplitude (m) from AODTM-5.
Click on figure for clearer (*.png) version.
Phone: +1 (541) 753-6695
Fax: +1 (541) 753-1999

Lana Erofeeva, OSU
Phone: +1 (541) 737-3964
Fax: +1 (541) 737-2064

Susan Howard, ESR
Phone: +1 (206) 726-0501
Fax: +1 (541) 726-0524

 
Funded by NSF Polar Programs
 

Model and Software Summary

AODTM-5 (Padman and Erofeeva, 2004) is a high-resolution, 5-km regular grid regional forward tide model of the entire Arctic Ocean (see above figure). AODTM-5 is the numerical solution to the shallow water equations (SWE), which are essentially linear. Following Egbert and Erofeeva [2002], we solve the SWE by direct matrix factorization for 8 tidal constituents: M2, S2, N2, K2, K1, O1, P1, and Q1. Potentially significant simplifications to the SWE dynamics include our use of: tidal loading and self attraction computed from the TPXO6.2 global tidal inverse model; and the use of linear benthic friction to parameterize the dissipation term. We use a constant friction velocity value of 0.5 m s-1 for semi-diurnal constituents and 2 m s-1 for diurnals. The larger value for diurnal constituents is required because their currents are frequently strongest in relatively deep water along the shelf break. We assume that the errors introduced by the simplified dynamics can be corrected by the data assimilation. AODTM-5 is forced at the open ocean boundaries by elevations from TPXO6.2. Additional forcing is provided by the specified astronomical tide potentials.

AODTM-5 is distributed with a Matlab Graphical User Interface ("GUI") called "TMD" (the Tide Model Driver). TMD can be used to quickly access and browse the model, and to make tide height and current (velocity component) predictions. The TMD package also contains scripted functions for use in batch-mode Matlab processing. For an overview of the GUI and scripts, view or download the README PDF file. For FORTRAN access, please go to the Oregon State "OTIS" web page.

Please reference Padman and Erofeeva (2004) for the use of AODTM-5.

Contact Laurie Padman for advice on which model to use for a particular application, to be added to an update notification list, or for further information on the tide models.

Download Instructions

The Matlab-based version of AODTM-5, plus the TMD Toolbox, can be downloaded by clicking on the links below. The AODTM-5 file size is ~110 MB. If you prefer to receive the model by CD, please contact us. Arctic Ocean tide models will continue to be developed through the life of the Arctic Ocean Baroclinic Tides modeling program. We will also occasionally make updates to TMD.

Download model

Download TMD Matlab Toolbox

Download TMD Readme PDF

If you prefer, the model and TMD toolbox can be downloaded from our FTP site, as follows:

  1. ftp ftp.esr.org
  2. login: anonymous
  3. password: email address
  4. cd pub/datasets/tmd
  5. binary
  6. get aodtm5_tmd.zip (~110 MB)
  7. get tmd_toolbox.zip (~0.3 MB)

References

  1. Egbert, G.D., and S.Y. Erofeeva, 2002: Efficient inverse modeling of barotropic ocean tides, J. Atmos. Oceanic Technol., 19(2), 183-204.


  2. Padman, L. and S. Erofeeva, 2004: A barotropic inverse tidal model for the Arctic Ocean, Geophys. Res. Lett., 31(2), L02303, doi:10.1029/2003GL019003.