Abstract's details

TPXO9v2 and TPXO9-atlas-v5: two new global barotropic tide models

Svetlana Erofeeva (Oregon State University, United States)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Tides, internal tides and high-frequency processes

Presentation type: Type Forum only

Two new versions of the TPXO and TPXO-atlas global barotropic tide models were released in October of 2021.

The TPXO9v2 model is an updated version of the previous TPXO9v1 model with 1/6-degree global resolution. The new TPXO9v2 now includes data-assimilative hydrodynamics-based models for the 2Q1, J1, L2, M3, MU2, NU2, OO1 tides, which were previously estimated using inference. While these may be considered minor tides, their sea surface elevations can individually exceed 5 cm in regional domains near the coast, making them important components of altimeter sea level corrections. In addition to using an expanded set of tides in TPXO9v2, this version also contains updated models for the P1 and S1 tides.

The TPXO9-atlas-v5 model is an updated version of the 1/30-degree tidal atlas, which smoothly blends together separate high-resolution coastal models with the TPXO9v2 model offshore. This latest version incorporates new regional solutions around Australia, the Iberian Peninsula and the polar areas, utilizing new data for bottom topography and coastlines. The TPXO9-atlas-v5 model does not yet contain the smaller constituents mentioned above, but continues to use 15 the constituents, M2, S2, N2, K2, 2N2, K1, O1, P1, Q1, Mf, Mm, M4, MN4, MS4, and S1. Among the quantitative differences between this latest TPXO9-atlas-v5 and previous versions, the model explains 3.7% more Cryosat-2 variance in the Arctic and 2.7% more in the Antarctic, compared to TPXO9-atlas-v2.
 
Svetlana Erofeeva
Oregon State University
United States
Svetlana.Erofeeva@oregonstate.edu