Consider the following statements regarding Earth 39 s Heat Budget 1 The amount of Heat energy that ...........

Geography and Environment (CSC) World climates

Consider the following statements regarding Earth's Heat Budget:

1. The amount of Heat energy that Earth radiates back into space is greater than the amount of heat energy it absorbs from the Sun.

2. The sun emits the heat in short-wave radiation and the earth emits back in longwave radiation.

3. The amount of energy that is reflected known as the Earth's albedo is about 30%.

Which of the statements given above are correct?

1 and 2 only

2 and 3 only

1 and 3 only

1, 2, and 3

2 and 3 only

Almost 60 per cent of the incident solar radiation (185 watts per square metre) actually reaches the Earth's surface. Of this around 13 per cent (24 watts per square metre) is reflected directly back into space.
Sunlight, shortwave radiation, passes through the atmosphere. Earth's surface and atmosphere absorbs solar radiation and re-radiates it as longwave radiation. We feel this longwave radiation as heat.
The average albedo of the Earth is approximately 0.30, meaning the Earth reflects about30% of the light (all wavelengths) that impinge on it.