Synoptic forcing associated with extreme precipitation events over Southeastern South America as depicted by a CORDEX FPS set of convection-permitting RCMs
Synoptic forcing associated with extreme precipitation events over Southeastern South America as depicted by a CORDEX FPS set of convection-permitting RCMs
复制标题
与南美洲东南部极端降水事件相关的天气强迫，由 CORDEX FPS 允许对流的 RCM 组描述
作者：
A. Lavin;M. Feijoó;S. Solman;J. Fernández;R. P. da Rocha;M. Bettolli
南美洲东南部(SESA)是深部对流的显著发现区。这主要是因为安第斯山脉很近，这最终决定了它们的规模和强度。在这项工作中，我们使用了一套允许对流(水平分辨率为4公里)的区域气候模式来探索它们再现在拉普拉塔盆地引发深对流的天气强迫的能力。这项研究考虑在两个不同的时间尺度上模拟三个极端对流降水事件。一方面，在每个事件发生前几个小时开始进行短期模拟，持续时间为3-4天。另一方面，作为区域气候模拟，一个为期6个月的模拟，其中包括三个选定的事件。与参数化对流不同，允许对流的分辨率不仅加强了事件，而且通过调制低层大气环流改变了最大降水的位置。无论模式和时间尺度如何，垂直积分的水汽通量辐合成为深层湿对流的显著足迹。定量分析了这些模式在重现观测降水方面的性能。这项技能取决于空间尺度。在短期模拟中，结果取决于病例。然而，对长期模拟中的多个事件的分析表明，总的来说，允许对流的分辨率更好地捕捉到了SESA极端降水的空间分布。这项研究包括该地区第一个允许对流模拟的多模式集合，为进一步分析提供更完整的集合以更好地理解这里提供的结果奠定了基础。
Southeastern South America (SESA) stands out as a remarkable region of occurrence of deep convection. This is mainly due to the proximity of the Andes, which eventually determine their magnitude and intensity. In this work, we used a set of convection-permitting (4 km horizontal resolution) regional climate models to explore their ability to reproduce the synoptic forcings that trigger deep convection over La Plata basin. The study considered simulating three extreme convective precipitation events in two different timescales. On one hand, a short-term simulation initiated a few hours before the onset of each event, spanning 3–4 days. On the other hand, as regional climate modelling, a 6-month simulation that includes the three selected events. In contrast to parameterized convection, the convection-permitting resolutions not only intensified the events, but also modified the location of the maximum precipitation by modulating the low-level atmospheric circulation. Vertically integrated moisture flux convergence emerged as a noticeable footprint of deep moist convection, regardless of the model and timescale. The performance of the models in reproducing the observed precipitation was also quantitatively analyzed. The skill depends on the spatial scale. The results were case-dependent in the short-term simulations. However, an analysis over multiple events in the long-term simulations revealed that, in general, convection-permitting resolutions better capture the spatial distribution of the extreme precipitation in SESA. The study comprises the first multi-model ensemble of convection-permitting simulations over the region, a seed for a further analysis with a more complete ensemble to better understand the results presented here.
影响因子：
9.8
作者：
P. Nguyen;E. Shearer;H. Tran;Mohammed Ombadi;N. Hayatbini;T. Palacios;P. Huynh;D. Braithwaite;G. Updegraff;K. Hsu;B. Kuligowski;W. Logan;S. Sorooshian
通讯作者：
P. Nguyen;E. Shearer;H. Tran;Mohammed Ombadi;N. Hayatbini;T. Palacios;P. Huynh;D. Braithwaite;G. Updegraff;K. Hsu;B. Kuligowski;W. Logan;S. Sorooshian
影响因子：
4.6
作者：
Coppola, Erika;Sobolowski, Stefan;Warrach-Sagi, K.
通讯作者：
Warrach-Sagi, K.
影响因子：
3.2
作者：
Woodhams, Beth J.;Birch, Cathryn E.;Boyd, Douglas F. A.
通讯作者：
Boyd, Douglas F. A.