Numerical simulation of the large‐scale North American monsoon water sources
Numerical simulation of the large‐scale North American monsoon water sources
复制标题
DOI：
10.1029/2002jd003095
复制
发表时间：
2003-08
影响因子：
--
通讯作者：
M. Bosilovich;Y. Sud;S. Schubert;G. Walker
中科院分区：
文献类型：
--
作者：
M. Bosilovich;Y. Sud;S. Schubert;G. Walker
[1]一个包括水汽示踪剂诊断在内的大气环流模式被用来描绘北美季风降水的主要水汽来源。以1度水平分辨率和随时间变化的海表温度进行的15年模式模拟能够得到合理的季风降水大尺度特征。在墨西哥季风的核心，大陆水源为降水提供了大量的水。远离墨西哥季风（墨西哥东部和德克萨斯州），大陆源通常随着季风的发生而减少。热带大西洋的水源对南部大平原各州的影响增加，在季风开始时，那里的总降水量减少。太平洋源确实对季风有贡献，但在开始后往往较弱。评估季风的发展、季风开始前的土壤水分和地表蒸发与最终的季风强度无关。然而，最强烈的季风确实比最不强烈的季风使用更多的当地水源，但只是在季风开始之后。这表明降水再循环是影响季风强度的重要因素。
[1] A general circulation model that includes water vapor tracer (diagnostics is used to delineate the dominant sources of water vapor for precipitation during the North American monsoon. A 15-year model simulation carried out with 1-degree horizontal resolution and time-varying sea surface temperature is able to produce reasonable large-scale features of the monsoon precipitation. Within the core of the Mexican monsoon, continental sources provide much of the water for precipitation. Away from the Mexican monsoon (eastern Mexico and Texas), continental sources generally decrease with monsoon onset. Tropical Atlantic Ocean sources of water gain influence in the southern Great Plains states, where the total precipitation decreases during the monsoon onset. Pacific Ocean sources do contribute to the monsoon but tend to be weaker after onset. Evaluating the development of the monsoons, soil water and surface evaporation prior to monsoon onset do not correlate with the eventual monsoon intensity. However, the most intense monsoons do use more local sources of water than the least intense monsoons, but only after the onset. This suggests that precipitation recycling is an important factor in monsoon intensity.