Time change of wind speed in Fujian Province

Time change of wind speed in Fujian Province

The wind speed in the coastal areas of Fujian varies greatly with the region, and the contours are intensive; the inland regions vary little with the regions, and the contours are sparse. The climate in coastal areas is generally better than inland areas because seawater regulates the climate. For example, in the summer, the coastal areas have two more than the interior areas. In winter, the temperature drops slowly due to the large water ratio, making the temperature ratio in the coastal areas lower than inland areas. Inland high. Therefore, the coastal area belongs to the cool winter and cool summer areas. How did the wind speed in Fujian change with time? The wind speed can be measured by means of a wind anemometer.

The autumn and winter winds in the coastal areas are large, and the spring and summer monsoon is small: from the middle and late September, the average wind speed increases significantly. With the alternation of the seasons, the cold air forces in winter have been further strengthened, typhoon activity has been significantly reduced, and temperatures in the South China Sea have been high, air density is low, and air pressure is low. This is in stark contrast to the mainland. The wind speed can be predicted in advance by the wind direction wind speed monitor. At the same time, the winter season is often affected by the terrain troughs in Taiwan. The pressure gradient over the Taiwan Strait and the coastal areas of Fujian is very large, and the average wind speed also reaches its maximum value throughout the year. For example, the average wind speeds in Pingtan and Chongwu from October to February are all over 6.7 m/s, but the wind speed is greatly influenced by the terrain. At the same time, the wind speed in Ningde in the harbor is only below 1.2 m/s. . As the cold air forces weakened, the pressure gradients along the coast of Fujian and the Taiwan Strait decreased, and the average wind speed also decreased. In summer in Fujian under the control of a single air mass, the pressure gradient is smaller. In addition to the typhoon and other strong systems, or the transient gale during the onset of thunderstorms, the general wind is weak. Coastal and island-wide during the prevailing period of northeast monsoon, especially in November and February, the average wind speed is the largest; during the prevailing period of southwest monsoon, the wind speed is small, and there is often a phenomenon of calm. Hand-held weather stations are also scientific instruments frequently used in meteorological testing.

Inland areas have small wind speeds, and the changes in their phases are different: Fujian inland areas belong to the part of the Fujian-Zhejiang mountains and belong to the weak wind area. The wind speed changes little and the phase changes are not the same. The wind speeds of coastal counties in inland areas are obviously smaller than those in coastal areas, and the annual changes are not the same everywhere. For example, Fuding, Luoyuan, Lianjiang, Fu'an, Tongan, and Zhapu, the wind speed in summer and autumn is greater than winter In the spring, in the northeast of Yunnan, the mountainous area is 800 meters above sea level. The wind speed is the largest due to thundery showers in summer; the wind speeds of springs and summers in Qixian and Jiuxian are greater than in autumn and winter; the autumn and winter in Tingjiang are greater than those in spring and summer; the conditions in the northwestern margin It is more complicated, and appears in different places in winter, spring, summer, autumn and winter. The Lancang River valley is relatively large in spring and summer.