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首页> 美国卫生研究院文献>Scientific Reports >Nonlinear response of Northern Hemisphere stratospheric polar vortex to the Indo–Pacific warm pool (IPWP) Niño
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Nonlinear response of Northern Hemisphere stratospheric polar vortex to the Indo–Pacific warm pool (IPWP) Niño

机译：北半球平流层极涡对印度-太平洋暖池（IPWP）Niño的非线性响应

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Variations in tropical sea surface temperatures (SST) have pronounced impacts on the stratospheric polar vortex, with the role of El Niño being the focus of much research interest. However, the Indo–Pacific warm pool (IPWP), which is the warmest body of seawater in the world, has received less attention. The IPWP has been warming in recent years. This paper presents for the first time the remarkable nonlinearity in Northern Hemisphere (NH) stratospheric circulation and temperature response to IPWP warming (the so-called IPWP Niño) in boreal winter. The magnitude of NH stratospheric vortex weakening is strong and significant in case of moderate IPWP Niño, but is weak and insignificant in strong IPWP Niño case. This phenomenon is robust in both the historical simulations and observations. An idealized model experiments forced with linear varying SST forcing in the IPWP region isolate the nonlinearities arising from IPWP Niño strength. Westward extension of precipitation into the Maritime Continent drives attenuation and westward shift of extratropical waves during strong IPWP Niño events. Linear wave interference analysis reveals this leads to weak interference between the climatological and anomalous stationary waves and thereby a weak response of the stratospheric vortex. These findings imply a distinct stratospheric vortex response to the IPWP Niño, and provide extended implications for the surface climate in the NH.
机译：热带海面温度（SST）的变化对平流层极涡产生了显着影响，厄尔尼诺现象的作用成为许多研究兴趣的焦点。但是，作为世界上最温暖的海水的印度太平洋环流池（IPWP）受到的关注较少。近年来，IPWP一直在升温。本文首次介绍了北半球（NH）平流层环流的显着非线性和北方冬季IPWP变暖（所谓的IPWPNiño）的温度响应。 NH平流层涡旋减弱的强度在中等IPWPNiño的情况下是强而显着的，但是在IPWPNiño较强的情况下是弱而微不足道的。在历史模拟和观察中，这种现象都是可靠的。在IPWP区域中，采用线性变化的SST强迫进行的理想模型实验可以隔离IPWPNiño强度引起的非线性。在强IPWPNiño事件中，降水向西扩展到海事大陆，推动了温带波的衰减和西移。线性波干扰分析表明，这会导致气候波和异常固定波之间的干扰较弱，从而导致平流层涡旋的响应较弱。这些发现暗示平流层对IPWPNiño的涡旋响应，并为NH的地表气候提供了扩展的含义。

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