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首页> 外文期刊>Journal of hydrometeorology >Analysis of a Warm-Season Surface-Influenced Mesoscale Convective Boundary in Northwest Mississippi
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Analysis of a Warm-Season Surface-Influenced Mesoscale Convective Boundary in Northwest Mississippi

机译：西北密西西比州一个暖季表面影响的中尺度对流边界

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摘要

The lower Mississippi River alluvial valley in southeastern Arkansas, northeastern Louisiana, and northwestern Mississippi is characterized by widespread agriculture with few urban areas. Land use is predominantly cultivated cropland with minimal topographic variation; the eastern edge of the alluvial valley is defined by a rapid, although small, change in elevation into a heavily forested landscape, however. This change in land use/land cover has been shown to potentially enhance precipitation through generation of a weak mesoscale convective boundary. This project defines the influence of the land surface on associated precipitation processes by simulating a convective rainfall event that was influenced by regional surface features. Analysis was conducted using a high-resolution simulated dataset generated by the Weather Research and Forecasting Model (WRF). Results show that the strongest uplift coincides with an abrupt lowlevel thermal boundary, developed primarily by a rapid change from sensible to latent heat flux relative to the agricultural and forested areas, respectively. In addition, surface heating over the cultivated landscape appears to destabilize the boundary layer, with precipitation occurring as air is advected across the land cover boundary and the associated thermal gradient. This information can be used to define and predict surfaceinfluenced convective precipitation along agricultural boundaries in other regions where the synoptic environment is weak.
机译：位于阿肯色州东南部，路易斯安那州东北部和密西西比州西北部的密西西比河下游冲积河谷的特点是农业广泛，城市地区很少。土地使用主要是耕地，地形变化最小;冲积谷的东部边缘是由海拔快速变化（虽然很小）定义为茂密的森林景观。研究表明，土地利用/土地覆盖的这种变化可能通过产生弱的中尺度对流边界来增强降水。该项目通过模拟受区域地表特征影响的对流降雨事件来定义土地表面对相关降水过程的影响。使用由天气研究和预报模型（WRF）生成的高分辨率模拟数据集进行分析。结果表明，最强的隆起与突然的低层热边界相吻合，这主要是由相对于农业和林区的显热通量到潜热通量的快速变化而产生的。此外，在耕地上的地表加热似乎使边界层不稳定，随着空气穿过土地覆盖边界和相关的热梯度而出现降水。该信息可用于定义和预测天气条件较弱的其他地区沿农业边界的受表面影响的对流降水。

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