The observation areas of the field campaign are designed at three levels of scale, i.e., the synoptic-, meso-, and cloud-convective-scales. The synoptic-scale observing network covers Guangdong, Guangxi, Hainan, most part of Fujian, the southern part of Jiangxi, Hunan and Guizhou, as well as Hong Kong and the adjacent oceanic areas (Fig. 5). The major observation area (also called “the mesoscale observing area”) includes Guangdong and the adjacent oceanic regions as well as eastern Guangxi (Figs. 5 and Fig. 6). The underlying conditions over the mesoscale observation area are very complicated (Fig. 1 and Fig. 3d): Guangdong is adjacent to northern South China Sea with complicated land topography lower in the southern side and higher in the northern side; mountains such as Yunwu, Lianhua, Qingyun, Huashi are scattered in this area; the Pearl River Delta city group is located in the central plain area of Guangdong. Thus, this observation area is a natural experimental base to carry out research on the southwest monsoon, land and sea breeze, mountain-valley winds and urban influences. Within the meso-scale observation area, there are two cloud-convective-scale observation areas.
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