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首页> 外文期刊>Journal of Climate >The amplification of east pacific madden-julian oscillation convection and wind anomalies during June-November
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The amplification of east pacific madden-julian oscillation convection and wind anomalies during June-November

机译：6-11月东太平洋马登-朱利安振荡对流和风距平的放大

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Madden-Julian oscillation (MJO) wind and convection anomalies arc locally amplified over the northeast Pacific warm pool during June-November. Composite analysis using NCEP reanalysis data indicates thai perturbation available potential energy (PARE) production through the positive correlation of intraseasonal temperature and convective diabatic heating anomalies supports the local intensification of MJO-related east Pacific warm pool wind anomalies. PAPE production is maximum during periods of strong MJO convection and low-level westerly wind perturbations, PAPE is converted to perturbation kinetic energy through positive correlations between intraseasonal temperature and vertical velocity. Microwave Sounding Unit (MSU) temperature and NOAA outgoing longwave radiation data support the energy budget results derived from NCEP reanalysis. The amplified east Pacific circulation enhances surface convergence and lalent heat flux anomalies during MJO convective periods. The surface convergence anomalies have a strong frictional component. Iniraseasonal surface convergence and latent heat flux anomalies are strongly correlated (greater than 0.7) wilh the negative outgoing longwave radiation anomalies that is associated with east Pacific MJO convectiveregions. Surface latent heat and convergence variations may therefore be important in modulating MJO convective anomalies over the east Pacific during June-November. Enhanced surface flux and convergence anomalies associated with an enhanced surface circulation may intensify MJO convection, thereby crealing a feedback loop that leads to the further intensification of local wind and convection anomalies. Work with mesoscale or general circulation models is needed to confirm that surface latent heat and convergence variations are indeed important for modulating east Pacific MJO convection. Enhanced MJO convection over the boreal summer east Pacific is accompanied by positive waler vapor anomalies throughout the troposphere. Column precipitable water anomalies from both NASA Water Vapor Project (NVAP) and NCEP reanalysis are in phase with MJO convection anomalies over the east Pacific. These results support the observations of previous studies that the equatorial troposphere must be sufficiently moistened before significant MJO deep convection can occur. The strongest NCEP reanalysis specific humidity anomalies at lower levels are collocated with positive surface latent heat flux and surface convergence anomalies.
机译：6月至11月，东北太平洋暖池上的Madden-Julian振荡（MJO）风和对流异常被局部放大。使用NCEP再分析数据进行的综合分析表明，通过季节内温度与对流绝热加热异常的正相关，泰国扰动可用势能（PARE）的产生支持了与MJO相关的东太平洋暖池风异常的局部加剧。在强MJO对流和低水平西风扰动期间，PAPE产量最大，PAPE通过季节内温度和垂直速度之间的正相关关系转换为扰动动能。微波探测单元（MSU）的温度和NOAA发出的长波辐射数据支持了NCEP重新分析得出的能量预算结果。 MJO对流期间东太平洋环流的放大增强了地表收敛和潜热通量异常。表面会聚异常具有很强的摩擦分量。与东太平洋MJO对流区相关的负向外辐射长波辐射异常与季节内表面收敛和潜热通量异常密切相关（大于0.7）。因此，在6-11月期间，地表潜热和会聚变化对于调节东太平洋MJO对流异常可能很重要。与增强的表面环流相关的增强的表面通量和会聚异常可能会增强MJO对流，从而形成反馈环路，从而导致局部风和对流异常进一步加剧。需要使用中尺度或一般环流模型来确认表面潜热和收敛变化对于调节东太平洋MJO对流确实非常重要。东太平洋北部夏季夏季的MJO对流增强，整个对流层均伴有正的威勒蒸气异常。 NASA水蒸气计划（NVAP）和NCEP再分析的柱状可降水量异常与东太平洋MJO对流异常处于同相状态。这些结果支持了先前研究的观察结果，即在发生明显的MJO深对流之前，必须充分润湿赤道对流层。较低级别的最强NCEP重新分析比湿度异常与正表面潜热通量和表面收敛异常并置。

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