Lateral Heat and Salt Transports in the Lofoten Basin: Comparison Based on Three Databases
https://doi.org/10.7868/S207366732003003X
Abstract
Based on ECMWF ORAS4 and ORAS5 reanalysis data volumetric flow rate and also heat and salt fluxes and their balances have been calculated on the lateral boundaries of the Lofoten Basin area in the Norwegian Sea. These results have been compared with results based on CMEMS reanalysis GLORYS12V1 data. We revealed, that the most physically justified in the volumetric flow rate is the ORAS5 reanalysis with a 6.0 % discrepancy. Heat balance estimation based on the GLORYS12V1 reanalysis data is more realistic because it shows an increased heat influx that participates in the ocean-atmosphere heat exchange. We conclude that the influx from the southern boundary dominates while the outflux through the eastern boundary is prevalent in the study area, which is mainly determined by the region’s waters dynamics. All of three reanalysis shows an excess of water and salt inflow over outflow for the Lofoten Basin. That indicates the balances for individual basins are not closed and approaches to using these data are limited.
All reanalysis data demonstrate the irregular fluctuations in the temporal variability of the fluxes through the boundaries with the different variance rate. Using the ORAS5 reanalysis data from 1993–2016, we estimate significant linear trends of the studied fluxes through all boundaries, except the northern one. It can be a real proof of increasing transport through the Lofoten Basin. The linear trends of the balance calculated using the ORAS5 data of the same period show the accumulation of water in the region as well as the cooling and accumulation of salt. The linear trends of the balance calculated using the GLORYS12V1 reanalysis demonstrate positive values indicating the warming of the basin.
Keywords
ECMWF ORAS5,
ORAS4,
CMEMS GLORYS12V1,
transport,
heat flow,
salt flow,
Lofoten Basin,
verification,
reanalyses
About the Authors
L. M. Naumov
Russian State Hydrometeorological University; St. Petersburg State University; Shirshov Institute of Oceanology RAS
Russian Federation
Russian Federation
192007, Voronezhskaya Str., 79, St. Petersburg
199034, 7–9, Universitetskaya Emb., St. Petersburg
117997, Nahimovsky Prospekt, 36, Moscow
S. M. Gordeeva
Russian State Hydrometeorological University; St. Petersburg State University; Shirshov Institute of Oceanology RAS
Russian Federation
Russian Federation
192007, Voronezhskaya Str., 79, St. Petersburg
199034, 7–9, Universitetskaya Emb., St. Petersburg
117997, Nahimovsky Prospekt, 36, Moscow
References
1. Dugstad J., Fer I., LaCasce J., Sanchez de La Lama M., Trodahl M. Lateral Heat Transport in the Lofoten Basin: Near‐ Surface Pathways and Subsurface Exchange. Journal of Geophysical Research: Oceans. 2019, 124, 5, 2992–3006. doi: https://doi.org/10.1029/2018jc014774
2. Bosse A., Fer I., Søiland H., Rossby T. Atlantic water transformation along its poleward pathway across the Nordic Seas. Journal of Geophysical Research: Oceans. 2018, 123, doi: https://doi.org/10.1029/2018JC014147
3. Orvik K.A. The deepening of the Atlantic water in the Lofoten Basin of the Norwegian Sea, demonstrated by using an active reduced gravity model. Geophysical Research Letters. 2004, 31, L01306. doi: https://doi.org/10.1029/2003GL018687
4. Spall M.A. Non-local topographic influences on deep convection: An idealized model for the Nordic Seas. Ocean Modelling. 2010, 32, 72–85. doi: https://doi.org/10.1016/j.ocemod.2009.10.009
5. Gascard J.-C., Mork K.A. Climatic importance of large-scale and mesoscale circulation in the Lofonten Basin deduced from Lagrangian observations. Arctic-Subarctic Ocean Fluxes. Defining the Role of the Northern Seas in Climate / Ed. by Dickson R.R., Meincke J., Rhines P. Springer Science, 2008, 131–144.
6. Richards C.G., Straneo F. Observations of Water Mass Transformation and Eddies in the Lofoten Basin of the Nordic Seas. Journal of Physical Oceanography. 2015, 45, 1735–1756. doi: https://doi.org/10.1175/JPO-D-14–0238.1
7. Fedorov A.M., Bashmachnikov I.L., Belonenko T.V. Winter convection in the Lofoten Basin according to ARGO buoys and hydrodynamic modeling. Vestnik of Saint Petersburg University. Earth Sciences. 2019, 64, 3, 491–511. (in Russian). doi: https://doi.org/10.21638/spbu07.2019.308
8. Belonenko T.V., Volkov D.L., Ozhigin V.K., Norden Yu.E. Circulation of waters in the Lofoten Basin of the Norwegian Sea. Vestnik of Saint Petersburg University. 2014, Ser.7, 2, 108–121 (in Russian)
9. Travkin V.S., Belonenko T.V. Seasonal variability of mesoscale eddies of the Lofoten Basin using satellite and model data. Russian Journal of Earth Sciences. 2019, 19, 5, ES5004, doi: https://doi.org/10.2205/2019ES000676
10. Zinchenko V.A., Gordeeva S.M., Sobko Yu.V., Belonenko T.V. Analysis of Mesoscale eddies in the Lofoten Basin based on satellite altimetry. Fundamentalnaya i Prikladnaya Gidrofizika. 2019, 12, 3, 46–54. doi: 10.7868/S2073667319030067
11. Belonenko T.V., Koldunov A.V., Sentyabov E.V., Karsakov A.L. Thermohaline structure of the Lofoten vortex in the Norwegian sea based on field research and hydrodynamic modeling. Vestnik of Saint Petersburg University. Earth Sciences. 2018, 63, 4, 502–519. doi: 10.21638/spbu07.2019.308 (in Russian).
12. Kovalevsky D.V., Bashmachnikov I.L., Alekseev G.V. Formation and decay of a deep convective chimney. Ocean Modelling. 2020, 148, 101583, doi: https://doi.org/10.1016/j.ocemod.2020.101583
13. Malinin V.N., Doganovsky A.M. Earth Hydrosphere. St. Petersburg, Gidrometeoizdat, 2004. 625 p. (in Russian).
14. Doronin Yu.P. Ocean Physics. St. Petersburg, RSMU Publ., 2000, 340 p. (in Russian).
15. Frank J. Millero. History of the Equation of State of Seawater. Oceanography. 2015, 23, 3, doi: https://doi.org/10.5670/oceanog.2010.21
16. McDougall T.J., Barker P.M. Getting started with TEOS-10 and the Gibbs Seawater (GSW) Oceanographic Toolbox. SCOR/IAPSO WG127. 2011. 28 p.
17. Zuo H., Balmaseda M.A., Tietsche S., Mogensen K., Mayer M. The ECMWF operational ensemble reanalysis-analysis system for ocean and sea-ice: a description of the system and assessment. Ocean Science. 2019, 15, 3, 779–808. doi: https://doi.org/10.5194/os-15-779-2019
18. Climate Data Operators. Max-Planck-Institut für Meteorologie (MPI–M). Electronic resource. URL: https://code.mpimet.mpg.de/projects/cdo (date of access: 10.04.2020).
19. Balmaseda M.A., Mogensen K., Weaver A.T. Evaluation of the ECMWF ocean reanalysis system ORAS4. Quarterly Journal of the Royal Meteorological Society. 2013, 139, 1132–1161. doi: https://doi.org/10.1002/qj.2063
20. Global ocean physics reanalysis GLORYS12v1. Copernicus Marine Environment Monitoring Service. Electronic resource. URL: http://marine.copernicus.eu/services-portfolio/access-to-products/?option=com_csw&view=details&product_id=global_reanalysis_phy_001_030 (date of access: 31.01.2020).
21. Dee D.P., Uppala S.M., Simmons A.J., Berrisford P., Poli P., Kobayashi S. et al. The ERA-Interim reanalysis: configuration and performance of the data assimilation system. Quarterly Journal of the Royal Meteorological Society. 2011, 137, 656, 553–597. doi: https://doi.org/10.1002/qj.828
22. Naumov L.M., Gordeeva S.M., Belonenko T.V. Heat, mass and salt fluxes in the Lofoten Basin (Norwegian Sea) estimating using reanalysis data. CITES’2019. International Young Scientists School and Conference on Computational Information Technologies for Environmental Sciences. 2019, 174–179 (in Russian).
23. Fedorov K.N., Pereskokov A.I. Typification of thermohaline stratification conditions in the oceans. Russian Meteorology and Hydrology. 1986, 12, 71–77 (in Russian).
24. On the possible causes of abnormal weather in Russia in the summer of 2010. Hydrometcenter Rossii. Electronic resource. URL: https://meteoinfo.ru/news/1-2009-10-01-09-03-06/3376-10112010-l-r (date of access: 31.01.2020) (in Russian).
25. Stocker T.F. et al. Technical Summary in Climate Change 2013: the Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, 2013).
Review
For citations:
Naumov L.M., Gordeeva S.M. Lateral Heat and Salt Transports in the Lofoten Basin: Comparison Based on Three Databases. Fundamental and Applied Hydrophysics. 2020;13(3):43-55. (In Russ.) https://doi.org/10.7868/S207366732003003X
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