Why the coldest hour of the day is when the sun is rising?

Question

I've noticed that in the morning, when the sun appears the temperature is coldest.

A friend of mine explains that, at that hour, the lower level of the atmosfphere (that is close to the earth) is some degrees upper than the earth in the floor level and several meters down (except in the case of a land where are volcanos, of course). In that thermical scenario, the heat of the first sun rays is rapidly absorbed by the earth (the coldest focus) with the consecuence of a loss of temperature at the floor level.

How do you evaluate this answer folks?

Answer 1

During the first hour or so, the incoming solar energy does not yet have enough strength to reverse the heat loss from radiation. (A similar condition arises later when solar energy becomes too weak to balance the heat loss in the hours before sunset.) As a result, the surface and lower atmosphere air are still losing heat for some time following sunrise and thus the coldest temperature of the day has yet to be reached. A general rule of thumb puts the time of coldest temperature about an hour after sunrise.

Answer 2

If the sky has been clear all night the temperature continues to drop due to radiation cooling. Heat energy in the ground radiates out to open space. Just as the sun rises there is much light but very little heat because of the low angle of the sun with the ground and the longer path the light must travel through the atmosphere. Therefore cooling continues until the sun is higher in the sky. Hold a cylindrical flashlight hip high and point is at the floor. The light is concentrated and the path is short (like at high noon). Now set the flashlight on the floor and notice how the light spreads out over a larger area (less concentrated) and the path to the nearest wall may be much longer (diffusing more light).

Answer 3

Heat doesn't transfer instantly, especially across such large distances.
The analogue to this is just when the sun sets. It's a lot warmer at sunset than sunrise, right? We've had a good 10-12 hours of exposure to the sun by then, and the heat takes some time to dissipate.

Answer 4

in case you've been on the Arctic Circle, you would see this take position on the wintry climate solstice in December. because the solar starts to flow northwards after the solstice, the variety at which this would nicely be considered strikes northwards also. ultimately, on the Vernal Equinox in March, the solar rises on the North Pole and continues to be above the horizon for 6 months, even as the phenomenon of the solar transforming into then as we communicate putting strikes to the Antarctic areas.

Answer 5

Sunrise is when it's been the most time since the sun was shining.

Answer 6

bcos that is when the sun's rays fall at an oblique angle on the earth

at noon sun's rays fall straight on the earth

Answer 7

Good question, I've notice that myself and wonder the same thing.

Answer 8

because the earth doing rotation

Answer 9

navigator is right on coarse