อนุทิน 173852

Climate Change - Human Activities

It should not be a surprise to see maps of areas affected by severe heatwaves (said to be caused by ‘hot’ high pressure weather cells at about 3-5 km above sea level) match well with air (passenger jets) traffic density. But passenger jets cruise (most of the time) at about 10km. Jets burn a lot of fuel and generate a lot of heat. (Internet search should supply the numbers for wasted heat, but how the heat from 10 km comes down to 3-5 km – air is less dense at higher altitude; heat transfers more to denser air –so heat sinks in atmosphere). ##a fair bit of work needed to clear questions here.

** Rockets are also very big heat engines.

And likewise the sea surface temperature maps match well with shipping traffic maps. Cargo ships burn a lot of oil and generate a lot heat. Most modern ship engines have 2 engine cooling systems (one is a closed system that cools the engine itself –like in cars; the other uses seawater to cool the closed system and releases the hot seawater back to the sea). ##Numbers can be estimated.

The big question is on heat generated by motorcars and other machinery on land. Can we get some data or bases for estimating ‘car heat maps’?

Can we take anymore of these heat engines?