Comparison Analysis of Heat and Mass Transport through Fram Strait Calculated Using the Mooring and Ocean Reanalysis Data

A. V. Smirnov1, ✉, V. V. Ivanov1, 2, A. A. Sokolov1

1 Arctic and Antarctic Research Institute, Saint Petersburg, Russian Federation

2 M. V. Lomonosov Moscow State University, Moscow, Russian Federation

✉ e-mail: avsmir@aari.ru

Abstract

Purpose. This paper presents a comparison analysis of water, heat and salt transports through Fram Strait calculated by using mooring and GLORYS2v4, ORAS5, GloSea5 and C-GLORSv7 reanalyses data.

Methods and Results. Mooring data were interpolated into a regular grid with the resolutions of 0.25 over longitude and 10 m over depth using the Ordinary Kriging. Unified algorithms for both mooring and reanalysis data were applied to calculate the transports for 1997–2018 in Fram Strait (8°W, 8°E). The mooring and reanalysis time series were compared, and the results were visualized.

Conclusions. It is shown that the ensemble of reanalyses in general underestimates the transports calculated by using the observation data, by 25%. The best agreement between the results obtained from reanalyses and the observation data is obtained for the West Spitsbergen Current core which is well covered by the observation data. It is revealed that the ensemble of models describes the observation data variability the best, and the FOAM and CGLO reanalyses – the greater part of temporal variability of the flows calculated by the mooring data. The data consistency in the winter period (October – March) is shown to be higher than that in the summer one (April – September). That can be related both to the reanalysis imperfections (ice melt accounting) and the season, namely summer, when moorings are usually replaced, which can result in additional errors in combining the time series.

Keywords

Arctic Ocean, Fram Strait, current, water masses, heat and mass transport, moorings, direct measurements, reanalysis

Acknowledgements

The study was carried out with support of the Russian Science Foundation grant № 24-17-00041. The work by A. A. Sokolov was supported by the Russian Science Foundation grant № 24-27-00221.

Original russian text

Original Russian Text © A. V. Smirnov, V. V. Ivanov, A. A. Sokolov, 2024, published in MORSKOY GIDROFIZICHESKIY ZHURNAL, Vol. 40, Iss. 3, pp. 402–425 (2024)

For citation

Smirnov, A.V., Ivanov, V.V. and Sokolov, A.A., 2024. Comparison Analysis of Heat and Mass Transport through Fram Strait Calculated Using the Mooring and Ocean Reanalysis Data. Physical Oceanography, 31(3), pp. 364-386.

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