Climatology and Teleconnections of Mesoscale Convective Systems in an Andean Basin in Southern Ecuador: The Case of the Paute Basin

Climatology and Teleconnections of Mesoscale Convective Systems in an Andean Basin in Southern Ecuador: The Case of the Paute Basin
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厄瓜多尔南部安第斯盆地中尺度对流系统的气候学和遥相关:以帕特盆地为例

DOI:
10.1155/2018/4259191
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发表时间:
2018
影响因子:
2.9
通讯作者:
J. Mejia
J. Mejia
中科院分区:
地球科学4区
文献类型:
--
作者:
Campozano;K. Trachte;R. Celleri;E. Samaniego;J. Bendix;C. Albuja ;J. Mejia

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中尺度对流系统(MCSs)的气候学,热力学和动力学变量,遥相关影响MCSs的发展进行了评估,在厄瓜多尔安第斯山脉从2000年到2009年的帕特盆地(PB)。MCS发生的季节性表现为双峰模式,在3月至4月(MA)和10月至11月(ON)期间发生率较高,类似于区域降雨的季节性。MCSs的日周期显示出明显的夜间发生,特别是在MA和ON期间。有趣的是,尽管在雨季MCSs的发生率较高,但每月大小的相对频率在全年中保持相当恒定。在西风带东侧,中午到夜间持续的高对流有效位和低对流抑制值可能与MCS的夜间发展有关。发现PB以西的MCS发生与Trans‐Niño指数之间存在显著的正相关关系,这表明ENSO是MCS频率年际变化的重要来源,在温暖的ENSO阶段,MCS的发展增加。在PB以东,由于大西洋副热带高压的变化,MCSs的变化与赤道以南的热带大西洋海表温度异常正相关,当热带太平洋出现ENSO异常时,MCSs的变化与赤道以南的热带大西洋海表温度异常的关系出现主要偏离。
Mesoscale convective systems (MCSs) climatology, the thermodynamic and dynamical variables, and teleconnections influencing MCSs development are assessed for the Paute basin (PB) in the Ecuadorian Andes from 2000 to 2009. The seasonality of MCSs occurrence shows a bimodal pattern, with higher occurrence during March‐April (MA) and October‐November (ON), analogous to the regional rainfall seasonality. The diurnal cycle of MCSs shows a clear nocturnal occurrence, especially during the MA and ON periods. Interestingly, despite the higher occurrence of MCSs during the rainy seasons, the monthly size relative frequency remains fairly constant throughout the year. On the east of the PB, the persistent high convective available potential and low convective inhibition values from midday to nighttime are likely related to the nocturnal development of the MCSs. A significant positive correlation between the MCSs occurrence to the west of the PB and the Trans‐Niño index was found, suggesting that ENSO is an important source of interannual variability of MCSs frequency with increasing development of MCSs during warm ENSO phases. On the east of the PB, the variability of MCSs is positively correlated to the tropical Atlantic sea surface temperature anomalies south of the equator, due to the variability of the Atlantic subtropical anticyclone, showing main departures from this relation when anomalous conditions occur in the tropical Pacific due to ENSO.
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发表时间: 2010
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