El Nino/Southern Oscillation Dynamics and Decadal Variability

厄尔尼诺/南方涛动（ENSO）的两个方面的动力学将使用历史数据和简单的动力学模型进行研究。第一个问题涉及热带太平洋西部和中部之间的ENSO相互作用，有证据表明，赤道西太平洋的低频海面温度与异常风的蒸发有关。此外，在温暖的ENSO事件期间，赤道西太平洋的对流受到抑制，导致那里的风异常偏东。这些东风将产生一个向西的赤道上升流开尔文波，通过赤道太平洋中部的纬向平流和赤道太平洋东部的上升流，可以作为负反馈减缓甚至可能逆转最初的温暖事件。这种负反馈的影响将用一个耦合的海洋-大气模式来检验。第二个问题将考察在热带太平洋记录中观测到的年代际变率是否可能是ENSO机制使用简单和中间耦合模式的内在组成部分。

Clark 9617304 Two aspects of El Nino/ Southern Oscillation (ENSO), dynamics will be studied using historical data and simple dynamical models. The first problem deals the ENSO interaction between the western and central tropical Pacific where evidence suggests that low-frequency sea surface temperature in the western equatorial Pacific is associated with evaporation by anomalous winds. In addition, the suppressed convection in the western equatorial Pacific during a warm ENSO event results in winds being anomalously easterly there. These Easterlies will generate an equatorial upwelling Kelvin wave with a westward current that, by zonal advection in the central equatorial Pacific and upwelling in the eastern equatorial Pacific, can slow and perhaps reverse the original warm event as a negative feedback. The influence of this negative feedback will be tested with a coupled ocean atmosphere model. The second problem will look at the possibility that the decadal variability observed in the tropical Pacific records is an intrinsic part of the ENSO mechanism using simple and an intermediate coupled models.