Analysis of the Reemergence of Winter Anomalies of Upper Ocean Characteristics in the North Atlantic from Reanalysis DataстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 1 сентября 2021 г.
Аннотация:On the basis of data from reanalysis and objective analysis for the second half of the 20th century,it is confirmed that the reemergence of anomalies of the characteristics of the upper mixed layer (UML) during the next year after their occurrence is possible in most of the North Atlantic (NA). Exceptions are regions near the western boundary currents and south of 15° N. The extracted signal is very pronounced in the leading empirical orthogonal functions (EOFs) of the UML temperature and mixed-layer depth, with contributions to the total variance of 17.9 and 23.9%, respectively, thus indicating the importance of this process in generating the anomalies of the upper ocean characteristics. The leading EOFs of the UML temperature and mixed-layer depth for 1959–2011, after the removal of third-order polynomials and the annual cycle, have a well-known tripole structure associated with the North Atlantic Oscillation. The EOF analysis in the time–depth plane for the Sargasso Sea and the northeastern NA demonstrates the process of reemergence of temperature anomalies at the ocean surface. The temperature anomalies formed throughout the UML in the period of its greatest winter deepening in February–March persist at depths of 50–200 m for the Sargasso Sea and 50–300 m for the northeastern NA throughout the year. These deep anomalies emerge at the surface in December, the period of the beginning of winter mixing. Subsurface temperature anomalies for 15 months (January–March of the next year) extend deep to the ocean, where they finally dissipate.