Why does the East China Sea receive cold, dry air during winter?

The East China Sea receives cold, dry air during the winter due to the monsoon wind system, which is driven by the extreme temperature differences between the Asian landmass and the surrounding oceans.1

During the winter months, the Asian continent undergoes intense cooling, particularly over the Plateau of Tibet and Siberia. This chilling effect leads to the development of a persistent, high-pressure anticyclone over the interior of the continent. This high-pressure system forces cold, dry air to flow eastward and southward out of the continent and across the East China Sea. Consequently, the prevailing winter winds in the region blow from the north, bringing these continental air masses over the sea.2134