El Nino/Southern Oscillation Dynamics and Decadal Variability

厄尔尼诺/南方涛动动力学和年代际变化

• 批准号: 9617304
• 负责人: Allan Clarke
• 金额: $ 39.8万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9617304&HistoricalAwards=false
• 关键词: El; Nino; Southern; Oscillation; Dynamics

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.

克拉克 9617304 将利用历史数据和简单的动力学模型研究厄尔尼诺/南方涛动的两个方面。 第一个问题涉及热带太平洋西部和中部之间的厄尔尼诺/南方涛动相互作用，有证据表明，赤道西太平洋的低频海表温度与异常风引起的蒸发有关。 此外，在温暖的ENSO事件期间，赤道西太平洋的对流被抑制，导致那里的风是有害的东风。 这些东风将产生一个赤道上涌开尔文波与向西流，赤道太平洋中部的纬向平流和赤道太平洋东部的上涌，可以减缓，也许扭转原来的温暖事件作为一个负反馈。 这种负反馈的影响将用一个耦合的海洋-大气模式来检验。 第二个问题将研究热带太平洋记录中观测到的年代际变率是否可能是使用简单和中间耦合模式的ENSO机制的内在部分。