Multiscale Variability of the Flow during the North American Monsoon Experiment
Multiscale Variability of the Flow during the North American Monsoon Experiment
复制标题
北美季风实验期间流量的多尺度变化
DOI：
10.1175/jcli4087.1
复制
发表时间：
2007
影响因子：
4.9
通讯作者：
Richard K. Taft
中科院分区：
文献类型：
--
作者：
Richard H. Johnson;P. Ciesielski;B. McNoldy;P. Rogers;Richard K. Taft
2004年北美季风试验（NAME）为研究北美季风的结构和演变提供了一个前所未有的观测网络。本文利用增强观测网的大气探测资料，重点研究了从大尺度到中尺度的NAME过程中气流的多尺度特征。2004年NAME地区夏季风的开始伴随着墨西哥北部上空的高层反气旋或季风高压向美国西南部的典型北移，但2004年这种转移发生的时间略晚于正常，季风高压也没有像往常那样向北延伸。因此，美国西南部的降水略低于正常水平，尽管大平原上空的低槽增加导致新墨西哥东部和德克萨斯州西部的降雨量增加。第一个主要的水汽脉冲在7月13日左右与强烈的加利福尼亚湾有关。
Abstract The 2004 North American Monsoon Experiment (NAME) provided an unprecedented observing network for studying the structure and evolution of the North American monsoon. This paper focuses on multiscale characteristics of the flow during NAME from the large scale to the mesoscale using atmospheric sounding data from the enhanced observing network. The onset of the 2004 summer monsoon over the NAME region accompanied the typical northward shift of the upper-level anticyclone or monsoon high over northern Mexico into the southwestern United States, but in 2004 this shift occurred slightly later than normal and the monsoon high did not extend as far north as usual. Consequently, precipitation over the southwestern United States was slightly below normal, although increased troughiness over the Great Plains contributed to increased rainfall over eastern New Mexico and western Texas. The first major pulse of moisture into the Southwest occurred around 13 July in association with a strong Gulf of Californi...