Variability of the Wind Stress, the Field of Currents, Wind Stress Curl and Vorticity of Surface Currents in the North Atlantic
https://doi.org/10.15356/0373-2444-2017-1-62-73
Abstract
The role of the Atlantic Ocean in climate changes in the Atlantic-European region determines the importance of studying spatial-temporal variability of the field of currents and the wind field generating the circulation of water in the ocean. The analysis of literature shows that data on seasonal variability of currents in the North Atlantic are controversial and reliable information on the interannual variability of ocean circulation in some regions of the North Atlantic it is impossible to obtain due to the lack of long oceanographic observations. The purpose of this study was clarifying seasonal changes and analyzing of interannual changes of the response of circulation of the upper layer of the North Atlantic on atmospheric forcing (wind stress and wind stress curl) by homogeneous and long-term datasets of re-analysis. Features of seasonal variability of wind stress, velocities of currents and their vorticity in subtropical and subpolar areas of the North Atlantic are confirmed. To the north of 15-20° of north latitude, seasonal variability of wind stress, velocities of currents and their vorticity generally accounts for less than one third of their total variability, the remaining dispersion is due to interannual and decennial fluctuations. In the Subtropical Atlantic in January there was a trend toward increased seasonal variability of wind stress, velocities of currents and anticyclonic wind stress curl and vorticity of surface currents in the second half of the 20th century. In September, since the mid-1970s, there is the tendency towards the weakening of these values, which leads to a long-term increase in the amplitude of the annual cycle. In the Subpolar Atlantic since the late 1950s, during the months with extreme values in the annual cycle there is an increase in seasonal variability of wind stress, velocities of currents and cyclonic wind stress curl and vorticity of surface currents. While, a significant increase in the amplitude of the annual cycle it is not revealed.
About the Authors
A. B. Polonsky
Institute of natural and technical systems, Russian Academy of Science
Russian Federation
Russian Federation
P. A. Sukhonos
Institute of natural and technical systems, Russian Academy of Science
Russian Federation
Russian Federation
References
1. Джиганшин Г.Ф., Полонский А. Б., Крашенинникова С. Б. Влияние межгодовой изменчивости поля ветра в субтропическом круговороте на расходы Гольфстрима//Системы контроля окружающей среды. 2006. С. 296-299.
2. Джиганшин Г.Ф, Полонский А. Б. Низкочастотная изменчивость расходов Гольфстрима: описание и механизмы//Морской гидрофизический журнал. 2009. № 3. С. 30-49.
3. Полонский А.Б., Шокурова И. Г., Сухонос П. А. Изменчивость завихренности напряжения трения ветра над Северной Атлантикой//Экол. безопасность прибреж. и шельфовой зон. 2013. Вып. 27. С. 200-205.
4. Полонский А.Б., Шокурова И. Г., Сухонос П. А. Сезонная изменчивость завихренности касательного напряжения трения ветра и поверхностных течений в Северной Атлантике//Морской гидрофизический журнал. 2015. № 2. С. 43-56.
5. Саркисян A. С. Сорок лет открытию роли совместного эффекта бароклинности и рельефа дна в моделировании климатических характеристик океана//Изв. РАН. Физика атмосферы и океана. 2006. Т. 42. № 5. С. 582-603.
6. Aagaard K. and Coachman L. K. The East Greenland Current north of Denmark Strait: part I//Arctic. 1968. V. 3. № 21. P. 181-200.
7. Alves M.L.G.R. and Colin de Verdiere A. Instability dynamics of a subtropical jet and applications to the Azores Front Current System: eddy-driven mean flow // J. Phys. Oceanogr. 1999. V. 29. № 5. P. 837-864.
8. Bakun A. and Nelson C. S. The seasonal cycle of wind-stress curl in subtropical eastern boundary current regions//J. Phys. Oceanogr. 1991. V. 21. № 12. P. 1815-1834.
9. Balmaseda M.A., Vidard A, and Anderson D. L.T. The ECMWF Ocean Analysis System: ORA-S3 // Mon. Weath. Review. 2008. V. 136. № 8. P. 3018-3034.
10. Boning C.W., Scheinert M., Dengg J., Biastoch A., and Funk A. Decadal variability of subpolar gyre transport and its reverberation in the North Atlantic overturning//Geophys. Res. Lett. 2006. V. 33. L21S01 DOI: 10.1029/2006GL026906
11. Bryden H.L., Longworth H. R., and Cunningham S. A. Slowing of the Atlantic meridional overturning circulation at 25 N//Nature. 2005. V. 438. № 7068. P. 655-657.
12. Bullard R., Dinsmore R., Franceschetti A., Morril P., and Soule F. Report of the International Ice Patrol Service in the North Atlantic Ocean, Season of 1960. Int. Ice Patrol Serv. Washigton, D. C. Bull. 46. 1961. 114 p.
13. Cromwell D., Challenor P. G., New A. L., and Pingree R. D. Persistent westward flow in the Azores Current as seen from altimetry and hydrography//J. Geophys. Res.: Oceans (1978-2012). 1996. V. 101. № 105. P. 11923-11933.
14. Daniault N., Mercier H., and Lherminier P. The 19922009 transport variability of the East Greenland-Irminger Current at 60 N//Geophys. Res. Lett. 2011. V. 38. № 7. L07601, DOI: 10.1029/2011GL046863
15. Fedoseev A. Geostrophic circulation of surface waters on the shelf of north-west Africa//Rapp. P.-V. Reun. Cons. Int. Explor. Mer. 1970. V. 159. P. 32-37.
16. Foldvik A., Aagaard K., and Torresen T. On the velocity field of the East Greenland Current//Deep Sea Res. Part A. Oceanographic Research Papers. 1988. V. 35. № 8. P. 1335-1354.
17. Fuglister F. C. Annual variations in current speeds in the Gulf Stream system//J. Mar. Res. 1951. V. 10. № 1. P. 119-127.
18. Garzoli S.L. and Katz E. J. The forced annual reversal of the Atlantic North Equatorial Countercurrent//J. Phys. Oceanogr. 1983. V. 13. № 11. P 2082-2090.
19. Greatbatch R.J. and Goulding A. Seasonal variations in a linear barotropic model of the North Atlantic driven by the Hellerman and Rosenstein wind stress field//J. Phys. Oceanogr. 1989. V. 19. № 5. P. 572-595.
20. Han G., Lu Z., Wang Z., Helbig J., Chen N., and Young B. Seasonal variability of the Labrador Current and shelf circulation off Newfoundland//J. Geophys. Res. 2008. V. 113. C10013 DOI: 10.1029/2007JC004376
21. Harrison D. E. On climatological monthly mean wind stress and wind stress curl fields over the world ocean//J. Clim. 1989. V. 2. № 1. P. 57-70.
22. Hellerman S. and Rosenstein M. Normal monthly wind stress over the world ocean with error estimates//J. Phys. Oceanogr. 1983. V. 13. № 7. P.1093-1104.
23. Isemer H.-J. and Hasse L. The Bunker Climate Atlas of the North Atlantic Ocean. Vol. 2. Air-Sea Interactions. N.Y.: Springer, 1985. 252 p.
24. Jia Y. Formation of an Azores Current due to the Mediterranean overflow in a modeling study of the North Atlantic//J. Phys. Oceanogr. 2000. V. 30. № 9. P. 2342-2358.
25. Jonsson S. Seasonal and interannual variability of wind stress curl over the Nordic seas//J. Geophys. Res. 1991. V. 96. № C2. P. 2649-2659.
26. Käse R.H., Biastoch A., and Stammer D. B. On the mid-depth circulation in the Labrador and Irminger Seas//Geophys. Res. Lett. 2001. V. 28. № 18. P. 34333436.
27. Klein B. and Siedler G. On the origin of the Azores Current//J. Geophys. Res.: Oceans (1978-2012). 1989. V. 94. № C5. P. 6159-6168.
28. Lavender K.L., Davis R. E., and Owens W. B. Mid-depth recirculation observed in the interior Labrador and Irminger seas by direct velocity measurements//Nature. 2000. V. 407. № 6800. P. 66-69.
29. Lazier J.R.N. and Wright D. G. Annual velocity variations in the Labrador Current//J. Phys. Oceanogr. 1993. V. 23. № 4. P. 659-678.
30. Lohmann K., Drange H., and Bentsen M. A possible mechanism for the strong weakening of the North Atlantic subpolar gyre in the mid-1990s//Geophys. Res. Lett. 2009. V. 36. L15602 DOI: 10.1029/2009GL039166
31. Mayer D.A. and Weisberg R. H. A description of COADS surface meteorological fields and the implied Sverdrup transports for the Atlantic Ocean from 30-Degrees-S to 60-Degrees-N//J. Phys. Oceanogr. 1993. V. 23. № 10. P. 2201-2221.
32. Mountain D. G. Direct measurements in the Labrador Current//J. Geophys. Res.: Oceans (1978-2012). 1980. V. 85. № C7. P. 4097-4100.
33. Myers R.A., Helbig J., and Holland D. Seasonal and interannual variability of the Labrador Current and West Greenland Current//ICES C.M. 1989. V. 100. P. 16-26.
34. Navarro-Perez E. and Barton E. D. Seasonal and interannual variability of the Canary Current//Scientia Marina. 2001. V. 65. № S1. P. 205-213.
35. Niiler P.P., Maximenko N. A., and McWilliams J. C. Dynamically balanced absolute sea level of the global ocean derived from near-surface velocity observations//Geophys. Res. Lett. 2003. V. 30. № 22 DOI: 10.1029/2003GL018628
36. Orvik K.A. and Skagseth O. The impact of the wind stress curl in the North Atlantic on the Atlantic inflow to the Norwegian Sea toward the Arctic//Geophys. Res. Lett. 2003. V. 30. № 17, 1884 DOI: 10.1029/2003GL017932
37. Spall M.A. and Pickart R. S. Wind-driven recirculations and exchanges in the Labrador and Irminger Seas//J. Phys. Oceanogr. 2003. V. 33. № 8. P. 1829-1845.
38. Stommel H. M. The Gulf Stream: a physical and dynamical description. Berkeley and Los Angeles, California: Univ. of California Press, 1958. 248 p.
39. Tomczak M. and Godfrey J. S. Regional oceanography: an introduction. Delhi: Daya Books, 2003. 400 p.
40. Townsend T.L., Hurlburt H. E, and Hogan P. J. Modeled Sverdrup flow in the North Atlantic from 11 different wind stress climatologies//Dynamics of Atmospheres and Oceans. 2000. V. 32. № 3. P. 373-417.
41. Trenberth K.E., Large W. G., and Olson J. G. The mean annual cycle in global ocean wind stress//J. Phys. Oceanogr. 1990. V. 20. № 11. P. 1742-1760.
42. Uppala S.M., Kallberg P. W., Simmons A. J., Andrae U., Da Costa Bechtold V., Fiorino M., Gibson J. K, Hasel- er J., Hernandez A., Kelly G. A., Li X., Onogi K, Saarinen S., Sokka N., Allan R. P., Andersson E., Arpe K., Balmaseda M. A., Beljaars A. C.M., Van De Berg L., Bidlot J., Bormann N., Caires S., Chevallier F., Dethof A., Dragosavac M., Fisher M., Fuentes M., Hagemann S., Holm E., Hoskins B. J., Isaksen L., Janssen P. A.E.M., Jenne R., Mcnally A. P., Mahfouf J.-F., Morcrette J.-J., Rayner N. A., Saunders R. W., Simon P., Sterl A., Tren- berth K. E., Untch A., Vasiljevic D., Viterbo P., and Woollen J. The ERA-40 re-analysis // Quarterly Journal of the Royal Meteorological Society. 2005. V. 131. № 612. P. 2961-3012.
43. Wang C. Variability of the Caribbean low-level jet and its relations to climate//Clim. Dyn. 2007. V. 29. № 4. P. 411-422.
44. Yang H. The subtropical/subpolar gyre exchange in the presence of annually migrating wind and a meandering jet: Water mass exchange//J. Phys. Oceanogr. 1996. V. 26. № 1. P. 115-130.
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For citations:
Polonsky A.B., Sukhonos P.A. Variability of the Wind Stress, the Field of Currents, Wind Stress Curl and Vorticity of Surface Currents in the North Atlantic. Izvestiya Rossiiskoi Akademii Nauk. Seriya Geograficheskaya. 2017;(1):62-73. (In Russ.) https://doi.org/10.15356/0373-2444-2017-1-62-73
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