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"Changes and Distribution of Precipitation" Weather and Climate PPT Courseware 5
Review and practice
Temperature distribution pattern
Latitude distribution law: gradually decreasing from the equator to the poles
Distribution pattern of sea and land: in areas with the same latitude, the inland temperature is high in summer and the coastal temperature is low; the inland temperature is low in winter and the coastal temperature is high; the annual temperature range in coastal areas is small while the annual temperature range in inland areas is large;
Topographic factors: In mountainous areas, temperatures decrease with increasing altitude.
Regarding the statement about isotherms, the correct statement is (A)
A. An isotherm is a line connecting points on a map with the same temperature.
B. On the same isotherm, the temperature at each point is different.
C. A small isotherm value indicates a high temperature
D. A large isotherm value indicates a low temperature
The basic factors affecting global temperature distribution are (C)
A.Sea and land location B.Ocean current factors
C.Latitude position D.Topographic factors
learning target
Knowledge goal
1. Understand the concept of precipitation, know common forms of precipitation, and different levels of precipitation. Understand the impact of precipitation on human production and life. Learn how precipitation is measured.
2. Learn to use precipitation data, draw precipitation histograms, and describe the changes in precipitation over time.
3. Preliminarily learn to read the world's annual precipitation distribution map and summarize the world's precipitation distribution patterns.
moral education goals
Care about weather and climate, understand the relationship between climate and production and life, love life and love learning.
1. The concept of precipitation
1. ___, ___, ___, etc. that fall from the atmosphere are collectively called precipitation.
2.___ is the main form of precipitation.
According to the amount of rainfall per unit time, the meteorological department divides rainfall into different levels such as ___, ___, ___, ___.
3. The basic instrument for measuring precipitation is ___, and the unit is ___.
Measurement of precipitation
Instruments for measuring precipitation: rain gauges and measuring cups.
Measurement method: See reading materials on page 58
Unit of precipitation: millimeters.
2. Changes in precipitation
1. The seasonal changes in precipitation are usually represented by a _______ diagram.
2. Types of seasonal changes in precipitation: A________B__________ C________D________E_________
1. Draw a histogram of precipitation (competition, who can draw faster and better?)
Based on the multi-year average monthly precipitation data of a certain place in the Northern Hemisphere, a histogram of monthly precipitation in that place is completed.
2. Interpretation of precipitation histograms
1. In which months does the area have more precipitation?
May~October (half summer)
2. In which months does the area have less precipitation?
November ~ April of the following year (winter half of the year)
3. Summarize the seasonal variation characteristics of precipitation in this place?
rainy summer
Distribution of annual precipitation in the world
1. What is the difference in annual precipitation between the equatorial and polar regions?
There is more precipitation near the equator; there is less precipitation in the polar regions.
2. What is the difference in annual precipitation between the east and west coasts of the continent on both sides of the Tropic of Cancer?
On both sides of the Tropic of Cancer, the west coast of the mainland has less precipitation, while the east coast of the mainland has more precipitation.
3. What are the differences in annual precipitation in mid-latitudes from coastal to inland?
Mid-latitude coastal areas have more precipitation and inland areas have less precipitation.
Expand applications
Annual precipitation is obtained by adding the monthly precipitation within a year.
The annual precipitation usually refers to the average precipitation over many years.
The monthly precipitation is calculated by adding the daily precipitation in a month.
Factors that affect precipitation include: latitude, land and sea, and topography.
Self-test in class
1. ____, ____, ____, etc. that fall from the atmosphere are collectively called precipitation. The main form of precipitation is ____.
2. Based on the amount of rainfall per unit time, the meteorological department divides rainfall into different levels such as ____, ____, ____, and ____. And match the corresponding symbols under the level.
3. The basic instrument for measuring precipitation is ______, and the unit used is ______.
4. In a region, the monthly precipitation in a year is ______. The seasonal changes in precipitation in an area within a year are usually represented by a ____________ diagram.
5. Around the world, some places have ____ precipitation, and some places have ____ precipitation. A _____________ diagram is usually used to represent the distribution of precipitation.
Complete the "Activity" question on P56 of the textbook.
1. How many millimeters of annual precipitation is there near the equator?
About 2000 mm or more
2. How does precipitation change from the equator to the poles?
From the equator to the poles, annual precipitation gradually decreases
3. What are the characteristics of precipitation on the east and west coasts of the mainland near the Tropic of Cancer?
There is more precipitation on the east coast of the mainland and less precipitation on the west coast.
4. Is the annual precipitation the same in the interior of the continent and along the coast in the temperate zone?
Differently, there is less precipitation in the interior of the continent and more precipitation in the coastal areas.
5. Find the areas with the most and least rainfall in the world?
Rainy pole: Cherrapunji; Dry pole: Atacama Desert.
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