AOTIM5: Arctic Ocean Inverse Tide Model, on 5 kilometer grid, developed in 2004

• Main Authors: Padman, Laurie, Erofeeva, Svetlana, Howard, Susan
• Format: Dataset
• Language: English
• Published: NSF Arctic Data Center 2020
• Subjects: Tide Model; Arctic Ocean; currents; sea surface height; Arctic; Otis
• Online Access: https://dx.doi.org/10.18739/a2ws8hm3x; https://arcticdata.io/catalog/view/doi:10.18739/A2WS8HM3X

The 5 kilometer (km) Arctic Ocean Tidal Inverse Model developed in 2004 (AOTIM5) is a barotropic tide model on a polar stereographic grid. AOTIM5 was created using the OSU Tidal Inversion Software (OTIS) package (https://www.tpxo.net/). Model development is described by Padman and Erofeeva (2004) (https://doi.org/10.1029/2003GL019003). The bathymetry grid is based on the original International Bathymetric Chart of the Arctic Ocean (IBCAO) bathymetry (Jakobsson et al., 2000; https://doi.org/10.1029/00EO00059). AOTIM5 consists of grids of sea surface height and depth-integrated currents (“volume transports”) for each of 8 tidal constituents; 4 semidiurnal (M2, S2, K2, N2) and 4 diurnal (K1, O1, P1, Q1). The first step in building AOTIM5 was development of the Arctic Ocean Dynamics-based Tide Model (AODTM5), which is also available at the Arctic Data Center (https://arcticdata.io/catalog/view/doi:10.18739/A2901ZG3N). That model was forced at open ocean boundaries by the TOPEX/Poseidon global barotropic tidal solution version 6.2 (TPXO.6.2), and by local astronomical forcing (“potential tides”). Each constituent in AODTM5 was tuned, separately, to Arctic tide height data by optimizing the linear drag coefficient. AOTIM5 used AODTM5 as a “prior” model, then assimilated coastal and benthic tide gauges, and TOPEX/Poseidon and ERS satellite radar altimetry, to improve the 4 largest-amplitude constituents, M2, S2, K1 and O1. An updated version of this model created in 2018, Arc5km2018, is also available at the Arctic Data Center. The newer model uses updated open boundary conditions, and a wider range of assimilated data including much longer satellite altimetry records. We recommend that users compare results from AOTIM5 and Arc5km2018 before deciding which to use for a specific application. Please also check the ESR Polar Tide Model webpage (https://www.esr.org/research/polar-tide-models/) for more recent Arctic barotropic tide models. Padman, L., and S. Erofeeva (2004), A barotropic inverse tidal model for the Arctic Ocean, Geophysical Research Letters, 31(2), L02303, doi:10.1029/2003GL019003.