"Climate Characteristics and Major Meteorological Disasters in my country" PPT courseware

"Climate Characteristics and Major Meteorological Disasters in my country" PPT courseware

Part 1: What is a cold wave?

It refers to the cold air from high latitudes that rapidly intensifies under specific weather conditions and invades mid- and low-latitudes, causing severe cooling, strong winds, rain and snow in areas along the way. This kind of cold air that reaches a certain level when it invades south is called a cold wave.

Standard: Our country’s meteorological department stipulates that if the cooling caused by the intrusion of cold air reaches more than 10 degrees Celsius in a day, and the minimum temperature is below 5 degrees Celsius, this cold air outbreak process is called a cold wave process.

Because the temperature in the Arctic and Siberia is very low, the density of the atmosphere will greatly increase. The air will continue to shrink and sink, causing the air pressure to increase. In this way, a powerful, deep and wide cold high-pressure air mass will be formed. When this cold high-pressure force strengthens to a certain extent, it will be like a tidal wave that has burst a dike, rushing thousands of miles and hitting China with surging force. This is a cold wave.

my country's climate characteristics and major meteorological disasters PPT, part 2: How are typhoons formed?

Refers to tropical cyclones that form on the vast sea surface above 26°C in the tropics or subtropics.

Tropical depression, maximum wind speed of level 6-7,

Tropical storm, maximum wind speed of level 8 to 9,

Severe tropical storm, maximum wind speed of 10 to 11 levels,

Typhoon, maximum wind speed of 12 to 13 levels,

Strong typhoon, maximum wind speed of 14 to 15 levels

Super typhoon, maximum wind speed ≥16

Northern Hemisphere: 5 sea areas: the western and eastern North Pacific, the western North Atlantic, the Bay of Bengal and the Arabian Sea.

Southern Hemisphere: 3 sea areas: the western South Pacific, the western and eastern South Indian Ocean.

Benefits of typhoon:

1. Typhoons bring abundant fresh water to people.

2. Second, tropical and subtropical areas near the equator receive the longest sunshine hours and are unbearably dry and hot. If there are no typhoons to dissipate the heat in these areas, it will be even hotter and the surface sand desert will be more serious.

3. Third, the maximum speed of a typhoon can reach more than 200 kilometers per hour, causing destruction wherever it goes. With this huge flow of energy, the earth maintains thermal balance.

4. Fourth, typhoons can also increase fishing output. Whenever a typhoon hits, the rivers and seas are turned upside down, and the nutrients at the bottom of the rivers and seas are swept up. The bait increases, attracting fish to gather near the water surface, and the catch naturally increases.

PPT on my country’s climate characteristics and major meteorological disasters, part three: floods

Causes of floods:

Human activities such as excessive deforestation and overgrazing can also cause floods. In 1998, a catastrophic flood occurred in the Yangtze River Basin that had not been seen in a century.

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"Climate Characteristics and Major Meteorological Disasters in my country" PPT:

"my country's Climatic Characteristics and Main Meteorological Disasters" PPT Part One: Monsoon climate in eastern China: 1. my country's monsoon climate distribution range: the area east and south of the Daxinganling-Yinshan-Helan Mountain-Gangdise Mountains line 2. my country's climate types are: Tropical monsoon...