Is it true? The tropics of Cancer/Capricorn’s summers are often much hotter than the equator?
But The tropics of Cancer/Capricorn’s winters are often far much colder than the equator?
- 1 month ago
Sometimes when you're crowning and you just have to take a huge and smelly dump.
- Atarah DerekLv 72 months ago
The Tropics of Cancer and Capricorn are defined as the highest and lowest (respectively) latitudes at which the sun can be right overhead, or at its zenith. When the sun is at its zenith, heat from sunlight is also at its most intense. This is why the summer solstice is hotter at the Tropics than it is at the equator. The equator's hottest days actually come on the equinoxes, when the sun is at its zenith twice a year.
As it so happens, the Tropics also correspond relatively closely to the boundary between the Hadley and Ferrel cells in the atmosphere.* Air at this boundary is mostly sinking, creating high pressure regions with little wind. These are known as the horse latitudes, due to unfortunate things that happened to horses when their owners were stranded in these regions--especially at sea--for too long. Because of these two factors, the world's hottest deserts are located along the Tropics.
*On a planet that has an atmosphere and is rotating at less than half the speed of earth (but is not tidally locked), air rises at the equator and doesn't sink again until it reaches the poles. This creates two bands, or cells, of moving air. On a planet rotating half to twice the speed of the earth, the two cells break up into three per hemisphere. Air that rises at the equator sinks again at about 30° north and south. This is called the Hadley cell in each hemisphere. Air begins to rise again at 60°, marking the most pole-ward boundary of the Ferrel cell. The polar cell, of course, extends from 60° to 90°, where air begins to sink again.On cell boundaries where the air is sinking, high pressure dominates, and low pressure systems that bring precipitation are uncommon. On cell boundaries where the air is rising, the pressure is lower, and precipitation is more common. This is why the Arctic and Antarctic Circles tend to see more snowfall than the poles themselves, as, like the Tropics, they just so happen to lie close to cell boundaries (though, to be fair, the Antarctic Circle never crosses land, so it's wetter by default).
- RonLv 72 months ago
I had not heard this, but I would consider that the equatorial region is more often shrouded in clouds because of the humid rising air. Latitudes between the tropics and 30 deg more often have clear skies (which facilitates rapid heating and cooling). Continental position might also play a role because land masses heat and cool more than seawater.
- Anonymous2 months ago
wrong forum. belongs in Earth Sciences & Geology
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- oikoσLv 72 months ago
Look at a map of world biomes. You will see that there are bands of deserts near the Tropics. The reason is that the insolation is greatest at the equator, causing hot air to rise. As it rises, it loses heat and can hold less water. The water falls as rain. This air sinks again near the Tropics. Being dry, it gains heat faster than it lost it when it rose. (You get the same thing with a foehn or Chinook.) That dries out the ground causing deserts. The thing about dry deserts (like the temperature changes in wet vs dry air) is that they get hotter during the day than wetter areas and lose heat faster at night, so you get both hotter high temperatures and colder low ones.
- StarryskyLv 72 months ago
Only in South America and Africa is the equator over land. There it can be hot in spring, summer and fall of either hemispheres' seasons. Rest of the middle of Earth is oceans and seas. The cooling or warming by the water will moderate temperatures.
The ratio of land to water is different on the Tropic lines. More extreme temperatures there.
- 2 months ago
Well.. I've been on the Tropic of Cancer on June 21st, and... it was hot, but not *much* hotter than the equator. And both were very humid.
Both lines actually *define* the 'tropics', where - at sea level or close to it anyway - it's usually pretty warm.
Exceptions that I can think of - Quito, Ecuador... It's very high in the mountains - and can be quite chilly, even though the equator runs through the city.