Why does the northeast wind prevail in Guangzhou instead of the northwest wind?

Because most of the cold air comes from Siberia and enters China through the Mongolian Plateau in winter, the northwest wind mainly blows in the north. When the cold air reaches the south, it is weakened because of the barrier between Yunnan-Guizhou Plateau and Nanling Mountains, but it mainly enters Guangdong Province from Jiangxi Province, and it is northeast in Guangzhou, so the northeast wind mainly blows in Guangzhou in winter, and then it is related to the ocean circulation. In winter, in the northwest Pacific Ocean, the cold ocean current mainly reaches the Sea of Japan-the Yellow Sea-the East China Sea-the Taiwan Province Strait-the South China Sea from the Kuril Islands, which makes Guangdong Province blow northward mainly from the northeast wind.