The Combined QBO and ENSO Influence on Tropical Cyclone Activity over the North Atlantic Ocean
Por:
Jaramillo, Alejandro, Dominguez, Christian, Raga, Graciela, Quintanar, Arturo I.
Publicada:
1 dic 2021
Resumen:
The Quasi-Biennal Oscillation (QBO) and the El Nino-Southern Oscillation
(ENSO) largely modulate the zonal wind in the tropics. Previous studies
showed that QBO phases produce changes in deep convection through an
increase/decrease in the tropopause height over the tropics and
subtropics. This study investigates the combined effects of QBO and ENSO
on tropical cyclone activity by modulating tropopause height. We found
that tropopause height increases over the Gulf of Mexico, the Caribbean
region, and the Western North Atlantic Ocean during La Nina + QBOW,
allowing deeper tropical convection to develop over those regions. As a
consequence, TC activity over those regions is not only increased in
number but also enhanced in intensity. Conversely, during El Nino +
QBOE, most deep tropical convection is inhibited over those same regions
due to the decrease in tropopause height over the subtropics. We
conclude that QBO effects on TCs and deep convection should be studied
in combination with ENSO. Additional comparative studies using long
record data at high vertical resolution are needed to fully understand
to what extent QBO interacts with ENSO in the lower tropical
stratosphere and upper tropical troposphere.
Filiaciones:
Jaramillo, Alejandro:
Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Dominguez, Christian:
Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Raga, Graciela:
Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
Quintanar, Arturo I.:
Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico
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