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2.
Nature ; 570(7761): 319-325, 2019 06.
Article in English | MEDLINE | ID: mdl-31182856

ABSTRACT

Offshore Antarctic polynyas-large openings in the winter sea ice cover-are thought to be maintained by a rapid ventilation of deep-ocean heat through convective mixing. These rare phenomena may alter abyssal properties and circulation, yet their formation mechanisms are not well understood. Here we demonstrate that concurrent upper-ocean preconditioning and meteorological perturbations are responsible for the appearance of polynyas in the Weddell Sea region of the Southern Ocean. Autonomous profiling float observations-collected in 2016 and 2017 during the largest polynyas to form near the Maud Rise seamount since 1976-reveal that the polynyas were initiated and modulated by the passage of severe storms, and that intense heat loss drove deep overturning within them. Wind-driven upwelling of record strength weakened haline stratification in the upper ocean, thus favouring destabilization in 2016 and 2017. We show that previous Weddell polynyas probably developed under similarly anomalous conditions, which are associated with a mode of Southern Hemisphere climate variability that is predicted to strengthen as a result of anthropogenic climate change.


Subject(s)
Climate Change/statistics & numerical data , Ice Cover , Models, Theoretical , Antarctic Regions , Human Activities , Salinity , Temperature , Time Factors
3.
Rev. invest. clín ; 38(4): 383-7, oct.-dic. 1986. tab, ilus
Article in Spanish | LILACS | ID: lil-40652

ABSTRACT

En un estudio clínico de fase II se determinó en 26 mujeres voluntarias la efectividad y seguridad de un método para producir oclusión tubaria no quirúrgica. El procedimiento empleado consistió en la aplicación única de Metilcianoacrilato (MCA) a través del cuello uterino usando el dispositivo FEMCEPT. En todos los casos la maniobra se efectuó sin complicaciones. La efectividad del método fue evaluada por medio de Histerosalpingografía practicada 16 semanas después de la instilación del agente químico. En el 72% de los sujetos (18) se demostró la oclusión tubaria bilateral, en el 28% (7) hubo falla del método, y en el 3,3% (1) no se documentó. A tres años de seguimiento clínico no han ocurrido embarazos en los casos donde se documentó oclusión tubaria bilateral. Se demuestra que es posible ofrecer a la mujer que desea un método anticonceptivo definitivo una técnica simple, segura y efectiva que no requiere internamiento hospitalario, medicación anestésica ni la invasión de la cavidad abdominal


Subject(s)
Adult , Female , Acrylates/therapeutic use , Sterilization, Tubal/methods , Intrauterine Devices
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