What's New in Baseline-B for Polar Oceans

Cryo-TEMPO Baseline-B products for Polar Oceans were released in January 2023. See the product downloads page for access details.

The following evolutions have been applied in Baseline-B as compared to Baseline-A (released Jan 2022). Further details are provided in the Cryo-TEMPO Product Handbook and ATBD documents.

LRM Data

LRM mode data is now merged from the CryoSat L2 GOPM product. In baseline-A there was no data over the areas covered by the LRM mode mask.

Retracker

A new SAMOSA+ physical retracker is used in baseline-B which replaces the empirical TFMRA retracker used in baseline-A. A reference for the SAMOSA+ retracker is provide by Laforge.A, Fleury.S, Dinardo.S, Garnier.F, Remy.F, Benveniste.J, Bouffard.J, Verley.J, Toward improved sea ice freeboard observation with SAR altimetry using the physical retracker SAMOSA+, Advances in Space Research, Volume 68, Issue 2, 2021, Pages 732-745, ISSN 0273-1177, https://doi.org/10.1016/j.asr.2020.02.001

Additional Parameters

A new region_code parameter has been included. This provided the Arctic region indentifier (0..18) for every measurement. The regions are adapted from 'A new regional mask for Arctic sea ice trends and climatologies (J. Scott Stewart and Walter N. Meier, NSIDC)'

Tide Corrections

Tide correction now uses the ARCTIDE (v1.1) tidal model where available. FES2014b is used where ARCTIDE is not available (outside it's Arctic grid area).

Further information on ARCTIDE is provided by the reference: M. Cancet, O. B. Andersen, F. Lyard, D. Cotton, and J. Benveniste, Arctide2017, a high-resolution regional tidal model in the Arctic Ocean, Advances in Space Research, vol. 62, no. 6, pp. 1324–1343, 2018, doi: 10.1016/j.asr.2018.01.007).

Atmospheric Corrections

DAC (Dynamic Atmosphere Correction) now used instead of IB (Inverted Barometer). The DAC includes the IB correction as well as a high frequency MOG2D barometric model forced by wind and pressure.

Mean Sea Surface

Mean Sea Surface (MSS) has been updated from the DTU15 to DTU21. The reference for DTU21 is Andersen, Ole Baltazar (2022): DTU21 Mean Sea Surface. Technical University of Denmark. Dataset. https://doi.org/10.11583/DTU.19383221.v1 )