This picture is a schematic diagram of the weather system (pressure value P1>P2>P3). Read the picture to answer the following questions. Question 1: This weather system is A. northern hemisphere cyclone

Title 1: A

Title 2: B

Title 3: D

Test question analysis:

Small question 1: The air pressure value P1>P2>P3, if the center of the air pressure is judged to be low pressure, then it is a cyclone in terms of the air flow movement; according to ① The three force and wind direction arrows, the wind direction crosses the isobars diagonally, from high pressure to low pressure, are judged to be arrows d, so the wind direction is judged to be to the right, indicating the northern hemisphere; the front legend at A is a cold front.

Quick question 2: Illustrations ② are located around the center of the cyclone. It is judged that updrafts prevail in the vertical direction. A is wrong. Illustrations ③ and 4 are located on the side of the cold air mass of the front, which is a rain area. B is correct. Because the diagram shows The frontal cyclone is in the northern hemisphere, so place ① should be controlled by warm air masses, while place ② is controlled by cold air masses, error C; isobars in place 2 are denser than those in place 1, so the wind is judged to be stronger than place 1, error D.

Quick question 3: According to the stress condition of the horizontal movement of the ground air in the diagram ①, the horizontal pressure gradient force is perpendicular to the isobars, pointing from high pressure to low pressure, which is judged as arrow c; a is related to the wind direction and friction force Vertical, judged to be the geostrophic deflection force; wind direction diagonally across the isobars, from high pressure to low pressure, judged to be the d arrow.

Comments: This question is of average difficulty and is a basic question. Students should strengthen the implementation of basic knowledge points and the training of the ability to read pictures in their daily study. The key to solving the problem is to be able to learn from the diagrams. Isobar distribution determines airflow conditions, weather characteristics, wind direction and three forces, etc.