There are six in total, the polar easterly belt, the mid-latitude westerly belt and the northeast (south) trade wind belt, which are similar in the northern and southern hemispheres.
The main cause is three circles of circulation, namely: 0~30--low latitude circulation; 30~60--mid-latitude circulation; 60~90--high latitude circulation. After simplification (it is considered that the atmosphere moves on a uniform ground), three circulations of the atmosphere are generated under the action of the pressure gradient force, forming the equatorial low pressure zone, the subtropical high pressure zone, the subpolar low pressure zone and the polar high pressure zone. Under the action of the geostrophic deflection force (to the right in the northern hemisphere and to the left in the southern hemisphere), the northeasterly wind near the surface at 0 to 30 degrees is the northeast trade wind. In the same way, the remaining wind belts are generated. At the same time, under the influence of thermal differences in sea routes and topographic factors, a high (low) pressure center like the Siberian High is formed. With seasonal changes, monsoon circulation appears (the seasonal position movement of the pressure belt and wind belt is also one of the causes).
Please briefly explain the five major risks in your work and study
If the blades do not move, all the voltage originally applied to the motor engine will be applied to the coil of the electric fan, and the voltage will be too high. , the calorific value will also be greatly increased than before, that is, all the mechanical energy of the original rotation of the fan has been turned into heat energy. So there is a risk of overheating and catching fire.
Hope to adopt it, O(∩_∩)OThank you
Briefly explain the process of formation of Tanniang Sand Dunes
1. Busy with work or study, no time to accompany Family members will destroy the relationship between family members
2. Being busy with work will ignore physical health
3. Being caught up at any time and being stressed out
4. Work There is a risk of being fired
5. If you study incorrectly, you will get worse as you learn
Every winter and spring season (October to March of the following year), the climate Drought and windy. There is sparse vegetation in the area where the strong wind passes, and when it passes through the river, it is less blocked, forming a vortex of updrafts that carry sand from sandbanks and river beaches. Blocked by the mountainous terrain along the river, the wind speed slows down and sand accumulates on the hillside over time, forming sand dunes.
Danniang Sand Dune is located in Danniang Township, Milin County, Tibet, 90 kilometers away from the confluence of the two rivers. It is the largest sand dune in the center of the Yarlung Zangbo River.
Extended information
Because the Himalayas and Nyenchen Tanglha Mountains extend parallel from west to east, the east is connected with the Hengduan Mountains. A large gap opens up in the southeastern low point facing the Indian Ocean. The Indian Ocean warm current and the northern cold current flowing up the river converge and stay in the eastern section of the Nyenchen Tanglha Mountains, resulting in the coexistence of tropical, subtropical, temperate and frigid climates. climate zone.
The warm currents from the two oceans flow in all year round, forming a special tropical humid and semi-humid climate here, with an annual rainfall of about 650 mm.
The best season to view Tanniang Sand Dunes is winter and spring. In winter and spring, the water potential of the Brahmaputra River slows down, and large areas of the river bed are exposed. The wind force is strong and the wind sedimentation effect is more obvious.During the rainy season, the exposed area of the sand dunes is smaller, but when combined with the blue Brahmaputra River, the snow-capped mountains in the distance, the nearby steep mountains, and the blue sky and white clouds, it still creates a beautiful picture.