The assumption of constant relativehumidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelength.
相对湿度恒定的假设是重要的，因为大气中的水蒸气是红外波长辐射的另一种有效吸收剂。
2
Because warm air can hold more moisture than cool air, the relativehumidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.