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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Ten-year east Asian summer monsoon simulation using a regional climate model (RegCM2)
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Ten-year east Asian summer monsoon simulation using a regional climate model (RegCM2)

机译：使用区域气候模型（RegCM2）进行的十年东亚夏季风季风模拟

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This paper presents a 10-year(1987-1996) summer climate simulation using a regional climate model. The National Center for Atmospheric Research Regional Climate Model (NCAR RegCM2) was designated over east Asia with a horizontal grid spacing of approximately 50 km. The model was initialized at June 1 and integrated up to the end of August for the 10 years. Initial and boundary conditions were the National Centers for Environmental Prediction/NCAR reanalysis data. The 10-year summer mean biases of the simulated ground temperature and daily precipitation rate over the east Asian land area are about -0.1 degreesC and 1.1 mm/d, respectively. Including the ocean area, the bias of the precipitaion rate is significantly reduced to about 0.05 mm/d. More precipitation is simulated in June over the central part of the model domain. The systematic cold biases of the simulated ground temperature take place over the northern part of the domain. The RegCM2 reproduces fairly well the large-scale features associated with the east Asian summer monsoon system, including the subtropical high over the northwestern Pacific Ocean, the planetary-scale trough over Manchuria, the upper level jet and lower-level southerly or southwesterly flow and the precipitation band extended from south China to Japan. The evolution processes of the onset, break phases and abrupt jumps between two adjacent phases of the east Asian summer monsoon are also well simulated. On the other hand, the intensity and magnitude of the large-scale features are not well reproduced. For example, the subtropical high over the ocean is too intensified, in association with the enhancement of the warm air advection in the lower level to the precipitation area. The maximum baroclinic zone and the planetary-scale trough and thus the monsoon rainbelt are shifted northward by 2 degrees -3 degrees compared to reanalysis data. However, some of the systematic errors are hidden in the anomaly analysis over the 10-year RegCM2 climate period. [References: 29]
机译：本文提出了一个使用区域气候模型的十年（1987-1996）夏季气候模拟。国家大气研究区域气候模型国家中心（NCAR RegCM2）被指定为东亚地区，水平网格间距约为50 km。该模型于6月1日初始化，并整合到10年的8月底。初始和边界条件是美国国家环境预测中心/ NCAR再分析数据。东亚陆地地区模拟的地温和日降水率的10年夏季平均偏差分别约为-0.1摄氏度和1.1 mm / d。包括海洋区域在内，降水率的偏差已大大降低至约0.05 mm / d。六月，在模式区域的中央部分模拟了更多的降水。模拟地面温度的系统性冷偏差发生在该区域的北部。 RegCM2很好地再现了与东亚夏季风系统有关的大规模特征，包括西北太平洋上的亚热带高压，满洲上的行星级低谷，上层急流和下层南风或西南风，以及降水带从华南扩展到日本。也很好地模拟了东亚夏季风两个相邻阶段之间的开始，中断阶段和突然跳跃的演化过程。另一方面，不能很好地再现大规模特征的强度和大小。例如，海洋上的副热带高压太强，这与低层到降水区的暖空气平流增强有关。与再分析数据相比，最大斜压带和行星尺度的低谷以及季风雨带向北移动了2度-3度。但是，在10年RegCM2气候周期的异常分析中隐藏了一些系统误差。 [参考：29]

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