中文摘要：

2014年2~3月,在赤道西太平洋出现西风事件后,赤道东太平洋产生了显著的暖海表温度异常（SSTA）,标志着一次El Ni？o事件开始发展,但随着4月份之后西风事件的减弱消亡,赤道东太平洋暖SSTA也随之衰减,指示着2014年El Ni？o事件的发展在6~8月停滞.资料分析表明,2014年2月,来自印度洋的MJO湿位相到达赤道西太平洋后,西风事件产生,触发了2014年El Ni？o事件.3月初,MJO干位相传播至赤道西太平洋后,西风事件开始减弱.3月中旬以后,东传MJO信号明显减弱,这时赤道西太平洋海表东风异常的发展维持与赤道西-中太平洋SSTA的纬向梯度联系紧密.在MJO信号消亡后,赤道西太平洋的海表异常东风通过风-蒸发反馈作用令当地暖SSTA逐渐加强,降低了局地海平面气压;同时该异常东风令赤道中太平洋混合层出现了明显的异常冷平流,抑制了赤道中太平洋的持续增暖,使局地海平面气压升高,从而加大了赤道西-中太平洋的纬向海平面气压梯度负异常,使得赤道西太平洋的表面异常东风维持加强.这种赤道西太平洋表面异常东风和赤道西-中太平洋SSTA纬向梯度异常的正反馈能够维持到8月份,导致西风事件减弱消失,造成El Ni？o事件的发展停滞.

英文摘要：

The E1 Nifio event in 2014 starts with the substantial warm sea surface temperature anomaly （SSTA） in the equatorial eastern Pacific, following the westerly wind event （WWE） over equatorial western Pacific from February to March 2014. But it is suspended from June to August after the warm SSTA in equatorial eastern Pacific weakening in April when the WWE disappears. Results show that the 2014 E1 Nino event is triggered by the WWE, which is induced by the wet phase of MJO propagating eastward from the equatorial Indian Ocean in February. In early March the dry phase of MJO arrives at equatorial western Pacific to weaken the WWE. And the MJO is decayed evidently after mid March. Afterwards the anomalous easterly over equatorial western Pacific is determined by the zonal SSTA gradient in equatorial western-central Pacific. After the MJO disappearance, the anomalous surface easterly could warm the local SST via the wind-evaporation feedback to enhance the sea surface depression in situ. Thus the evident cold advection anomalies are formed in the mixed layer of equatorial central Pacific, where the continuous wanning is prevented to increase the local sea surface pressure. As a result, a negative zonal gradient of sea surface pressure anomalies is enhanced over the equatorial western-central Pacific, developing the anomalous easterly over the equatorial western Pacific. Such positive feedback between the easterly anomalies over equatorial western Pacific and the zonal SSTA gradient in equatorial western-central Pacific maintains from June to August 2014, when the El Nifio event is suspended with the absence of WWE.