The short-lived events of high SST are called hot events (HEs) and can only be generated under the conditions of large daily heat gain due to strong solar radiation and weak wind. We investigated the thermal structure below HEs in the western equatorial Pacific by using in situ data obtained from TAO/TRITON buoys. We found that the occurrence of HEs can be identified by the typical vertical thermal structure within the isothermal layer. During the development stage of a HE, heat is accumulated in the surface layer due to strong solar radiation and weak wind, increasing temperature and creating strong stratification in the upper layer. During the decay stage, strong westerly winds induce current convergence which transports the heat from the upper layer to the deeper layer. Thus, temperature decreases at the surface and increases in the deeper layer. Furthermore, this mechanism indicates the important role of HEs in maintaining the warm isothermal layer in the western Pacific warm pool. The more HEs occur, the more heat in the surface layer gained from solar radiation is transported to the deeper layer. This process makes areas of frequent HE occurrences coincident with areas of warm pool. Since surface winds control the heat accumulation and heat transport in the isothermal layer by influencing current divergence and latent heat flux, surface winds become the key factor for the occurrence of HEs and the formation of the thermal structure in the Pacific warm pool.

中文翻译：

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高温事件的热力结构及其在维持西太平洋暖池中的等温层中的可能作用

高SST的短暂事件称为高温事件（HE），仅在由于强烈的太阳辐射和弱风而导致每日热量大量增加的情况下产生。我们使用从TAO / TRITON浮标获得的原位数据调查了赤道西太平洋HEs下方的热结构。我们发现，HE的发生可以通过等温层内的典型垂直热结构来识别。在HE的发展阶段，由于强烈的太阳辐射和弱风，热量在表层积聚，温度升高并在上层形成强烈的分层。在衰减阶段，强西风会引起电流收敛，从而将热量从上层传输到更深层。从而，表面温度降低，而深层温度升高。此外，该机制表明HE在维持西太平洋暖池中的等温层方面具有重要作用。发生的HE越多，从太阳辐射中获得的表层热量就越传递到更深的层。此过程使频繁发生HE的区域与温池区域重合。由于表面风通过影响电流散度和潜热通量来控制等温层中的热量积聚和热传递，因此表面风成为HEs发生以及太平洋暖池中热结构形成的关键因素。从太阳辐射中获得的表层热量越多，传递到更深的层。此过程使频繁发生HE的区域与温池区域重合。由于表面风通过影响电流散度和潜热通量来控制等温层中的热量积聚和热传递，因此表面风成为HEs发生以及太平洋暖池中热结构形成的关键因素。从太阳辐射中获得的表层热量越多，传递到更深的层。此过程使频繁发生HE的区域与温池区域重合。由于表面风通过影响电流散度和潜热通量来控制等温层中的热量积聚和热传递，因此表面风成为HEs发生以及太平洋暖池中热结构形成的关键因素。