Temperature and Pressure
So I read in a text book that the Poles tend to have higher pressure due to the colder air that sinks, and the equator tend to have lower pressure due to the hotter air that rises. Okay that part I understand.
Now, isn't it also that a hotter region with an expanded taller column of air will give you a higher pressure at sea level, compared to when it is not as hot (like during night time cooling)? Afterall, altimeter under-reads at higher temperature and we have to increase the altimeter setting, which means we are flying in a higher pressure region when we enter a higher temperature region.
So does hotter temperature produce lower or higher pressure?