Análise da temperatura da região próxima à mesopausa equatorial durante evento de aquecimento abrupto da estratosfera polar

Abstract

During the northern hemisphere winter the stratospheric polar temperature increases abruptly. On some occasions, the stratospheric polar region experience more intense heating, which are accompanied by a reversal in the zonal mean circulation. These events are classified as sudden stratospheric warming. Some studies showed intense connection between the events of abrupt warming of the Northern Hemisphere polar stratosphere and mesospheric cooling of the region, as well as between these events and disturbances in the mesosphere and the ionosphere at middle and low latitudes, including the equatorial region. The objective of this study was to investigate possible effects of sudden warming event in stratospheric polar temperature behavior of the equatorial region near the menopause. In this sense, temperature data estimated from meteor radar measurements obtained at São João do Cariri-PB (7.4°S, 36.5°W) were analyzed together with data from the polar stratosphere, provided by National Centre for Environmental Prediction (NCEP). Analyzing the results it was found that during the sudden stratospheric warming major the mesopause temperatures on the São João do Cariri are lower than during the stratospheric warming events considered minor. Also was verified an anti-correlation between the equatorial mean mesopause temperature and the temperature in the polar cap (poleward of 60 N) at 10 hPa, during Sudden Stratospheric Warming Major events.