Наибольшее число профилей с глубинами ВКС, превышающими 300 м, по данным MITgcm наблюдаются в марте, в то время как по данным буев Argo - в феврале. К сожалению, количество профилей Argo в данном регионе все еще недостаточно для получения репрезентативной картины, с 2001 по 2017 г. наблюдалось только 12 профилей с глубиной ВКС, превышающей 1000 м, поэтому говорить о какой-либо статистической значимости не представляется возможным. В целом за последние годы (2011-2017 гг.) наблюдается значительное увеличение количества наблюдений, в основном как раз за счет буев Argo. Это обстоятельство позволяет надеяться, что в ближайшем будущем мы сможем иметь необходимое число контактных измерений для получения репрезентативных оценок.
Литература
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23. Raj, R. P., Chafik, L., Nilsen, J. E. 0., Eldevik, T., Halo, I., 2015. The Lofoten Vortex of the Nordic Seas. Deep- Sea Res 196, 1-14.
24. Richards, C. G., Straneo, F., 2015. Observations of Water Mass Transformation and Eddies in the Lofoten Basin of the Nordic Seas. J. Phys. Oceanography 45, 1735-1756. https://doi.org/10.1175/JPO- D-14-0238.1.
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26. S0iland, H., Chafik, L., Rossby, T, 2016. On the long-term stability of the Lofoten Basin Eddy. J. Geophys. Res. Oceans 121, 4438-4449. https://doi.org/10.1002/2016JC011726.
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28. Volkov, D.L., Kubryakov, A.A., Lumpkin R., 2015. Formation and variability of the Lofoten basin vortex in a high-resolution ocean model. Deep-Sea Res. I (105), 142-157. https://doi.org/10.1016/j. dsr.2015.09.001.
29. Yu, L. -S., Bosse, A., Fer, I., Orvik, K. A., Bruvik, E. M., Hessevik, I., Kvalsund, K., 2017. The Lofoten Basin eddy: Three years of evolution as observed by Seagliders. J. Geophys. Res. Oceans 122, 6814-6834, https://doi.org/10.1002/2017JC012982.
30. Федоров Александр Михайлович
31. Башмачников Игорь Львович
32. Белоненко Татьяна Васильевна
33. Winter convection in the Lofoten Basin according to ARGO buoys and hydrodynamic modeling
A. M. Fedorov1,2, I. L. Bashmachnikov1,2, T. V. Belonenko1
34. St. Petersburg State University,
35. 7-9, Universitetskaya nab., St. Petersburg, 199034, Russian Federation
36. Scientific Foundation "Nansen International Center for the Environment and Remote Sensing",
37. 14, 7-ya liniia, V. O., St. Petersburg, 199034, Russian Federation
38. In the center of the Lofoten Basin in the Norwegian Sea is located a unique natural phenomenon: the quasi-permanent anticyclonic Lofoten vortex (LV). Winter deep convection is a necessary condition for its stability and one of the main mechanisms of its existence, as it creates favorable conditions for its annual regeneration. Another mechanism to maintain a high anticyclonic vorticity in the center of the basin is the capture of mesoscale eddies that break away from the Norwegian Current. Despite the fact that the important role of deep convection in the mechanisms of annual regeneration of the LV is generally recognized, today in the scientific community there is no consensus on the intensity of winter convection in the region. We estimate a depth of mixed layer (MLD) in the Lofoten Basin. We use the method formulated by Dukhovskoy for estimation. Unlike other known methods, this method does not have any predetermined criterion of density difference, and a necessary rule is determined by the features of the profile itself. We compared estimation of MLD in the Lofoten Basin according to MITgcm data and ARGO buoys data. Estimates of the MLD and the spatial distribution of their maximum values are obtained for the Lofoten Basin. The spatial distribution of Argo profiles is considered. It is shown that T-S diagrams constructed on these profiles are characterized by a pronounced homogeneity and a slight change in density inside the Lofoten vortex (LV) in contrast to the profiles located outside the vortex. The LV area coincides completely with the region of the highest values of MLD, and this proves the key role of deep convection
39. in the existence of an anticyclonic vortex in the center of the basin, as well as the need for its study. Graphs of the spatial distribution of MLD in excess of 300 and 500 m are analyzed. Keywords: Norwegian Sea, Lofoten vortex, Lofoten Basin, deep convection, ARGO, mixed layer depth, MITgcm, MLD.
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