Improved high resolution ocean reanalyses using a simple smoother algorithm

Dong, B., Haines, K. ORCID: https://orcid.org/0000-0003-2768-2374 and Martin, M. (2021) Improved high resolution ocean reanalyses using a simple smoother algorithm. Journal of Advances in Modeling Earth Systems, 13 (12). e2021MS002626. ISSN 1942-2466 doi: 10.1029/2021MS002626

Abstract/Summary

We present a simple smoother designed for smooth data adjustments in sequentially generated reanalysis products by utilizing knowledge of future assimilation increments. A decay time parameter is applied to the smoother increments to account for memory decay timescales in the ocean. The result is different from simply time smoothing the reanalysis itself as only the increments are smoothed so the reanalysis product can retain high frequency variability that is being internally generated by the model and the atmospheric forcing. The smoother is applied first to the Lorenz 1963 model and then to the daily Met Office GloSea5 Global ¼° ocean reanalysis during 2016. Results show significant improvement over the original reanalysis in the 3D temperature and salinity state and variability, as well as in the sea surface height (SSH). Comparisons are made directly against temperature, salinity and SSH observations, as well as independent 15m drifter velocities. The impact on the time variability of conservative quantities, particularly ocean heat and salt content, as well as Kinetic energy and the Atlantic overturning, is also demonstrated.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/100805
Identification Number/DOI	10.1029/2021MS002626
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > National Centre for Earth Observation (NCEO) Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	American Geophysical Union
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