A new regional climate model operating at the meso-gamma scale: performance over Europe
A new regional climate model operating at the meso-gamma scale: performance over Europe
复制标题
在中伽玛尺度上运行的新区域气候模型：欧洲的表现
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Colin G. Jones
中科院分区：
文献类型：
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作者：
David Lindstedt;P. Lind;E. Kjellström;Colin G. Jones
众所周知，在传统上被称为“灰色区”（~3-8 km）的分辨率下运行数值天气预报（NWP）和气候模式存在困难，其中深对流既不能完全被模式动力学解决，也不能完全子网格。在这项研究中，我们描述了一个业务NWP模式，和谐，在气候环境（HCLIM），运行在两个不同的分辨率（6和15公里）的10年期（1998-2007年）的性能。该模型有一个对流计划，特别是设计在“灰色区域”制度，这增加了现实主义和准确性的时间和空间演变的对流过程相比，更传统的parametrisations。HCLIM是根据欧洲的标准观测数据集以及高分辨率的区域观测结果进行评估的。不仅区域气候有很好的代表性，而且高阶气候统计量和降水的小尺度空间特征与观测结果也很吻合。与更典型的区域气候模式分辨率相比，在约5公里分辨率下进行气候模拟的附加值主要见于非常罕见的高强度降水事件。6公里分辨率的HCLIM比15公里分辨率更好地再现了这些事件的频率和强度，并且与高分辨率观测更接近。
There are well-known difficulties to run numerical weather prediction (NWP) and climate models at resolutions traditionally referred to as ‘grey-zone’ (~3–8 km) where deep convection is neither completely resolved by the model dynamics nor completely subgrid. In this study, we describe the performance of an operational NWP model, HARMONIE, in a climate setting (HCLIM), run at two different resolutions (6 and 15 km) for a 10-yr period (1998–2007). This model has a convection scheme particularly designed to operate in the ‘grey-zone’ regime, which increases the realism and accuracy of the time and spatial evolution of convective processes compared to more traditional parametrisations. HCLIM is evaluated against standard observational data sets over Europe as well as high-resolution, regional, observations. Not only is the regional climate very well represented but also higher order climate statistics and smaller scale spatial characteristics of precipitation are in good agreement with observations. The added value when making climate simulations at ~5 km resolution compared to more typical regional climate model resolutions is mainly seen for the very rare, high-intensity precipitation events. HCLIM at 6 km resolution reproduces the frequency and intensity of these events better than at 15 km resolution and is in closer agreement with the high-resolution observations.