Interannual variability of thermohaline parameters in the deep Arctic Ocean
https://doi.org/10.7868/S2073667319030031
Abstract
Translated by E.S. Kochetkova
Temperature and salinity variability in the upper 20-meter ocean layer in the 1950–2014 time interval were analyzed on the basis of the observational data. Four typical regions were selected for this study in the central part of the Arctic basin and two regions on its border with the Laptev Sea. The analysis allowed revealing that until the 1990s, when most of the Arctic basin was covered with perennial ice all year round, the temporal variability of the thermohaline parameters in the upper mixed layer in all the considered areas was small throughout the year. Since mid-1990s, multidirectional changes in the thermohaline parameters in the upper layer have been observed in the western and eastern parts of the Arctic basin. In the Western region in the winter season, salinization and cooling of surface waters are happening, whereas in the eastern Arctic, on the contrary, there is strong desalination and a corresponding increase of water temperature. One of the main reasons for the desalination of surface waters in the eastern Arctic is a reduction in the area of perennial ice and its replacement by seasonal one against the background of increased riverine water discharge and change in the atmospheric circulation over the Arctic. The salinization of surface waters in the western Arctic is associated with an increase in the supply of saline Atlantic waters from the Fram Strait and their rise to the surface under conditions of increased seasonality of Arctic sea ice, which refers to an increase in the duration of the melting season.
Supporting agencies: The study was carried out as part of the RFBR project 17-05-41197
About the Authors
V. V. Ivanov
Lomonosov Moscow State University; Arctic & Antarctic Research Institute
Russian Federation
Russian Federation
Moscow; St.-Petersburg
P. N. Golovin
Arctic & Antarctic Research Institute
Russian Federation
Russian Federation
St.-Petersburg
References
1. Stroeve J.C., Serreze M.C., Holland M.M., Ka J.E., Malanik J., Barrett A.P. The arctic’s rapidly shrinking sea ice cover: a research synthesis. Climatic Change. 2012, 110, 3, 1005–1027. doi.org/10.1007/s10584-011-0101-1
2. Morrison J., Kwok R., Perralta-Ferris C., Alkire M., Rigor I., Steele M. Changing Arctic Ocean freshwater pathways. Nature. 2012, 481, 66–70. doi.10.10308/nature10705
3. Konstantinov Yu.B., Grachev K.I. High-latitude air expeditions “North” (1937, 1941–1993). SPb., Gidrometeoizdat, 2000. 176 p.
4. Ivanov V.V., Alekseev V.A., Alekseeva T.A., Koldunov N.V., Repina I.A., Smirnov A.V. Arctic ice cover becomes seasonal? Issledovaniya Zemli iz Kosmosa. 2013, 4, 50–65.
5. McPhee M.G., Proshutinsky A., Morison J.H., Steele M., Alkire M.B. Rapid change in freshwater content of the Arctic Ocean. GRL. 2009, 36, L10602. doi:10.1029/2009GL037525
6. Proshutinsky A., Dukhovskoy D., Timmermans M–L., Krishfield R., Bamber J.L. Arctic circulation regimes. Phil. Trans. R. Soc. 2015, A373, 20140160. http://dx.doi.org/10.1098/rsta.2014.0160
7. Overland J.E, Wang M., Salo S. The recent Arctic warm period. Tellus. 2008, 60A, 589–597.
8. Wang J., Zhang J., Watanabe E., Ikeda M., Mizobata K., Walsh J.E., Bai X., Wu B. Is the Dipole Anomaly a major driver to record lows in Arctic summer sea ice extent? GRL. 2009, 36, L05706. doi:10.1029/2008GL036706
9. Timokhov L.A., Ivanov V.V., Kassens H., Lebedev N.V., Frolov I.E., Helemann E. Climate changes in the dynamic topography and geostrophic circulation of the Arctic Ocean. Doklady Rossiskoy Akademii Nauk. 2018, 480, 3, 1–4.
10. Mauritzen C. Arctic freshwater. Nature Geoscience. 2012, 5, 162–164.
11. Ivanov V.V., Timokhov L.A. Atlantic waters in the Arctic Transpolar system. Russian Meteorology and Hydrology. 2019, 4, 36–53.
12. Timokhov L.A., Ashik I.M., Garmanov A.L., Kirillov S.A., Carp V.Yu., Lebedev N.V., Sokolov V.T. The thermohaline state of the upper layer of the Arctic Ocean in 2012 and the trends of the observed changes. Problemy Arctiki i Antarktiki. 2013, 98, 4, 56–70.
13. Ivanov V., Varentsov M., Matveeva T., Repina I., Artamonov A., Khavina E. Arctic Sea Ice Decline in the 2010s: The Increasing Role of the Ocean-Air Heat Exchange in the Late Summer. Atmosphere. 2019, 10, art. 184. http://dx.doi.org/10.3390/ atmos10040184
14. Cavalieri D., Parkinson C., Gloersen P., Zwally H.J. (updated yearly). Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data. 1979–2011. Version 1.0. 1996, Boulder, Colorado USA: National Snow and Ice Data Center.
15. Nikiforov E.G., Speikher A.O. Patterns of formation of large-scale fluctuations of the hydrological regime of the Arctic Ocean. L., Gidrometeoizdat, 1980. 270 p.
16. Frolov I.E., Gudkovich Z.M., Karklin V.P., Kovalev E.G., Smolyanitsky V.M. Scientific research in the Arctic. T. 2. Climatic changes in the ice cover of the seas of the Eurasian Shelf. SPb., Nauka, 2007. 158 p.
17. Timokhov L.A., Ashik I.M., Carp V.Yu., Cassans H., Kirillov S.A., Polyakov I.V., Sokolov V.T., Frolov I.E., Chernyavskaya E. Extreme changes in temperature and salinity of the Arctic surface layer water in 2007–2009 Oceanography and sea ice. Russia’s contribution to IPY2007/2008. Chief ed. I.E. Frolov. Paulens LLC. Moscow, St.-Petersburg, 2011, 118–137.
18. Polyakov I.V., Pnyushkov A.V., Alkire M.B., Ashik I.M., Baumann T.M., Carmack E.C., Goszczko I., Guthrie J., Ivanov V.V., Kanzow T., Krishfield R., Kwok R., Sundfjord A., Morison J., Rember R., Yulin A. Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin of the Arctic Ocean. Science. 2017, 356, 285–291.
19. Rudels B., Jones P.E., Schauer U., Eriksson P. Atlantic sources of the Arctic Ocean surface and halocline waters. Polar Res. 2004, 23, 2, 181–208.
20. Ivanov V.V., Repina I.A. Mid-winter anomaly of sea ice in the Western Nansen Basin in 2010s. IOP Conf. Ser.: Earth Environ. Sci. 2019, 231, 012024, 1–7. doi:10.1088/1755-1315/231/1/012024
Review
For citations:
Ivanov V.V., Golovin P.N. Interannual variability of thermohaline parameters in the deep Arctic Ocean. Fundamental and Applied Hydrophysics. 2019;12(3):13-25. https://doi.org/10.7868/S2073667319030031
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