Teaching plan of common weather system in geography of senior one.

# Gao Yi # Introduction When small thoughts become an act, they can become a habit; Thereby forming a character, and character determines the success or failure of your life. Sometimes the distance between success and failure is short-as long as the latter takes a few steps forward. Connett High School Channel has compiled the teaching plan of common weather system in geography for students in Grade One, hoping to help you!

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This section aims to answer two questions raised in the introduction of this unit: "What are the common weather systems" and "What are the hazards of meteorological disasters to people's production and life"; It is also based on the theory of "atmospheric movement caused by uneven cold and heat" in the first section and the concrete analysis of common weather systems in various regions under the framework of global atmospheric movement in the second section "pressure zone and wind zone", and completes the previous knowledge, such as high pressure, low pressure, polar front, etc. In addition, mastering this part will enable students to apply what they have learned about the earth's atmosphere and analyze the ever-changing weather phenomena.

Teaching objectives

I. Knowledge and skills

Knowledge requirements:

1. Master the concepts of air mass, front, front and front, and understand the classification of air mass and front.

2. Master the weather change characteristics of different fronts, different areas under the control of the same front and the same area under the control of the same front at different times.

3. Understand the relationship between low pressure, high pressure, cyclone and anticyclone and their influence on weather change.

Skills training:

1. Train students to analyze and explain the relationship between frontal system, cyclone and anticyclone system and weather from the perspective of movement.

2. Explain the activity characteristics of the weather system and its weather changes with simple weather charts.

Second, the process and methods

1. Introduce the types of main weather systems in combination with recent weather changes.

2.Flash courseware demonstrates the formation of front, the movement and change process of cold front, warm front and quasi-static front, and grasps the related components of front and the influence of its movement and change on weather from a dynamic point of view.

3. Read Figure 2.2 1, "The Distribution of World Sea Level Pressure on June 14, 2003 12", and demonstrate and master the concepts of high pressure (anticyclone), low pressure (cyclone), high pressure ridge and trough from the dynamic point of view.

Third, emotional attitudes and values

1, so that students can correctly understand the occurrence and change of weather phenomena, establish the dialectical materialism thought that the material world is constantly moving and changing, and things are interrelated and influence each other, and clarify the importance of scientific monitoring and forecasting.

2. Make students understand that geographical knowledge is close at hand, learn useful geographical knowledge, and apply it to practice to guide life.

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[Introduction to New Lessons]

Play the recent weather forecast of Jiangsu Province (reference: 165438+2004 1 October1) to remind students of the weather phenomena such as cloudy, sunny, windy and rainy in Jiangsu Province. Jiangyin was chosen as the reference location, and the changes of weather phenomena in Jiangyin under the influence of cold air were concerned. Introducing air mass with perceptual knowledge of cold and warm air.

[Guiding inquiry, discussion and communication]

Flash courseware demonstrates the formation of the front. On this basis, the question is raised: what is the main component of the front? Combined with the formation of front in Figure 2. 18, students should be guided to observe the movement of cold and warm air and the formation of front from a dynamic point of view, in addition to mastering the terms of front, front, front and back, and comparing the temperature, humidity and pressure of air on both sides of front.

Flash courseware demonstrates cold front and its weather, warm front and its weather, quasi-static front and its weather, and guides students to observe the air mass movement, weather changes, cloud formation and rainfall process of each front. Combined with Figure 2. 19 cold front and its weather, Figure 2.20 warm front and its weather, the differences among cold front, warm front and quasi-static front are compared and summarized, and the moving direction of cold and warm air masses and the process before and after the front transit are mainly observed. Fill in the form after discussion:

frontal surface

Air mass movement

sign

Weather before crossing the border

Weather during transportation

Weather after crossing the border

typical

cold front

warm front

quasi-stationary front

Encourage students to contact life and communicate in many ways. The reference for communication is as follows:

frontal surface

Air mass movement

sign

Weather before crossing the border

Weather during transportation

Weather after crossing the border

typical

cold front

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

Warm air mass control, sunny day.

Cloudy, rainy, windy and cool.

The cold air mass is controlled, the air pressure rises, the temperature and humidity drop sharply, and the weather is fine.

Cold wave, northern summer rainstorm, northern winter and spring gale sandstorm and so on.

warm front

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

Cold air mass control, sunny weather.

Cloudy and continuous precipitation

The heated air mass is controlled, the air pressure drops, the temperature and humidity rise, and the weather turns fine.

There are frequent warm fronts in the northeast and the middle and lower reaches of the Yangtze River.

quasi-stationary front

The cold and warm air masses are quite powerful.

very good

Persistent rainy weather

The weather turned fine, and the specific situation was affected by the controlled air mass after crossing the border.

"Meiyu"

[exchanging comments]

To break through this key and difficult point, we must grasp two key points of movement change: First, which initiative is the cold and warm air mass? The front formed by the active movement of cold air to warm air is a cold front, the front formed by the active movement of warm air to cold air is a warm front, and the front formed by the tug-of-war between cold and warm air masses is a quasi-static front. Second, there are obvious differences in air pressure, temperature, humidity and wind force on both sides of the front, so the front transit is often accompanied by clouds, rain, strong winds and other weather. As far as the cold front is concerned, the weather is sunny and warm before the cold front crosses the border, and there are cooling, rainy and windy weather when crossing the border. After passing through the mirror, the temperature and humidity dropped sharply, the air pressure rose and the weather turned fine. Relationship between warm front, quasi-static front and weather.

[knowledge application]

Discuss in groups and complete P45 activities. From the general analysis process of front system activity, that is, to judge what front it is and how to move, we can understand its dynamic evolution process from front to weather.

[contact life]

Guide students to discover the activities of the central plane system in life and its influence on weather phenomena. Play the video clips of cold wave and plum rain, and combine the second case "Cold wave and its harm" to understand the influence of cold wave and plum rain on our daily production and life, and consolidate and expand the knowledge about the front.

[transfer]

In autumn and spring, we often hear the weather forecast that a cold wave is coming, which will bring disasters such as strong wind, cooling and freezing rain. In summer, we hear that typhoons are more likely to cause strong winds and heavy rains.

Broadcast the video data of Typhoon No.9 "Mai Sha" which landed in Zhejiang on August 6th, 2005, and introduce the low pressure (cyclone) and high pressure (anticyclone).

[Introduction picture]

Read Figure 2.2114 World Sea Level Pressure Distribution, 2003 12 to master the concepts of low pressure (cyclone), high pressure (anticyclone), high pressure ridge and low pressure trough, and make it clear that low pressure and high pressure refer to pressure distribution, while cyclone and anticyclone refer to airflow.

[Guiding inquiry, discussion and communication]

Flash courseware demonstrates the formation, development and movement changes of low pressure (cyclone) and high pressure (anticyclone), and guides students to observe and compare the development and changes of airflow movement in different hemispheres and different air pressure systems in horizontal and vertical directions. Combined with Figure 2.22 Cyclone and Weather and Figure 2.23 Anticyclone and Weather, complete the table:

system

Air pressure condition

Near-surface airflow condition

Differences between the Northern Hemisphere and the Southern Hemisphere

Central airflow

weather regime

hurricane

anticyclone

Encourage students to communicate from a comprehensive and dynamic perspective, and pay attention to the difference of airflow and pressure between near ground and high altitude. The communication reference is as follows:

system

Air pressure condition

Near-surface airflow condition

Differences between the Northern Hemisphere and the Southern Hemisphere

Central airflow

weather regime

hurricane

be lax

centre

Gather from all directions to the center

The northern hemisphere rotates counterclockwise

The southern hemisphere rotates clockwise

rise

rainy season

anticyclone

high atmospheric pressure

centre

Divergent from the center to all directions

The northern hemisphere rotates clockwise.

The southern hemisphere rotates counterclockwise

water channel

It's sunny.

[exchanging comments]

The key to understand the horizontal movement of low-pressure (cyclone) and high-pressure (anticyclone) airflow near the surface is to judge the pressure gradient force, geostrophic force and friction force in the hemisphere according to the pressure condition of the pressure center, and determine the direction of airflow movement according to the * * * interaction of the three. In addition, it should be pointed out that the high-altitude airflow is not affected by friction, and the final flow direction is a rotary motion parallel to the isobar.

The key to understand the weather characteristics of low pressure (cyclone) and high pressure (anticyclone) vertically is the relationship between the vertical movement of airflow and temperature: the air in the low pressure center rises, the temperature drops, and the water vapor is easy to condense, forming clouds and causing rainfall; The air flow in the high-pressure center sinks, the temperature rises, the water vapor is not easy to condense, and the weather is fine.

[knowledge application]

Discuss in groups and complete P47 activities. Guide students to analyze problems comprehensively, give full play to them, scientifically evaluate the answers given by students, and encourage students to summarize from many angles in life.

[contact life]

Play back the video data of No.9 typhoon "Mai Sha" that landed in Zhejiang on August 6th, 2005, read Figure 2.24 typhoon structure according to case 2 "Typhoon and its harm", consolidate and expand the related knowledge of cyclones, understand the great destructive power of typhoons, and clarify the importance of scientific monitoring and forecasting.