| Summary: | The excess heat absorbed from the atmosphere has increased the temperature in the upper layers of the ocean (<2,000 m). In the abyss, infrequently repeated ship sections, deep Argo float measurements, and sparse moored observations have found signs of warming in the Southwest Atlantic, possibly linked to changes in the Weddell Sea. We present a new moored temperature time series sampled near the bottom in the Vema Channel, from February 2019 to August 2020. Together with historical data, the combined record confirms the warming of the abyssal waters, with an increase of 0.059°C in potential temperature between January 1991 and August 2020, embedded within intense high-frequency variability. Moreover, the data suggest the possibility of an accelerated warming, with a change in the temperature trend from 0.0016°C yr−1, between the early 1990s and 2005, to 0.0026°C yr−1 afterwards. Fil: Campos, Edmo. Universidade de Sao Paulo; Brasil. American University Of Sharjah.; Emiratos Árabes Unidos Fil: van Caspel, Mathias C. Universidade de Sao Paulo; Brasil. Alfred-Wegener-Institut. Helmholtz-Zentrum für Polar und Meeresforschung; Alemania Fil: Zenk, Walter. Geomar-Helmholtz Centre for Ocean Research Kiel; Alemania Fil: Morozov, Eugene G. Shirshov Institute Of Oceanology; Rusia Fil: Frey, Dmitry I. Shirshov Institute Of Oceanology; Rusia Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Ministerio de Defensa. Armada Argentina. Servicio de Hidrografía Naval; Argentina. Universidad de Buenos Aires; Argentina Fil: Meinen, Christopher S. National Oceanic and Atmospheric Administration. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos Fil: Sato, Olga T. Universidade de Sao Paulo; Brasil Fil: Perez, Renellys C. National Oceanic and Atmospheric Administration. Atlantic Oceanographic and Meteorological Laboratory; Estados Unidos Fil: Dong, Shenfu. National Oceanic and Atmospheric Administration. Atlantic Oceanographic and Meteorological ...
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