Geographical environment of Lianjiang county

Mazu Islands is a granite cone-shaped island in geological conditions, with large ups and downs and steep terrain. The cliff of Beigan Island is 294 meters above sea level, which is the highest peak of Mazu Islands. The first peak in Nangan is Yuntai Mountain, which is 248 meters high and has been listed as one of Xiaobai Mountains in Taiwan Province Province.

There are many valleys and bays, and granite rocks in coastal areas are weathered by waves, with many cliffs, dangerous reefs, sea caves and sea gates. Some bays and bays are alluvial and piled up to form beaches, gravel beaches and pebble beaches. There are only four townships in the county, but there is no beach in Dongyin. Mazu has a subtropical maritime climate with four distinct seasons, cold and humid winter, foggy exchanges in spring and summer, and generally stable weather in autumn. The latitude of Mazu is slightly higher than the northern part of Taiwan Province Province (about one degree), but due to the continental climate close to Chinese mainland, the temperature is lower than that of Taibei, with an annual average temperature of 18.6 degrees Celsius, and the temperature difference between morning and evening is large. The annual temperature is the lowest in February and February, and gradually rises after March. The highest temperature is in July and August, and the monthly average temperature is about 29 degrees, then it gradually decreases, and the lowest monthly average temperature in February is only about 10 degrees.

The wind speed is the highest from May 438+00 in June to March of the following year, when the continental cold air mass moves southward and a strong northeast monsoon blows. Especially from March to May, southerly winds began to blow, forming foggy weather. This is the famous advection fog. Every spring, the south wind brings warm and humid air from the Taiwan Province Strait, which contacts with the lower temperature of Mazu ground and water, forming dense fog. The thickness of advection fog can reach more than seven or eight hundred meters, and the solar radiation during the day with good weather can only eliminate the cloud top at most, so; If advection fog lasts for a long time, the visibility will plummet, which is also the reason why flights in Mazu area often stop this season.