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首页> 外文期刊>Acta Meteorologica Sinica >Multi-year simulation of the East Asian Monsoon and Precipitation in China using a Regional Climate Model and Evaluation
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Multi-year simulation of the East Asian Monsoon and Precipitation in China using a Regional Climate Model and Evaluation

机译：利用区域气候模型和评估对中国东亚季风和降水进行多年模拟

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摘要

By using the regional climate model (RegCM_NCC), East Asian monsoon and precipitation over China during 1998 to 2002 are simulated. Results show that the model can well reproduce the seasonal patterns of mean circulation as well as the intensity and seasonal march of the East Asian monsoon. The simulated onset or retreat time of the West Pacific subtropical high, and the intensity and location of the South Asian high are consistent with the fact. The spatial distribution and transport of moisture in lower layer are also well simulated. The seasonal variations of regional rainfall and temperature are reproduced in the model, with three northward shift time and intensity of the rain belts over the sub-regions (such as Mid-Lower Yangtze basins and South China) well corresponding to the observation. However, the simulated summer monsoon is stronger compared with NCEP reanalysis fields, with the location of subtropical high being further north by 2-3 degrees than normal. Error evaluation shows that there is a discernible systematic bias in the simulated mean circulation pattern, with air temperature bias being positive over the land and negative over the ocean in the lower troposphere in summer. The systematic bias exaggerates the summer temperature difference between the land and ocean, which may be a main responsible factor for the stronger simulated summer monsoon, thus resulting in the overestimated rainfall in North China and it can not reflect well the abnormal rainfall distribution in these 5 years. The deficiency may be mainly contributed to the complex topography and cloud-radiation parameterization scheme. The analyses also indicate that it is difficult to simulate the persistent abnormal precipitation pattern over China. It is necessary to improve the model's capability further.
机译：利用区域气候模式（RegCM_NCC），模拟了1998-2002年中国的东亚季风和降水。结果表明，该模型可以很好地再现东亚季风的平均环流季节格局，强度和季节进行。西太平洋副热带高压的模拟开始或撤退时间，以及南亚高压的强度和位置与这一事实是一致的。下层水分的空间分布和传输也得到了很好的模拟。该模型再现了区域降雨和温度的季节性变化，次区域（如长江中下游盆地和华南地区）的雨带向北移动的三个时间和强度与观测值非常吻合。然而，与NCEP再分析场相比，模拟的夏季季风更强，亚热带高压的位置比正常情况更北偏2-3度。误差评估表明，在模拟的平均环流模式中存在明显的系统偏差，夏季夏季对流层低层的空气温度偏差在陆地上为正，在海洋上为负。系统性偏差夸大了陆地与海洋之间的夏季温差，这可能是模拟夏季季风较强的一个主要因素，从而导致华北地区的降雨被高估，无法很好地反映这五个地区的异常降雨分布。年份。该缺陷可能主要是由于复杂的地形和云辐射参数化方案所致。分析还表明，很难模拟中国持续的异常降水模式。有必要进一步提高模型的能力。

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