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首页> 外文期刊>Journal of Climate >Assessment of the Teleconnection Patterns Affecting July Precipitation in China and Their Forcing Mechanisms in the Met Office Unified Model
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Assessment of the Teleconnection Patterns Affecting July Precipitation in China and Their Forcing Mechanisms in the Met Office Unified Model

机译：评估影响我国7月降水的遥测模式及其在达职统一模型中的迫使机制

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In this study, we evaluate the ability of the MetUM to reproduce the Silk Road (SR) and Europe-China (EC) teleconnection patterns and their relationship with precipitation over China. The SR and EC patterns are the main modes of interannual variability of July upper-tropospheric meridional wind. The three main factors to the formation of these patterns are analyzed: 1) the tropical precipitation anomalies, which act as a forcing mechanism; 2) the emission of Rossby waves in the Mediterranean-Caspian Sea region; and 3) the basic state of the tropospheric jet over Eurasia. It was found that the model has some difficulty reproducing the main modes of variability in atmosphere-only mode (SR and EC pattern correlation of 0.31 and 0.54, respectively) with some improvement in coupled mode (pattern correlations of 0.56 and 0.44, respectively). Relaxation experiments were used to assess the impact that improving circulation in key regions has on the teleconnections. It was found that nudging wind and temperatures in the forcing regions within the tropics improved the Silk Road pattern whereas nudging in the region where the jet transitions between the North Atlantic Ocean and Eurasian continent-correcting the basic state-had the most impact on the EC teleconnection pattern. This suggests that while the Silk Road pattern is more sensitive to changes in the forcing, the Europe-China pattern is more sensitive to the basic state.
机译：在这项研究中，我们评估了Metum重现丝绸之路（SR）和欧洲 - 中国（EC）遥控模式及其与中国降水的关系的能力。 SR和EC模式是7月上层对流层子午线的持续变化的主要模式。形成这些模式的三个主要因素是分析：1）热带降水异常，作为迫使机制; 2）地中海海域罗斯比海域的排放; 3）对欧亚大陆的对流层射流的基本状态。发现该模型在耦合模式（分别为0.56和0.44的图案相关性分别为0.31和0.54）的唯一改进的情况下，这些模型难以在大气模式（SR和EC图案相关性的情况下0.31和0.54的相关性。放松实验用于评估改善关键区循环的影响，这些影响在电信连接中。发现热带地区迫使风和温度在热带地区改善了丝绸之路图案，而在北大西洋和欧亚大陆纠正基本国家的喷射过渡 - 对欧共体产生最大影响的地区电信连接模式。这表明，虽然丝绸之路模式对迫使的变化更敏感，但欧洲 - 中国模式对基本国家更敏感。

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