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Grade 8 / Middle 2 (age 13-14)

Sea Breeze & Monsoon

Sea Breeze and Monsoon

Wind blows because temperature differences make pressure differences, always from high toward low pressure. By day the land heats faster so a sea breeze runs from sea to land; by night the land cools faster so a land breeze runs the other way. Monsoons are the same idea at continent scale: in Korea, moist southeast winds in summer and dry northwest winds in winter. Here you can slide through the time of day and watch sea and land breezes switch.

Why Wind Blows
🌬️ Temperature Diff → Pressure Diff → Wind
①Warm spot: air rises → low pressure
②Cold spot: air sinks → high pressure
③Wind blows from high to low pressure
Sea Breeze & Land Breeze
0
🏖️ How Sea/Land Breezes Work
①Day: land heats faster → low pressure on land → sea→land (sea breeze)
②Night: land cools faster → low pressure at sea → land→sea (land breeze)
③Caused by specific heat difference: water > land
Monsoon
🗺️ Large-scale Sea/Land Breeze
①Summer: continent heats → ocean→continent (SE wind, humid)
②Winter: continent cools → continent→ocean (NW wind, dry)
③Same principle as sea/land breeze, on continental scale!
Summary
Wind Principle
High Pressure (cold) → Low Pressure (warm)
Temperature gap → pressure gap → wind
Sea/Land Breeze
Day: sea breeze (sea→land) / Night: land breeze (land→sea)
Driven by the specific heat difference between land and sea
🎯 Exam Points
①Wind: high → low pressure
②Day sea breeze (sea→land), night land breeze (land→sea)
③Cause: water has higher specific heat than land
④Summer monsoon: SE wind (wet), winter: NW wind (dry)
⑤Monsoon = continental-scale sea/land breeze
Examples and Unit Test
Example 1
At the coast, which way does the daytime wind (sea breeze) and the nighttime wind (land breeze) blow, and why?
1
By day the land heats faster than the sea, so the air over the land becomes low pressure and the wind blows from sea to land (sea breeze).
2
By night the land cools faster than the sea, so the air over the sea becomes low pressure and the wind blows from land to sea (land breeze).
▸ Day = sea breeze (sea → land), night = land breeze (land → sea) / due to the difference in specific heat between land and sea
Wind always blows from high to low pressure, and the difference in specific heat flips its direction.
Example 2
How do the direction and nature of the Korean summer and winter monsoons differ, and how are they related to sea and land breezes?
1
In summer the continent heats faster than the sea and becomes low pressure, so a southeast monsoon (hot and humid) blows from sea to continent.
2
In winter the continent cools fast and becomes high pressure, so a northwest monsoon (cold and dry) blows from continent to sea. This is the sea and land breeze scaled up to continent size.
▸ Summer = southeast wind (humid), winter = northwest wind (dry) / a continent-scale version of the sea and land breeze
Because both arise from a difference in specific heat, monsoons and sea or land breezes work on the same principle.
Unit Test
Which statement about sea breezes and monsoons is correct?
①Wind blows from low pressure to high pressure
②By day a land breeze blows from land to sea
③Sea and land breezes arise from the difference in specific heat between land and sea
④The Korean winter monsoon is a southeast wind
⑤Water has a smaller specific heat than land and warms up quickly
▸ ③ Sea and land breezes arise from the difference in specific heat between land and sea
1
Wind blows from high to low pressure (① wrong), and by day a sea breeze blows from sea to land (② wrong).
2
The Korean winter monsoon is a northwest wind (④ wrong), and water has a large specific heat so it warms slowly (⑤ wrong); sea and land breezes arise from the difference in specific heat between land and sea (③ correct).
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