in fog-prone area
west sea / east sea / jeju
Hypothesis
There will be a lot of advection fog in the summer.
the point we investigated
In the West Sea, East Sea, and Jeju, warm advection is formed under the influence of low pressure or trough, and advection fog is formed by cooling as the warm air moves over the cold sea level. The frequency of fogging will increase during the summer, when the air temperature rises sharply compared to the sea level.
Regional topography and climate
Ongjin
Ongjin includes 5 islands in the West Sea and several islands around Gyeonggi Bay, and is a representative maritime climate. Due to the influence of the sea, the climate is mild. The average temperature in the coldest month is -1.7℃, the average temperature in the worst month is 25.7℃, the average annual temperature is 11.7℃, and the annual average precipitation is 1,090mm.
Ulleungdo
Ulleungdo is the largest manned island in the East Sea of Korea, and is a volcanic island formed by hardening lava rising from about 2000m below the sea floor, and consists of a total of 44 islands. In addition, Ulleungdo is a pentagonal, triangular-shaped island with a rugged mountain range of 200 to 400m from Seonginbong to the shoreline. The annual average temperature is 12.4℃, the annual average precipitation is 1383.4mm, and the annual average wind speed is 3.7 m/s.
Heuksando
Heuksando is an island and belongs to the temperate coastal climate zone. In summer, fog occurs frequently due to the hot and humid southwest wind, especially with an average humidity of over 80%. In winter, it is cold and dry under the influence of cold Siberian high pressure, and the wind is strong. The annual average temperature is 13.3℃, the maximum temperature is 16.2℃, and the minimum temperature is 11.5℃. The annual average precipitation is 1107.2mm, which is 200~650mm less than that of the west and south coasts.
jeju
Jeju island is the largest island in Korea formed by volcanoes, and the coastline is relatively simple, and the ridgeline is formed long in the long axis direction, but it is not steep, so it is generally round. It is affected by the Kuroshio Warm Current, which is a tributary of warm equatorial currents flowing from the southwest throughout the year, and is not directly affected by the North Korean Current or the cold coastal currents of the Yellow Sea in winter.