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Differences in the Tropical Convective Activities at the Opposite Phases of the Quasi-Biennial Oscillation

التفاصيل البيبلوغرافية
العنوان: Differences in the Tropical Convective Activities at the Opposite Phases of the Quasi-Biennial Oscillation
المؤلفون: Jin Haeng Lee, Hye-Yeong Chun, Min Jee Kang
المصدر: Asia-Pacific Journal of Atmospheric Sciences. 55:317-336
بيانات النشر: Springer Science and Business Media LLC, 2018.
سنة النشر: 2018
مصطلحات موضوعية: Quasi-biennial oscillation, Convection, Atmospheric Science, 010504 meteorology & atmospheric sciences, 0207 environmental engineering, Zonal and meridional, 02 engineering and technology, 01 natural sciences, Convective available potential energy, Troposphere, La Niña, Climatology, Outgoing longwave radiation, Precipitation, 020701 environmental engineering, Geology, 0105 earth and related environmental sciences
الوصف: Differences in convective activities in the tropical region (30°S–30°N, 180°E–180°W) during different phases of the quasi-biennial oscillation (QBO) are investigated over 32 years (1979–2010) using five metrics representing tropical convection: (i) precipitation and (ii) outgoing longwave radiation from observations and (iii) convective available potential energy (CAPE), (iv) deep convective heating rate, and (v) convective cloud top pressure from reanalysis data. The easterly (QBOE) and westerly (QBOW) phases of the QBO are defined using the zonal wind anomaly from the monthly climatology at 50 hPa. During the QBOE (QBOW), the convective activities are intensified (weakened) over the Maritime Continent and weakened (intensified) over the equatorial eastern and central Pacific. Therefore, the zonal mean values of the five metrics averaged over chronically convective regions show stronger convective activities during the QBOE than during the QBOW, while the opposite is true for the whole tropical region. Composite analyses are also performed during the neutral, El Nino, and La Nina periods. In the neutral period, the convective activities during QBOE are stronger than during QBOW except in the equatorial region (10°S–10°N). The convective activities over the Maritime Continent (central and eastern Pacific) are enhanced when La Nina and the QBOE (El Nino and the QBOW) occur simultaneously. All metrics show similar pattern to one another, implying that the metrics from reanalysis data represent the variations in the convective activities with respect to the QBO reasonably well. Among the five metrics, the CAPE is most sensitive to the QBO phase, likely because the virtual temperature in the upper troposphere is modulated by anomalous meridional circulations induced by different QBO phases.
تدمد: 1976-7951
1976-7633
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::cb794f133b0e611ecbe32dc141ec42cc
https://doi.org/10.1007/s13143-018-0096-x
حقوق: CLOSED
رقم الأكسشن: edsair.doi...........cb794f133b0e611ecbe32dc141ec42cc
قاعدة البيانات: OpenAIRE
الوصف
تدمد:19767951
19767633