(12) Read the "Northern Hemisphere Surface Weather System Map (hPa)" and answer the following questions. (1) According to the air pressure, ① the ground is

(1) high pressure and low pressure

(12) Read the "Northern Hemisphere Surface Weather System Map (hPa)" and answer the following questions. (1) According to the air pressure, ① the ground is

(1) high pressure and low pressure

(2) Northwest (North)

(3) After the cold front with low temperature and fine weather passes, the ridge of high pressure is controlled.

(4) Affected by cold front activities, it will experience a gale, rain and snow cooling weather (2 points per air, 12 points * * *).

Test analysis:

(1) Cyclone and anticyclone describe the airflow condition of weather system, while low pressure and high pressure describe the pressure condition of weather system. In fact, cyclone is a low-pressure system and anticyclone is a high-pressure system. (1) the center of the earth is high pressure, which is the center of high pressure; ③ The center of the earth is low pressure, which is the center of low pressure.

(2) This question examines the formation of wind direction. The horizontal movement of the atmosphere is called wind, and the direct cause of wind is the horizontal pressure gradient force, which is perpendicular to the isobar and points to the low pressure. At high altitude, the wind direction is only affected by the horizontal pressure gradient force and geostrophic deflection force, while near the ground, the wind direction is also affected by friction. The geostrophic force in the northern hemisphere moves to the right, so the northwest wind finally blows.

(3) This question examines common weather systems and weather. ④ The land is controlled by high pressure ridge. After the cold front crosses the border, the weather is clear and the temperature is low near the ridge line of high pressure and after the cold front crosses the border.

(4) This topic examines the frontal system and weather. (5) At the moment, the ground is controlled by the warm air mass and will also be affected by the cold front, so the weather is perineum, wind, rain and snow. After crossing the border, the weather turned fine, the temperature dropped and the air pressure increased.

Comments: Cold Front, Warm Front and Weather

?

cold front

warm front

Quasi-static front and weather

chart

?

sign

?

concept

The cold air mass actively moves to the warm air mass.

The warm air mass actively moves to the cold air mass.

Quasi-static front refers to a front with a small moving range.

Weather characteristics

Before crossing the border

Single air mass control, sunny day

Single air mass control, low temperature and sunny days

The cold and warm air masses are evenly matched, or blocked by the terrain, the front moves slowly, or swings in an area for a long time, resulting in rainy weather.

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