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The Combined QBO and ENSO Influence on Tropical Cyclone Activity over the North Atlantic Ocean
被引:5
|作者:
Jaramillo, Alejandro
[1
]
Dominguez, Christian
[1
]
Raga, Graciela
[1
]
Quintanar, Arturo I.
[1
]
机构:
[1] Univ Nacl Autonoma Mexico, Inst Ciencias Atmosfera & Cambio Climatico, Mexico City 04510, DF, Mexico
来源:
关键词:
QBO;
ENSO;
tropical cyclones;
tropopause height;
deep convection;
QUASI-BIENNIAL OSCILLATION;
INTERANNUAL VARIABILITY;
STRATOSPHERE;
TROPOSPHERE;
REANALYSES;
D O I:
10.3390/atmos12121588
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
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.
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页数:15
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