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Air masses, Atmospheric motion

机译:空气群众,大气动作

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El Nino flavors influence Subtropical South American (SSA) rainfall through the generation of one or two quasi-stationary Rossby waves. However, it is not yet clear whether the induced wave trains depend on the El Nino pattern and/or its intensity. To investigate this, we performed different sensitivity experiments using an Atmospheric General Circulation Model (AGCM) which was forced considering separately the Canonical and the El Nino Modoki patterns with sea surface temperature (SST) maximum anomalies of 1 and 3 °C. Experiments with 3 °C show that the Canonical El Nino induces two Rossby wave trains, a large one emanating from the western subtropical Pacific and a shorter one initiated over the central-eastern subtropical South Pacific. Only the shorter wave plays a role in generating negative outgoing longwave radiation (OLR) anomalies over SSA. On the other hand, 3 °C El Nino Modoki experiments show the generation of a large Rossby wave train that emanates from the subtropical western south Pacific and reaches South America (SA), promoting the development of negative OLR anomalies over SSA. Experiments with 1 °C show no impacts on OLR anomalies over SSA associated with El Nino Modoki. However, for the Canonical El Nino case there is a statistically significant reduction of the OLR anomalies over SSA related to the intensification of the upper level jet stream over the region. Finally, our model results suggest that SSA is more sensitive to the Canonical El Nino, although this result may be model dependent.
机译:El Nino Flavors通过产生一个或两个准固定rossby波影响亚热带南美(SSA)降雨。然而,尚不清楚诱导波动列车是否依赖于EL NINO模式和/或其强度。为了研究这一点,我们使用大气通用循环模型(AGCM)进行了不同的敏感性实验,该模型(AGCM)被迫分别考虑规范和EL NINO Modoki模式,其海表面温度(SST)最大异常为1和3°C。 3°C的实验表明,规范El Nino诱导了两个Rossby波动列车,这是来自西部亚热带太平洋的大量散发,并在中央东部亚热带南太平洋上发起了较短的一个。只有较短的波浪在通过SSA上产生负输出长波辐射(OLR)异常时起作用。另一方面,3°C El Nino Modoki实验表明,从亚热带西南南太平洋和南美(SA)发出的大型Rossby波动火车的产生,促进SSA的负面OLR异常的发展。 1°C的实验显示与el Nino Modoki相关的SSA上的OLR异常的影响。然而,对于规范EL NINO案例,在该区域上的上层喷射流的强化有关的统计上显着降低了SSA。最后,我们的模型结果表明SSA对规范EL NINO更敏感,尽管此结果可能是依赖的模型。

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    《Oceanographic Literature Review》 |2020年第6期|1188-1191|共4页
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